Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.2/0.20

Health Effects: Liver/circulatory/nervous system problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.005/0.003

Health Effects: Kidney/liver/immune system problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.007/0.007

Health Effects: Liver problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.0002/0

Health Effects: Cancer risk; reproductive system problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.07/0.07

Health Effects: Adrenal gland problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.005/0

Health Effects: Cancer risk

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.005/0

Health Effects: Cancer risk

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.00000003/0

Health Effects: Cancer risk; reproductive system problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.05/0.05

Health Effects: Liver problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.07/0.07

Health Effects: Adrenal gland/liver/kidney problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): TT/0

Health Effects: Cancer risk; nervous system/blood problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.002/0

Health Effects: Cancer risk; eye/liver/kidney/spleen problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Secondary Standards

Category: Secondary Drinking Water Standards

Monitoring Requirements/Comments: National Secondary Drinking Water Standards are non-enforceable guidelines regulating contaminants that may cause cosmetic effects or aesthetic effects in drinking water. The EPA recommends secondary standards but does not require systems to comply with secondary MCLs. States may establish or enforce standards that differ from these recommendations.

Secondary MCL (mg/L unless noted): 0.05 to 0.2

Noticeable Effects Above Secondary MCL: Colored water

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

MCL/MCLG (mg/L unless noted): 0.006 / 0.006

Health Effects: Increase in blood cholesterol; decrease in blood sugar

Monitoring Requirements/Comments: Once a year for surface waters. Once every 3 years for ground water for IOCs, not including Asbestos, Lead and Copper, Nitrate, Nitrite and Radionuclides. Minimize monitoring costs by using historical data, waivers, susceptibility waivers, and/or making composite samples.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

Rule: Arsenic Rule

MCL/MCLG (mg/L unless noted): 0.010/0

Health Effects: Cancer risk; cardiovascular and dermal problems

Monitoring Requirements/Comments: Same as IOCs. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

MCL/MCLG (mg/L unless noted): 7 MFL/7MFL

Health Effects: Increased risk of developing benign intestinal polyps

Monitoring Requirements/Comments: Once every nine years.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.003/0.003

Health Effects: Cardio problems/reproductive system problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

MCL/MCLG (mg/L unless noted): 2/2

Health Effects: Increase in blood pressure

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.005/0

Health Effects: Cancer risk; anemia/blood problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.0002/0

Health Effects: Cancer risk; reproductive system problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

MCL/MCLG (mg/L unless noted): 0.004/0.004

Health Effects: Intestinal lesions

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

Rule: Radionuclides

MCL/MCLG (mg/L unless noted): 4 mrem/year / 0

Health Effects: Cancer risk

Monitoring Requirements/Comments: Primacy agency must designate vulnerable systems. Once deemed vulnerable, quarterly samples required for beta emitters and annual samples for Tritium and Strontium-90 at entry to distribution system. Compliance is based on the running annual average of four quarterly samples taken at each sample point.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 1 Disinfectants and Disinfection By-Products

MCL/MCLG (mg/L unless noted): 0.010/0

Health Effects: Cancer risk

Monitoring Requirements/Comments: One sample per month (ozone systems only). Compliance based on running annual average.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

MCL/MCLG (mg/L unless noted): 0.005/0.005

Health Effects: Kidney damage

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.04/0.04

Health Effects: Blood/nervous/reproductive system problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.005/0

Health Effects: Cancer risk; liver problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 1 Disinfectants and Disinfection By-Products

MCL/MCLG (mg/L unless noted): 4.0 (as Cl2) MRDL/4 MRDLG

Health Effects: Eye/nose irritation; stomach discomfort; anemia

Monitoring Requirements/Comments: Monitor at the same sample locations as the TCR. Compliance based on running annual arithmetic average of monthly averages. Daily sample at distribution system entry point.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.002/0

Health Effects: Cancer risk; liver/nervous system problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Secondary Standards

Category: Secondary Drinking Water Standards

Monitoring Requirements/Comments: National Secondary Drinking Water Standards are non-enforceable guidelines regulating contaminants that may cause cosmetic effects or aesthetic effects in drinking water. The EPA recommends secondary standards but does not require systems to comply with secondary MCLs. States may establish or enforce standards that differ from these recommendations.

Secondary MCL (mg/L unless noted): 250

Noticeable Effects Above Secondary MCL: Salty taste

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 1 Disinfectants and Disinfection By-Products

MCL/MCLG (mg/L unless noted): 4.0 (as Cl2) MRDL/4 MRDLG

Health Effects: Eye/nose irritation; stomach discomfort

Monitoring Requirements/Comments: Monitor at the same sample locations as the TCR. Compliance based on running annual arithmetic average of monthly averages. Daily sample at distribution system entry point.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 1 Disinfectants and Disinfection By-Products

MCL/MCLG (mg/L unless noted): 0.8 (as ClO2) MRDL / 0.8 MRDLG

Health Effects: Anemia; nervous system problems

Monitoring Requirements/Comments: Daily sample at distribution system entry points. Four quarterly distribution samples. Compliance based on running annual average of quarterly average.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 1 Disinfectants and Disinfection By-Products

MCL/MCLG (mg/L unless noted): 1.0/0.8

Health Effects: Anemia; nervous system problems

Monitoring Requirements/Comments: Daily sample at distribution system entry point.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.1/0.1

Health Effects: Kidney/liver problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

MCL/MCLG (mg/L unless noted): 0.1/0.1

Health Effects: Allergic dermatitis

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.07/0.07

Health Effects: Liver problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Secondary Standards

Category: Secondary Drinking Water Standards

Monitoring Requirements/Comments: National Secondary Drinking Water Standards are non-enforceable guidelines regulating contaminants that may cause cosmetic effects or aesthetic effects in drinking water. The EPA recommends secondary standards but does not require systems to comply with secondary MCLs. States may establish or enforce standards that differ from these recommendations.

Secondary MCL (mg/L unless noted): 15 (color units)

Noticeable Effects Above Secondary MCL: Visible tint

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

Rule: Radionuclides

MCL/MCLG (mg/L unless noted): 5 pCi/L / 0

Health Effects: Cancer risk

Monitoring Requirements/Comments: Sample point is the distribution system entry point that is representative of all sources being used. Four consecutive quarterly samples must be taken at all sample points. Rule applies to Community Water Systems only.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

MCL/MCLG (mg/L unless noted): TT (AL = 1.3) / 1.3

Health Effects: Gastrointestinal/liver/kidney problems

Monitoring Requirements/Comments: Copper: Same as Lead.

Status: Secondary Standards

Category: Secondary Drinking Water Standards

Monitoring Requirements/Comments: National Secondary Drinking Water Standards are non-enforceable guidelines regulating contaminants that may cause cosmetic effects or aesthetic effects in drinking water. The EPA recommends secondary standards but does not require systems to comply with secondary MCLs. States may establish or enforce standards that differ from these recommendations.

Secondary MCL (mg/L unless noted): 1

Noticeable Effects Above Secondary MCL: Metallic taste; blue-green staining

Status: Secondary Standards

Category: Secondary Drinking Water Standards

Monitoring Requirements/Comments: National Secondary Drinking Water Standards are non-enforceable guidelines regulating contaminants that may cause cosmetic effects or aesthetic effects in drinking water. The EPA recommends secondary standards but does not require systems to comply with secondary MCLs. States may establish or enforce standards that differ from these recommendations.

Secondary MCL (mg/L unless noted): Noncorrosive

Noticeable Effects Above Secondary MCL: Metallic taste; corroded pipes/ fixtures; staining

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Filter Backwash Rule

MCL/MCLG (mg/L unless noted): TT/0

Health Effects: Gastrointestinal illness; Cryptosporidiosis

Monitoring Requirements/Comments: No monitoring is required, but systems must collect and retain information on recycle flows for review by the primacy agency. Applies to all systems using conventional or direct filtration treatment that recycle spent filter backwash water (excluding membrane plants), thickener supernatant or liquids from dewatering processes. TT Requirement - All recycle flows must be returned at the head of the plant so that complete treatment of the recycle stream is provided. Treatment of recycle streams prior to recycle is not required.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Interim Enhanced Surface Water Treatment Rule (IESWTR)

MCL/MCLG (mg/L unless noted): TT/0

Health Effects: Gastrointestinal illness; Cryptosporidiosis

Monitoring Requirements/Comments: Applies to plants using surface water or ground water under the direct influence of surface water. Must continue to comply with SWTR. Treatment effectiveness is demonstrated by combined effluent turbidity = 0.3 NTU in 95% of measurements taken each month. Conventional and direct filtration systems must measure combined filter effluent turbidity at least every four hours and continuously monitor turbidity of each individual filter. The maximum turbidity limit is 1 NTU. If the PWS meets filtered water turbidity criteria, it is assumed to achieve the required 2-log Cryptosporidium removal. Performance triggers for individual filter turbidities lead to additional reporting and assessments if exceeded. IESWTR applies to systems = 10,000; LT1ESWTR applies to systems <10,000 people.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Long Term 1 Enhanced Surface Water Treatment Rule (LT1ESWTR)

MCL/MCLG (mg/L unless noted): TT/0

Health Effects: Gastrointestinal illness; Cryptosporidiosis

Monitoring Requirements/Comments: Applies to plants using surface water or ground water under the direct influence of surface water. Must continue to comply with SWTR. Treatment effectiveness is demonstrated by combined effluent turbidity = 0.3 NTU in 95% of measurements taken each month. Conventional and direct filtration systems must measure combined filter effluent turbidity at least every four hours and continuously monitor turbidity of each individual filter. The maximum turbidity limit is 1 NTU. If the PWS meets filtered water turbidity criteria, it is assumed to achieve the required 2-log Cryptosporidium removal. Performance triggers for individual filter turbidities lead to additional reporting and assessments if exceeded. IESWTR applies to systems = 10,000; LT1ESWTR applies to systems <10,000 people.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Long Term 2 Enhanced Surface Water Treatment Rule (LT2ESWTR)

MCL/MCLG (mg/L unless noted): TT/0

Health Effects: Gastrointestinal illness; Cryptosporidiosis

Monitoring Requirements/Comments: Applies to all public water systems using surface water or ground water under the direct influence of surface water. Monthly monitoring for Cryptosporidium for 2 years is required to characterize the source water. Small systems monitor for E.coli in lieu of Cryptosporidium, unless E.coli is high - then monitor for Cryptosporidium. First round of monitoring takes place between 2006 and 2010, staggered by system size. Second round of Cryptosporidium monitoring due 2015-2019, depending on system size. Calculated Cryptosporidium concentration defines required level of additional treatment. Treatment bins differ for filtered and unfiltered systems. Additional treatment options selected from the Microbial Toolbox. Additional treatment must be in place by 2012 for systems > 50,000 and by 2013 or 2014 for smaller systems, depending on size.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

MCL/MCLG (mg/L unless noted): 0.2/0.2

Health Effects: Thyroid/neurological effects

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.2/0.2

Health Effects: Kidney problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.4/0.4

Health Effects: Liver/weight loss/reproductive system problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.006/0

Health Effects: Cancer risk; liver/reproductive system problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.005/0

Health Effects: Cancer risk; liver problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.007/0.007

Health Effects: Reproductive system problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.02/0.02

Health Effects: Ocular problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Future Regulation

Category: Microbiological Contaminants

Rule: Distribution System Rule

MCL/MCLG (mg/L unless noted): To be determined

Monitoring Requirements/Comments: Possible additional distribution system rule to be developed subsequent to additional research on issues such as intrusion, pressure transients, pipe age, nitrification, finished water storage, new or repaired water mains, corrosion, permeation and leaching.

Status: Future Regulation

Category: Microbiological Contaminants

Rule: Revisions to TCR

MCL/MCLG (mg/L unless noted): To be determined

Monitoring Requirements/Comments: To be determined. Indicator organisms, monitoring requirements, MCL or treatment technique, corrective actions, public notification, sanitary surveys and simultaneous compliance with other rules are all under review. Rule proposal expected early 2010.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Total Coliform Rule (TCR)

MCL/MCLG (mg/L unless noted): MCL = See comments MCLG = 0 for all 3 indicators

Health Effects: Coliforms are bacteria that are naturally present in the environment and are used as an indicator that other, potentially harmful bacteria may be present. The presence of fecal coliform or E.coli may indicate potential contamination that can cause diarrhea, cramps, nausea, headaches or other symptoms.

Monitoring Requirements/Comments: Applies to all surface water and ground water systems. The total number and location of samples is based on the population served and a system-specific sampling plan. If 40 samples or more/month, no more than 5.0% positive; < 40 samples/month, no more than one positive for total coliforms.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.1/0.1

Health Effects: Stomach/intestinal problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.002/0.002

Health Effects: Liver problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Surface Water Treatment Rule (SWTR)

MCL/MCLG (mg/L unless noted): TT/0

Health Effects: Gastrointestinal and other viral infections

Monitoring Requirements/Comments: Minimum four-log removal/inactivation of viruses (99.99%).

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): TT/0

Health Effects: Cancer risk; stomach problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.7/0.7

Health Effects: Kidney/liver problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.00005/0

Health Effects: Cancer risk; liver/kidney/stomach/reproductive system problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Total Coliform Rule (TCR)

MCL/MCLG (mg/L unless noted): MCL = See comments MCLG = 0 for all 3 indicators

Health Effects: Coliforms are bacteria that are naturally present in the environment and are used as an indicator that other, potentially harmful bacteria may be present. The presence of fecal coliform or E.coli may indicate potential contamination that can cause diarrhea, cramps, nausea, headaches or other symptoms.

Monitoring Requirements/Comments: Applies to all surface water and ground water systems. The total number and location of samples is based on the population served and a system-specific sampling plan. If 40 samples or more/month, no more than 5.0% positive; < 40 samples/month, no more than one positive for total coliforms.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Filter Backwash Rule

MCL/MCLG (mg/L unless noted): TT/0

Health Effects: Gastrointestinal illness; Cryptosporidiosis

Monitoring Requirements/Comments: No monitoring is required, but systems must collect and retain information on recycle flows for review by the primacy agency. Applies to all systems using conventional or direct filtration treatment that recycle spent filter backwash water (excluding membrane plants), thickener supernatant or liquids from dewatering processes. TT Requirement - All recycle flows must be returned at the head of the plant so that complete treatment of the recycle stream is provided. Treatment of recycle streams prior to recycle is not required.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

MCL/MCLG (mg/L unless noted): 4.0/4.0

Health Effects: Bone disease

Status: Secondary Standards

Category: Secondary Drinking Water Standards

Monitoring Requirements/Comments: National Secondary Drinking Water Standards are non-enforceable guidelines regulating contaminants that may cause cosmetic effects or aesthetic effects in drinking water. The EPA recommends secondary standards but does not require systems to comply with secondary MCLs. States may establish or enforce standards that differ from these recommendations.

Secondary MCL (mg/L unless noted): 2

Noticeable Effects Above Secondary MCL: Tooth discoloration

Status: Secondary Standards

Category: Secondary Drinking Water Standards

Monitoring Requirements/Comments: National Secondary Drinking Water Standards are non-enforceable guidelines regulating contaminants that may cause cosmetic effects or aesthetic effects in drinking water. The EPA recommends secondary standards but does not require systems to comply with secondary MCLs. States may establish or enforce standards that differ from these recommendations.

Secondary MCL (mg/L unless noted): 0.5

Noticeable Effects Above Secondary MCL: Frothy, cloudy; bitter taste; odor

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Surface Water Treatment Rule (SWTR)

MCL/MCLG (mg/L unless noted): TT/0

Health Effects: Gastrointestinal illness; Giardiasis

Monitoring Requirements/Comments: Minimum three-log removal/inactivation of Giardia (99.9%).

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.7/0.7

Health Effects: Kidney/reproductive system problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

Rule: Radionuclides

MCL/MCLG (mg/L unless noted): 15 pCi/L / 0

Health Effects: Cancer risk

Monitoring Requirements/Comments: Sample point is the distribution system entry point that is representative of all sources being used. Four consecutive quarterly samples must be taken at all sample points. Rule applies to Community Water Systems only.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Ground Water Rule (GWR)

MCL/MCLG (mg/L unless noted): TT

Health Effects: Gastrointestinal illness

Monitoring Requirements/Comments: Applies to all ground water systems. Sanitary surveys required every 3 years for CWS and every 5 years for NCWS. Source water monitoring is required for systems that do not treat to 4-log viral inactivation and is triggered by a total coliform (TC)-positive sample in the distribution system. Samples must be taken within 24 hours of TC-positive at all sources on line at the time the TC sample was taken. Special notification requirements for wholesalers and consecutive systems for TC-positive. If state identifies significant deficiencies in sanitary survey, corrective action is required and can consist of: correcting deficiencies, providing alternative source of water, eliminating source of contamination or providing treatment for 4-log inactivation of viruses.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 1 Disinfectants and Disinfection By-Products

MCL/MCLG (mg/L unless noted): 0.060

Health Effects: Cancer risk

Monitoring Requirements/Comments: Running annual average of quarterly samples at four distribution system sites per plant or entry point.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 2 Disinfectants/Disinfection By-Products Rule

MCL/MCLG (mg/L unless noted): HAA5 0.060 MCLG: MCAA (0.07), DCAA (0), TCAA (0.02)

Health Effects: Nervous system/liver effects

Monitoring Requirements/Comments: Compliance Monitoring: Locational Running Annual Average of quarterly samples (yearly for very small surface water and small ground water systems) taken at locations determined by Initial Distribution System Evaluation (IDSE). Compliance sites are locations in the distribution system where TTHMs are high, HAA5s are high, and at average detention time sites. The number of sites is based on the type of source water and population served. IDSE Plans due in 2006-2008 and IDSE Reports due in 2009-2010, depending on system size. Compliance with LRAAs in 2012-2013, depending on system size.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.0004/0

Health Effects: Cancer risk; liver problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.0002/0

Health Effects: Cancer risk; liver problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Surface Water Treatment Rule (SWTR)

MCL/MCLG (mg/L unless noted): TT

Health Effects: None. Used to measure variety of bacteria common in water.

Monitoring Requirements/Comments: Filtration avoidance is allowed under certain circumstances (see Regulation). Lower bacteria concentration indicates better maintained water system.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.001/0

Health Effects: Cancer risk; liver/reproductive system problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.05/0.05

Health Effects: Kidney/stomach problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Interim Enhanced Surface Water Treatment Rule (IESWTR)

MCL/MCLG (mg/L unless noted): TT/0

Health Effects: Gastrointestinal illness; Cryptosporidiosis

Monitoring Requirements/Comments: Applies to plants using surface water or ground water under the direct influence of surface water. Must continue to comply with SWTR. Treatment effectiveness is demonstrated by combined effluent turbidity = 0.3 NTU in 95% of measurements taken each month. Conventional and direct filtration systems must measure combined filter effluent turbidity at least every four hours and continuously monitor turbidity of each individual filter. The maximum turbidity limit is 1 NTU. If the PWS meets filtered water turbidity criteria, it is assumed to achieve the required 2-log Cryptosporidium removal. Performance triggers for individual filter turbidities lead to additional reporting and assessments if exceeded. IESWTR applies to systems = 10,000; LT1ESWTR applies to systems <10,000 people.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Interim Enhanced Surface Water Treatment Rule (IESWTR)

MCL/MCLG (mg/L unless noted): TT

Health Effects: None. Interferes with disinfection.

Monitoring Requirements/Comments: Applies to plants using surface water or ground water under the direct influence of surface water. Must continue to comply with SWTR. Treatment effectiveness is demonstrated by combined effluent turbidity = 0.3 NTU in 95% of measurements taken each month. Conventional and direct filtration systems must measure combined filter effluent turbidity at least every four hours and continuously monitor turbidity of each individual filter. The maximum turbidity limit is 1 NTU. If the PWS meets filtered water turbidity criteria, it is assumed to achieve the required 2-log Cryptosporidium removal. Performance triggers for individual filter turbidities lead to additional reporting and assessments if exceeded. IESWTR applies to systems = 10,000; LT1ESWTR applies to systems <10,000 people.

Status: Secondary Standards

Category: Secondary Drinking Water Standards

Monitoring Requirements/Comments: National Secondary Drinking Water Standards are non-enforceable guidelines regulating contaminants that may cause cosmetic effects or aesthetic effects in drinking water. The EPA recommends secondary standards but does not require systems to comply with secondary MCLs. States may establish or enforce standards that differ from these recommendations.

Secondary MCL (mg/L unless noted): 0.3

Noticeable Effects Above Secondary MCL: Rusty color; sediment; metallic taste; reddish or orange staining

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

MCL/MCLG (mg/L unless noted): TT (AL = 0.015) / 0

Health Effects: Kidney problems; high blood pressure; infants and children - delays in physical or mental development

Monitoring Requirements/Comments: Sample taken at the kitchen tap. ALs must be met in 90 percent of the samples. Follow-up monitoring every 6 months after corrosion controls initiated or optimized. Reduced monitoring for systems consistently meeting AL. Systems exceeding Lead AL must provide public notification to affected populations.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Surface Water Treatment Rule (SWTR)

MCL/MCLG (mg/L unless noted): TT/0

Health Effects: Legionnaire's disease

Monitoring Requirements/Comments: No limit. Rule assumes if virus & Giardia limits are met, Legionella will be controlled.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.0002/0.0002

Health Effects: Kidney/liver problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Long Term 1 Enhanced Surface Water Treatment Rule (LT1ESWTR)

MCL/MCLG (mg/L unless noted): TT/0

Health Effects: Gastrointestinal illness; Cryptosporidiosis

Monitoring Requirements/Comments: Applies to plants using surface water or ground water under the direct influence of surface water. Must continue to comply with SWTR. Treatment effectiveness is demonstrated by combined effluent turbidity = 0.3 NTU in 95% of measurements taken each month. Conventional and direct filtration systems must measure combined filter effluent turbidity at least every four hours and continuously monitor turbidity of each individual filter. The maximum turbidity limit is 1 NTU. If the PWS meets filtered water turbidity criteria, it is assumed to achieve the required 2-log Cryptosporidium removal. Performance triggers for individual filter turbidities lead to additional reporting and assessments if exceeded. IESWTR applies to systems = 10,000; LT1ESWTR applies to systems <10,000 people.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Long Term 1 Enhanced Surface Water Treatment Rule (LT1ESWTR)

MCL/MCLG (mg/L unless noted): TT

Health Effects: None. Interferes with disinfection.

Monitoring Requirements/Comments: Applies to plants using surface water or ground water under the direct influence of surface water. Must continue to comply with SWTR. Treatment effectiveness is demonstrated by combined effluent turbidity = 0.3 NTU in 95% of measurements taken each month. Conventional and direct filtration systems must measure combined filter effluent turbidity at least every four hours and continuously monitor turbidity of each individual filter. The maximum turbidity limit is 1 NTU. If the PWS meets filtered water turbidity criteria, it is assumed to achieve the required 2-log Cryptosporidium removal. Performance triggers for individual filter turbidities lead to additional reporting and assessments if exceeded. IESWTR applies to systems = 10,000; LT1ESWTR applies to systems <10,000 people.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Long Term 2 Enhanced Surface Water Treatment Rule (LT2ESWTR)

MCL/MCLG (mg/L unless noted): TT/0

Health Effects: Gastrointestinal illness; Cryptosporidiosis

Monitoring Requirements/Comments: Applies to all public water systems using surface water or ground water under the direct influence of surface water. Monthly monitoring for Cryptosporidium for 2 years is required to characterize the source water. Small systems monitor for E.coli in lieu of Cryptosporidium, unless E.coli is high - then monitor for Cryptosporidium. First round of monitoring takes place between 2006 and 2010, staggered by system size. Second round of Cryptosporidium monitoring due 2015-2019, depending on system size. Calculated Cryptosporidium concentration defines required level of additional treatment. Treatment bins differ for filtered and unfiltered systems. Additional treatment options selected from the Microbial Toolbox. Additional treatment must be in place by 2012 for systems > 50,000 and by 2013 or 2014 for smaller systems, depending on size.

Status: Secondary Standards

Category: Secondary Drinking Water Standards

Monitoring Requirements/Comments: National Secondary Drinking Water Standards are non-enforceable guidelines regulating contaminants that may cause cosmetic effects or aesthetic effects in drinking water. The EPA recommends secondary standards but does not require systems to comply with secondary MCLs. States may establish or enforce standards that differ from these recommendations.

Secondary MCL (mg/L unless noted): 0.05

Noticeable Effects Above Secondary MCL: Black to brown color; black staining; bitter metallic taste

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

MCL/MCLG (mg/L unless noted): 0.002/0.002

Health Effects: Kidney damage

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.04/0.04

Health Effects: Reproductive system problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Future Regulation

Category: Microbiological Contaminants

Rule: Distribution System Rule

MCL/MCLG (mg/L unless noted): To be determined

Monitoring Requirements/Comments: Possible additional distribution system rule to be developed subsequent to additional research on issues such as intrusion, pressure transients, pipe age, nitrification, finished water storage, new or repaired water mains, corrosion, permeation and leaching.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

MCL/MCLG (mg/L unless noted): 10/10

Health Effects: Methemoglobinemia (blue baby syndrome)/diuresis

Monitoring Requirements/Comments: Ground water annually; surface water quarterly initially, then annually.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

MCL/MCLG (mg/L unless noted): 1/1

Health Effects: Methemoglobinemia (blue baby syndrome)/diuresis

Monitoring Requirements/Comments: One sample during first 3-year compliance period. Repeat frequency determined by state.

Status: Existing Regulation

Category: Additional Rules

Rule: Consumer Confidence Reports Rule (CCR)

Monitoring Requirements/Comments: PWS to prepare and distribute annual CCR to their customers every July.

Status: Secondary Standards

Category: Secondary Drinking Water Standards

Monitoring Requirements/Comments: National Secondary Drinking Water Standards are non-enforceable guidelines regulating contaminants that may cause cosmetic effects or aesthetic effects in drinking water. The EPA recommends secondary standards but does not require systems to comply with secondary MCLs. States may establish or enforce standards that differ from these recommendations.

Secondary MCL (mg/L unless noted): 3 TON (threshold odor number)

Noticeable Effects Above Secondary MCL: Rotten-egg, musty or chemical smell

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.6/0.6

Health Effects: Kidney/liver/circulatory system problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.2/0.2

Health Effects: Nervous system problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.075/0.075

Health Effects: Kidney/liver/spleen/circulatory system problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.001/0

Health Effects: Cancer risk; liver/kidney problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Future Regulation

Category: Inorganic Chemicals (IOCs)?

Rule: Perchlorate

MCL/MCLG (mg/L unless noted): To be determined

Health Effects: Prevents the thyroid gland from absorbing iodide from the bloodstream, a process known as inhibiting iodide uptake.

Monitoring Requirements/Comments: A Drinking Water Equivalent Level (DWEL) of 24.5 ppb was established in 2005 as part of the Integrated Risk Information System (IRIS) assuming 100% of exposure from drinking water. Contribution to perchlorate exposure from food is under review. Food may be a substantial source of perchlorate. Uncertain whether EPA will regulate perchlorate in drinking water.

Status: Secondary Standards

Category: Secondary Drinking Water Standards

Monitoring Requirements/Comments: National Secondary Drinking Water Standards are non-enforceable guidelines regulating contaminants that may cause cosmetic effects or aesthetic effects in drinking water. The EPA recommends secondary standards but does not require systems to comply with secondary MCLs. States may establish or enforce standards that differ from these recommendations.

Secondary MCL (mg/L unless noted): 6.5 - 8.5 su

Noticeable Effects Above Secondary MCL: Low pH: bitter metallic taste; corrosion. High pH: slippery feel; soda taste; deposits

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.5/0.5

Health Effects: Liver problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.0005/0

Health Effects: Cancer risk; thymus gland/immune deficiencies/reproductive or nervous system problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

Rule: Radionuclides

MCL/MCLG (mg/L unless noted): 4 mrem/year / 0

Health Effects: Cancer risk

Monitoring Requirements/Comments: Primacy agency must designate vulnerable systems. Once deemed vulnerable, quarterly samples required for beta emitters and annual samples for Tritium and Strontium-90 at entry to distribution system. Compliance is based on the running annual average of four quarterly samples taken at each sample point.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

Rule: Radionuclides

MCL/MCLG (mg/L unless noted): 5 pCi/L / 0

Health Effects: Cancer risk

Monitoring Requirements/Comments: Sample point is the distribution system entry point that is representative of all sources being used. Four consecutive quarterly samples must be taken at all sample points. Rule applies to Community Water Systems only.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

Rule: Radionuclides

MCL/MCLG (mg/L unless noted): 15 pCi/L / 0

Health Effects: Cancer risk

Monitoring Requirements/Comments: Sample point is the distribution system entry point that is representative of all sources being used. Four consecutive quarterly samples must be taken at all sample points. Rule applies to Community Water Systems only.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

Rule: Radionuclides

MCL/MCLG (mg/L unless noted): 0.030/0

Health Effects: Kidney problems/cancer risk

Monitoring Requirements/Comments: Same as Combined Radium and Gross Alpha.

Status: Future Regulation

Category: Inorganic Chemicals (IOCs)?

Rule: Radon Rule

MCL/MCLG (mg/L unless noted): 300 pCi/L

Health Effects: Cancer risk

Monitoring Requirements/Comments: At each entry point into the system, which is representative of each well after treatment, initial monitoring would be four consecutive quarters of monitoring. Rule applies to all CWS. An alternative MCL (AMCL) of 4,000 pCi/L is allowable if the CWS or state develops a multimedia mitigation program (MMM) for radon. Rule proposed 1999. Final rule scheduled for 2009 and may need to be re-proposed.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

MCL/MCLG (mg/L unless noted): 0.05/0.05

Health Effects: Hair or fingernail loss; numbness of fingers or toes; circulatory problems

Status: Secondary Standards

Category: Secondary Drinking Water Standards

Monitoring Requirements/Comments: National Secondary Drinking Water Standards are non-enforceable guidelines regulating contaminants that may cause cosmetic effects or aesthetic effects in drinking water. The EPA recommends secondary standards but does not require systems to comply with secondary MCLs. States may establish or enforce standards that differ from these recommendations.

Secondary MCL (mg/L unless noted): 0.1

Noticeable Effects Above Secondary MCL: Skin discoloration; graying of the white part of the eye

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.004/0.004

Health Effects: Problems with blood

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 1 Disinfectants and Disinfection By-Products

Monitoring Requirements/Comments: Applies to all CWS and NTNCWS that treat water with a chemical disinfectant for primary or residual treatment.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 1 Disinfectants and Disinfection By-Products

MCL/MCLG (mg/L unless noted): 0.010/0

Health Effects: Cancer risk

Monitoring Requirements/Comments: One sample per month (ozone systems only). Compliance based on running annual average.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 1 Disinfectants and Disinfection By-Products

MCL/MCLG (mg/L unless noted): 4.0 (as Cl2) MRDL/4 MRDLG

Health Effects: Eye/nose irritation; stomach discomfort; anemia

Monitoring Requirements/Comments: Monitor at the same sample locations as the TCR. Compliance based on running annual arithmetic average of monthly averages. Daily sample at distribution system entry point.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 1 Disinfectants and Disinfection By-Products

MCL/MCLG (mg/L unless noted): 4.0 (as Cl2) MRDL/4 MRDLG

Health Effects: Eye/nose irritation; stomach discomfort

Monitoring Requirements/Comments: Monitor at the same sample locations as the TCR. Compliance based on running annual arithmetic average of monthly averages. Daily sample at distribution system entry point.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 1 Disinfectants and Disinfection By-Products

MCL/MCLG (mg/L unless noted): 0.8 (as ClO2) MRDL / 0.8 MRDLG

Health Effects: Anemia; nervous system problems

Monitoring Requirements/Comments: Daily sample at distribution system entry points. Four quarterly distribution samples. Compliance based on running annual average of quarterly average.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 1 Disinfectants and Disinfection By-Products

MCL/MCLG (mg/L unless noted): 1.0/0.8

Health Effects: Anemia; nervous system problems

Monitoring Requirements/Comments: Daily sample at distribution system entry point.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 1 Disinfectants and Disinfection By-Products

MCL/MCLG (mg/L unless noted): 0.06

Health Effects: Cancer risk

Monitoring Requirements/Comments: Running annual average of quarterly samples at four distribution system sites per plant or entry point.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 1 Disinfectants and Disinfection By-Products

MCL/MCLG (mg/L unless noted): TT

Monitoring Requirements/Comments: Source and treated water TOC sampled once a month. Compliance based on running annual average of TOC removal ratios.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 1 Disinfectants and Disinfection By-Products

MCL/MCLG (mg/L unless noted): 0.08

Health Effects: Cancer risk; potential reproductive system effects; liver/kidney/nervous system problems

Monitoring Requirements/Comments: Running annual average of quarterly samples at four distribution system sites per plant or entry point.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 2 Disinfectants/Disinfection By-Products Rule

MCL/MCLG (mg/L unless noted): 0.060 MCLG: MCAA (0.07), DCAA (0), TCAA (0.02)

Health Effects: Nervous system/liver effects

Monitoring Requirements/Comments: Compliance Monitoring: Locational Running Annual Average of quarterly samples (except yearly for very small surface water and small ground water systems) taken at locations to be determined by Initial Distribution System Evaluation (IDSE). The compliance sites consist of locations where high TTHMs are found, locations where high HAA5s are found, and average detention time sites within the distribution system. The number of sites is based on the type of source water and population served.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 2 Disinfectants/Disinfection By-Products Rule

MCL/MCLG (mg/L unless noted): TTHMs 0.080 MCLG: Chloroform (0.07), BDCM (0), DBCM (0.06), Bromoform (0)

Health Effects: Cancer risk; potential reproductive system effects; liver/kidney/nervous system problems

Monitoring Requirements/Comments: Compliance Monitoring: Locational Running Annual Average of quarterly samples (yearly for very small surface water and small ground water systems) taken at locations determined by Initial Distribution System Evaluation (IDSE). Compliance sites are locations in the distribution system where TTHMs are high, HAA5s are high, and at average detention time sites. The number of sites is based on the type of source water and population served. IDSE Plans due in 2006-2008 and IDSE Reports due in 2009-2010, depending on system size. Compliance with LRAAs in 2012-2013, depending on system size.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.1/0.1

Health Effects: Liver/kidney/circulatory system problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Secondary Standards

Category: Secondary Drinking Water Standards

Monitoring Requirements/Comments: National Secondary Drinking Water Standards are non-enforceable guidelines regulating contaminants that may cause cosmetic effects or aesthetic effects in drinking water. The EPA recommends secondary standards but does not require systems to comply with secondary MCLs. States may establish or enforce standards that differ from these recommendations.

Secondary MCL (mg/L unless noted): 250

Noticeable Effects Above Secondary MCL: Salty taste

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Surface Water Treatment Rule (SWTR)

MCL/MCLG (mg/L unless noted): TT/0

Health Effects: Gastrointestinal and other viral infections

Monitoring Requirements/Comments: Minimum four-log removal/inactivation of viruses (99.99%).

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Surface Water Treatment Rule (SWTR)

MCL/MCLG (mg/L unless noted): TT/0

Health Effects: Gastrointestinal illness; Giardiasis

Monitoring Requirements/Comments: Minimum three-log removal/inactivation of Giardia (99.9%).

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Surface Water Treatment Rule (SWTR)

MCL/MCLG (mg/L unless noted): TT

Health Effects: None. Used to measure variety of bacteria common in water.

Monitoring Requirements/Comments: Filtration avoidance is allowed under certain circumstances (see Regulation). Lower bacteria concentration indicates better maintained water system.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Surface Water Treatment Rule (SWTR)

MCL/MCLG (mg/L unless noted): TT/0

Health Effects: Legionnaire's disease

Monitoring Requirements/Comments: No limit. Rule assumes if virus & Giardia limits are met, Legionella will be controlled.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Surface Water Treatment Rule (SWTR)

MCL/MCLG (mg/L unless noted): TT

Health Effects: None. Interferes with disinfection.

Monitoring Requirements/Comments: Grab samples every four hours or continuous monitoring for turbidity. Continuous chlorine residual required for systems > 3,300. One to four grab samples per day are allowed for systems < 3,300. Must maintain disinfectant residual above 0.2 mg/L entering the distribution system. Performance requirements demonstrated through combination of removal via filtration and inactivation via disinfection. The turbidity TT of 0.5 NTU in 95% of monthly measurements is superceded by IESWTR and LT1ESWTR requirements.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.005/0

Health Effects: Cancer risk; liver problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

MCL/MCLG (mg/L unless noted): 0.002/0.0005

Health Effects: Hair loss; changes in blood; kidney/liver/intestinal problems

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 1/1

Health Effects: Kidney/liver/nervous system problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Total Coliform Rule (TCR)

MCL/MCLG (mg/L unless noted): MCL = See comments MCLG = 0 for all 3 indicators

Health Effects: Coliforms are bacteria that are naturally present in the environment and are used as an indicator that other, potentially harmful bacteria may be present. The presence of fecal coliform or E.coli may indicate potential contamination that can cause diarrhea, cramps, nausea, headaches or other symptoms.

Monitoring Requirements/Comments: Applies to all surface water and ground water systems. The total number and location of samples is based on the population served and a system-specific sampling plan. If 40 samples or more/month, no more than 5.0% positive; < 40 samples/month, no more than one positive for total coliforms.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Total Coliform Rule (TCR)

MCL/MCLG (mg/L unless noted): MCL = See comments MCLG = 0 for all 3 indicators

Health Effects: Coliforms are bacteria that are naturally present in the environment and are used as an indicator that other, potentially harmful bacteria may be present. The presence of fecal coliform or E.coli may indicate potential contamination that can cause diarrhea, cramps, nausea, headaches or other symptoms.

Monitoring Requirements/Comments: Applies to all surface water and ground water systems. The total number and location of samples is based on the population served and a system-specific sampling plan. If 40 samples or more/month, no more than 5.0% positive; < 40 samples/month, no more than one positive for total coliforms.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Total Coliform Rule (TCR)

MCL/MCLG (mg/L unless noted): MCL = See comments MCLG = 0 for all 3 indicators

Health Effects: Coliforms are bacteria that are naturally present in the environment and are used as an indicator that other, potentially harmful bacteria may be present. The presence of fecal coliform or E.coli may indicate potential contamination that can cause diarrhea, cramps, nausea, headaches or other symptoms.

Monitoring Requirements/Comments: Applies to all surface water and ground water systems. The total number and location of samples is based on the population served and a system-specific sampling plan. If 40 samples or more/month, no more than 5.0% positive; < 40 samples/month, no more than one positive for total coliforms.

Status: Future Regulation

Category: Microbiological Contaminants

Rule: Revisions to TCR

MCL/MCLG (mg/L unless noted): To be determined

Monitoring Requirements/Comments: To be determined. Indicator organisms, monitoring requirements, MCL or treatment technique, corrective actions, public notification, sanitary surveys and simultaneous compliance with other rules are all under review. Rule proposal expected early 2010.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Total Coliform Rule (TCR)

MCL/MCLG (mg/L unless noted): MCL = See comments MCLG = 0 for all 3 indicators

Health Effects: Coliforms are bacteria that are naturally present in the environment and are used as an indicator that other, potentially harmful, bacteria may be present. The presence of fecal coliform or E.coli may indicate potential contamination that can cause diarrhea, cramps, nausea, headaches or other symptoms.

Monitoring Requirements/Comments: Applies to all surface water and ground water systems. The total number and location of samples is based on the population served and a system-specific sampling plan. If 40 samples or more/month, no more than 5.0% positive; < 40 samples/month, no more than one positive for total coliforms.

Status: Secondary Standards

Category: Secondary Drinking Water Standards

Monitoring Requirements/Comments: National Secondary Drinking Water Standards are non-enforceable guidelines regulating contaminants that may cause cosmetic effects or aesthetic effects in drinking water. The EPA recommends secondary standards but does not require systems to comply with secondary MCLs. States may establish or enforce standards that differ from these recommendations.

Secondary MCL (mg/L unless noted): 500

Noticeable Effects Above Secondary MCL: Hardness; deposits; colored water; staining; salty taste

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 1 Disinfectants and Disinfection By-Products

MCL/MCLG (mg/L unless noted): TT

Monitoring Requirements/Comments: Source and treated water TOC sampled once a month. Compliance based on running annual average of TOC removal ratios.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 1 Disinfectants and Disinfection By-Products

MCL/MCLG (mg/L unless noted): 0.08

Health Effects: Cancer risk; potential reproductive system effects; liver/kidney/nervous system problems

Monitoring Requirements/Comments: Running annual average of quarterly samples at four distribution system sites per plant or entry point.

Status: Existing Regulation

Category: Disinfectants and Disinfection By-Products

Rule: Stage 2 Disinfectants/Disinfection By-Products Rule

MCL/MCLG (mg/L unless noted): 0.080 MCLG: Chloroform (0.07), BDCM (0), DBCM (0.06), Bromoform (0)

Health Effects: Cancer risk; potential reproductive system effects; liver/kidney/nervous system problems

Monitoring Requirements/Comments: Compliance Monitoring: Locational Running Annual Average of quarterly samples (yearly for very small surface water and small ground water systems) taken at locations determined by Initial Distribution System Evaluation (IDSE). Compliance sites are locations in the distribution system where TTHMs are high, HAA5s are high, and at average detention time sites. The number of sites is based on the type of source water and population served. IDSE Plans due in 2006-2008 and IDSE Reports due in 2009-2010, depending on system size. Compliance with LRAAs in 2012-2013, depending on system size.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Synthetic Organic Chemicals (SOCs)

MCL/MCLG (mg/L unless noted): 0.003/0

Health Effects: Cancer risk; liver/kidney/thyroid problems

Monitoring Requirements/Comments: For SOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.1/0.1

Health Effects: Liver problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.005/0

Health Effects: Cancer risk; liver problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Interim Enhanced Surface Water Treatment Rule (IESWTR)

MCL/MCLG (mg/L unless noted): TT

Health Effects: None. Interferes with disinfection.

Monitoring Requirements/Comments: Applies to plants using surface water or ground water under the direct influence of surface water. Must continue to comply with SWTR. Treatment effectiveness is demonstrated by combined effluent turbidity = 0.3 NTU in 95% of measurements taken each month. Conventional and direct filtration systems must measure combined filter effluent turbidity at least every four hours and continuously monitor turbidity of each individual filter. The maximum turbidity limit is 1 NTU. If the PWS meets filtered water turbidity criteria, it is assumed to achieve the required 2-log Cryptosporidium removal. Performance triggers for individual filter turbidities lead to additional reporting and assessments if exceeded. IESWTR applies to systems = 10,000; LT1ESWTR applies to systems <10,000 people.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Long Term 1 Enhanced Surface Water Treatment Rule (LT1ESWTR)

MCL/MCLG (mg/L unless noted): TT

Health Effects: None. Interferes with disinfection.

Monitoring Requirements/Comments: Applies to plants using surface water or ground water under the direct influence of surface water. Must continue to comply with SWTR. Treatment effectiveness is demonstrated by combined effluent turbidity = 0.3 NTU in 95% of measurements taken each month. Conventional and direct filtration systems must measure combined filter effluent turbidity at least every four hours and continuously monitor turbidity of each individual filter. The maximum turbidity limit is 1 NTU. If the PWS meets filtered water turbidity criteria, it is assumed to achieve the required 2-log Cryptosporidium removal. Performance triggers for individual filter turbidities lead to additional reporting and assessments if exceeded. IESWTR applies to systems = 10,000; LT1ESWTR applies to systems <10,000 people.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Surface Water Treatment Rule (SWTR)

MCL/MCLG (mg/L unless noted): TT

Health Effects: None. Interferes with disinfection.

Monitoring Requirements/Comments: Grab samples every four hours or continuous monitoring for turbidity. Continuous chlorine residual required for systems > 3,300. One to four grab samples per day are allowed for systems < 3,300. Must maintain disinfectant residual above 0.2 mg/L entering the distribution system. Performance requirements demonstrated through combination of removal via filtration and inactivation via disinfection. The turbidity TT of 0.5 NTU in 95% of monthly measurements is superceded by IESWTR and LT1ESWTR requirements.

Status: Existing Regulation

Category: Inorganic Chemicals (IOCs)

Rule: Radionuclides

MCL/MCLG (mg/L unless noted): 0.030/0

Health Effects: Kidney problems/cancer risk

Monitoring Requirements/Comments: Same as Combined Radium and Gross Alpha.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 0.002/0

Health Effects: Cancer risk

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Existing Regulation

Category: Microbiological Contaminants

Rule: Ground Water Rule (GWR)

MCL/MCLG (mg/L unless noted): TT

Health Effects: Gastrointestinal illness

Monitoring Requirements/Comments: Applies to all ground water systems. Sanitary surveys required every 3 years for CWS and every 5 years for NCWS. Source water monitoring is required for systems that do not treat to 4-log viral inactivation and is triggered by a total coliform (TC)-positive sample in the distribution system. Samples must be taken within 24 hours of TC-positive at all sources on line at the time the TC sample was taken. Special notification requirements for wholesalers and consecutive systems for TC-positive. If state identifies significant deficiencies in sanitary survey, corrective action is required and can consist of: correcting deficiencies, providing alternative source of water, eliminating source of contamination or providing treatment for 4-log inactivation of viruses.

Status: Existing Regulation

Category: Organic Chemicals

Rule: Volatile Organic Chemicals (VOCs)

MCL/MCLG (mg/L unless noted): 10/10

Health Effects: Nervous system problems

Monitoring Requirements/Comments: For VOCs: Four consecutive quarterly samples during first compliance period. Compliance is based on annual average of quarterly samples. If no detections are found during initial round, two quarterly samples are required each year for systems serving > 3,300; one sample is required every 3 years for smaller systems. With the completion of source water assessments, primacy agencies are allowed to develop alternative monitoring requirements. Contact your local primacy agency for further information. Applies to CWS and NTNCWS.

Status: Secondary Standards

Category: Secondary Drinking Water Standards

Monitoring Requirements/Comments: National Secondary Drinking Water Standards are non-enforceable guidelines regulating contaminants that may cause cosmetic effects or aesthetic effects in drinking water. The EPA recommends secondary standards but does not require systems to comply with secondary MCLs. States may establish or enforce standards that differ from these recommendations.

Secondary MCL (mg/L unless noted): 5

Noticeable Effects Above Secondary MCL: Metallic taste