Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	MA4055000
PWS Name	CHATHAM WATER DEPARTMENT
PWS Type	Community water system
Owner Type	Local government
Primary Source	Ground water
Primacy Type	State
Is Wholesaler?	No
Population Served	30000
County Served	Barnstable

The tables below list all violations that the state reported to EPA for this water system. Health-based violations are listed first, followed by treatment technique, MRDL, monitoring, reporting, and other violations.

Health-based	Violations of maximum contaminant levels (MCLs) or maximum residual disinfectant levels (MRDLs), which specify the highest concentrations of contaminants or disinfectants, respectively, allowed in drinking water; or of treatment technique (TT) rules, which specify required processes intended to reduce the amounts of contaminants in drinking water. MCLs, MRDLs, and treatment technique rules are all health-based drinking water standards.
Maximum Contaminant Level or MCL	The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
Treatment Technique	A required process intended to reduce the level of a contaminant in drinking water.
Maximum residual disinfectant level or MRDL	The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.
Monitoring & reporting	Failure to conduct regular monitoring of drinking water quality, as required by SDWA, or to submit monitoring results in a timely fashion to the primacy agency or EPA.
Public notification & other	Failure to provide notification to the public as required by the Violations of Public Notification Rule and the Consumer Confidence Report Rule, and violations of other requirements such as those violations related to variances and exemptions.

Violations

Violation Category Code	Violation Type Description	Rule Name	Contaminant Name	Violation ID	Compliance Status Description	Compliance Period Begin Date	Compliance Period End Date	Is Health Based Ind
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	12	Returned to Compliance	01-JUL-2019	-	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	11	Returned to Compliance	01-OCT-2015	31-OCT-2015	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	10	Returned to Compliance	01-SEP-2015	30-SEP-2015	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	9	Returned to Compliance	01-MAY-2015	31-MAY-2015	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	7	Returned to Compliance	01-MAY-2012	31-MAY-2012	Yes
MR	Monitoring, Repeat Major (TCR)	Total Coliform Rule	Coliform (TCR)	8	Returned to Compliance	01-MAY-2012	31-MAY-2012	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	6	Returned to Compliance	01-SEP-2009	30-SEP-2009	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	5	Returned to Compliance	01-FEB-2009	28-FEB-2009	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	4	Known	01-OCT-2008	31-OCT-2008	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	3	Returned to Compliance	01-JUL-2008	31-JUL-2008	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	2	Returned to Compliance	01-SEP-2006	30-SEP-2006	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	1	Returned to Compliance	01-JUL-2006	31-JUL-2006	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	05V0001	Known	01-JUN-2005	30-JUN-2005	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	01V0002	Known	01-JUL-2001	31-JUL-2001	Yes
MCL	Maximum Contaminant Level Violation, Acute (TCR)	Total Coliform Rule	Coliform (TCR)	01V0001	Known	01-JUL-2001	31-JUL-2001	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	00V0002	Known	01-DEC-1999	31-DEC-1999	Yes
MCL	Maximum Contaminant Level Violation, Acute (TCR)	Total Coliform Rule	Coliform (TCR)	00V0001	Known	01-SEP-1999	30-SEP-1999	Yes
MCL	Maximum Contaminant Level Violation, Acute (TCR)	Total Coliform Rule	Coliform (TCR)	97V0001	Returned to Compliance	01-SEP-1996	30-SEP-1996	Yes
MR	Monitoring, Regular	Nitrate Rule	Nitrite	97V0060	Known	01-APR-1996	30-JUN-1996	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	97V0059	Known	01-APR-1996	30-JUN-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2,4-Trichlorobenzene	97V0011	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	97V0057	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	97V0054	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	97V0053	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	97V0052	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	97V0051	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	97V0049	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	97V0047	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	97V0046	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	97V0045	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	97V0044	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	97V0043	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	97V0042	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	trans-1,2-Dichloroethylene	97V0041	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1-Dichloroethylene	97V0039	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Vinyl chloride	97V0038	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	p-Dichlorobenzene	97V0037	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	97V0036	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	DICHLOROMETHANE	97V0032	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Xylenes, Total	97V0030	Known	01-JAN-1996	31-MAR-1996	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	97V0012	Known	01-JAN-1996	31-MAR-1996	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	96V0058	Returned to Compliance	01-NOV-1995	30-NOV-1995	Yes
MR	Monitoring, Regular	Volatile Organic Chemicals	Xylenes, Total	96V0029	Known	01-APR-1995	30-JUN-1995	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2,4-Trichlorobenzene	96V0010	Known	01-APR-1995	30-JUN-1995	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	96V0056	Known	01-APR-1995	30-JUN-1995	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	96V0053	Known	01-APR-1995	30-JUN-1995	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	96V0052	Known	01-APR-1995	30-JUN-1995	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	96V0051	Known	01-APR-1995	30-JUN-1995	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	96V0050	Known	01-APR-1995	30-JUN-1995	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	96V0048	Known	01-APR-1995	30-JUN-1995	No

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Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
36	12	SOX	State Compliance achieved	04-NOV-2019	State	-
34	11	SOX	State Compliance achieved	30-NOV-2015	State	TCR: MONMCL VIOLATION SEPTEMBER AND OCTOBER 2015
34	10	SOX	State Compliance achieved	30-NOV-2015	State	TCR: MONMCL VIOLATION SEPTEMBER AND OCTOBER 2015
32	9	SOX	State Compliance achieved	31-AUG-2015	State	TCR: MONMCL MAY 2015
30	8	SOX	State Compliance achieved	31-AUG-2012	State	TCR: MONMCL & MAJREP MAY 2012
30	7	SOX	State Compliance achieved	31-AUG-2012	State	TCR: MONMCL & MAJREP MAY 2012
28	6	SOX	State Compliance achieved	30-NOV-2009	State	TCR: MONMCL SEP'09
26	5	SOX	State Compliance achieved	09-JUN-2009	State	TCR:MONMCL FEB'09
23	3	SOX	State Compliance achieved	25-NOV-2008	State	MONMCL JULY'08
24	4	SFL	State Administrative/Compliance Order without penalty issued	25-NOV-2008	State	TCR: MONMCL OCT'08
19	1	SOX	State Compliance achieved	06-MAR-2007	State	TCR: MONMCL JULY 2006
21	2	SOX	State Compliance achieved	06-MAR-2007	State	TCR:MONMCL SEPT. 2006
17	05V0001	SFL	State Administrative/Compliance Order without penalty issued	21-JUN-2005	State	SYSTEM CHLORINATING SOURCES AND DISTRIBUTION, ISSUED, PN AND CERT. FORM AS REQUIRED, SAMPLING SYSTEM
14	01V0002	SFL	State Administrative/Compliance Order without penalty issued	07-AUG-2001	State	COMPLIED WITH PN REQUIREMENTS, SYSTEM DISINFECTING UNTIL FURTHER NOTICE.
14	01V0001	SFL	State Administrative/Compliance Order without penalty issued	07-AUG-2001	State	COMPLIED WITH PN REQUIREMENTS, SYSTEM DISINFECTING UNTIL FURTHER NOTICE.
12	00V0002	SFL	State Administrative/Compliance Order without penalty issued	09-MAR-2000	State	ISSUED PN AS REQUIRED, CHLORINATED SYSTEM.
11	00V0001	SFL	State Administrative/Compliance Order without penalty issued	19-OCT-1999	State	SYSTEM EXCEEDED MCL FOR TC, E.COLI PRESENT. NOTIFIED PUBLIC AS REQ. IN REGS FOR ACUTE MCL VIOLATIONS.
10	97V0043	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0060	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0059	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0057	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0054	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0053	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0052	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0051	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0049	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0047	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0046	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0045	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0044	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0042	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0041	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0039	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0038	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0037	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0036	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0032	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0030	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0012	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
10	97V0011	SFL	State Administrative/Compliance Order without penalty issued	04-DEC-1996	State	P. NOTICE SAMPLING REQ.
9	97V0001	SOX	State Compliance achieved	09-OCT-1996	State	P. NOTICE PUBLISHED, DEP RECEIVED COPY.
7	96V0058	SOX	State Compliance achieved	04-JAN-1996	State	NOTICE PUBLISHED
8	96V0036	SFL	State Administrative/Compliance Order without penalty issued	17-NOV-1995	State	FAILED TO MON VOC'S, SAMPLED AND PUBLISHED NOTICE.
8	96V0037	SFL	State Administrative/Compliance Order without penalty issued	17-NOV-1995	State	FAILED TO MON VOC'S, SAMPLED AND PUBLISHED NOTICE.
8	96V0038	SFL	State Administrative/Compliance Order without penalty issued	17-NOV-1995	State	FAILED TO MON VOC'S, SAMPLED AND PUBLISHED NOTICE.
8	96V0040	SFL	State Administrative/Compliance Order without penalty issued	17-NOV-1995	State	FAILED TO MON VOC'S, SAMPLED AND PUBLISHED NOTICE.
8	96V0041	SFL	State Administrative/Compliance Order without penalty issued	17-NOV-1995	State	FAILED TO MON VOC'S, SAMPLED AND PUBLISHED NOTICE.
8	96V0050	SFL	State Administrative/Compliance Order without penalty issued	17-NOV-1995	State	FAILED TO MON VOC'S, SAMPLED AND PUBLISHED NOTICE.
8	96V0051	SFL	State Administrative/Compliance Order without penalty issued	17-NOV-1995	State	FAILED TO MON VOC'S, SAMPLED AND PUBLISHED NOTICE.
8	96V0031	SFL	State Administrative/Compliance Order without penalty issued	17-NOV-1995	State	FAILED TO MON VOC'S, SAMPLED AND PUBLISHED NOTICE.

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All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
SO. CHATHAM WELL 1	1	Yes	Well	Ground water	Permanent	Active
GP WELL 7	7	Yes	Well	Ground water	Permanent	Active
GP WELL 6	6	Yes	Well	Ground water	Permanent	Active
TRAINING FIELD WELL	5	Yes	Well	Ground water	Permanent	Active
INDIAN HILL WELL	4	Yes	Well	Ground water	Permanent	Active
WELL 11	35	Yes	Well	Ground water	Permanent	Active
WELL 10	33	Yes	Well	Ground water	Permanent	Active
SO. CHATHAM WELL 3	3	Yes	Well	Ground water	Permanent	Active
TOWN FOREST WELL 9	24	Yes	Well	Ground water	Permanent	Active
SO. CHATHAM WELL 2	2	Yes	Well	Ground water	Permanent	Active
WELL 8	18	Yes	Well	Ground water	Permanent	Active
SO. CHATHAM WELL 1 PUMP	10	No	Pump Facility	-	-	Active
SO. CHATHAM WELL 2 PUMP	11	No	Pump Facility	-	-	Active
SO. CHATHAM WELL 3 PUMP	12	No	Pump Facility	-	-	Active
INDIAN HILL WELL PUMP	13	No	Pump Facility	-	-	Active
TRAINING FIELD WELL PUMP 5	14	No	Pump Facility	-	-	Active
GP WELL 6 PUMP	15	No	Pump Facility	-	-	Active
GP WELL 7 PUMP	16	No	Pump Facility	-	-	Active
WELL 8 PUMP	19	No	Pump Facility	-	-	Active
TOWN FOREST WELL 9 PUMP	25	No	Pump Facility	-	-	Active
FILTRATION PLANT	28	No	Pump Facility	-	-	Active
WELL 10 PUMP	34	No	Pump Facility	-	-	Active
WELL 11 PUMP	36	No	Pump Facility	-	-	Active
TANK 2 GREAT HILL	17	No	Storage	-	-	Active
TANK 1 GREAT HILL	8	No	Storage	-	-	Active
SO. CHATHAM CHEMICAL FEED BUILDING	20	No	Treatment Plant	-	-	Active
TRAINING FIELD WELL PUMP STATION WELL 5	21	No	Treatment Plant	-	-	Active
FILTRATION PLANT 6,7,9	29	No	Treatment Plant	-	-	Active
WELL 8 TREATMENT TRAIN	30	No	Treatment Plant	-	-	Active
WELL 4 TREATMENT	31	No	Treatment Plant	-	-	Active
WELLS 10 11 TREATMENT PLANT	37	No	Treatment Plant	-	-	Active
WELL 6 PUMP STATION	22	No	Treatment Plant	-	-	Inactive
WELL 7 PUMP STATION	23	No	Treatment Plant	-	-	Inactive
TOWN FOREST PS 9 TREATMENT	26	No	Treatment Plant	-	-	Inactive
WELL 6 FILTRATION PLANT	27	No	Treatment Plant	-	-	Inactive

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Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
SO. CHATHAM CHEMICAL FEED BUILDING	20	pH Adjustment	Corrosion control
SO. CHATHAM CHEMICAL FEED BUILDING	20	4-Log Treatment of Viruses	Disinfection
SO. CHATHAM CHEMICAL FEED BUILDING	20	Sequestration	Corrosion control
TRAINING FIELD WELL PUMP STATION WELL 5	21	pH Adjustment	Corrosion control
TRAINING FIELD WELL PUMP STATION WELL 5	21	Sequestration	Iron removal
TRAINING FIELD WELL PUMP STATION WELL 5	21	Hypochlorination, Post	Disinfection
TRAINING FIELD WELL PUMP STATION WELL 5	21	Activated Carbon, Granular	Organics removal
WELL 7 PUMP STATION	23	pH Adjustment	Corrosion control
WELL 7 PUMP STATION	23	Sequestration	Iron removal
WELL 7 PUMP STATION	23	Hypochlorination, Post	Disinfection
TOWN FOREST PS 9 TREATMENT	26	Hypochlorination, Post	Disinfection
TOWN FOREST PS 9 TREATMENT	26	Sequestration	Corrosion control
TOWN FOREST PS 9 TREATMENT	26	pH Adjustment	Corrosion control
WELL 6 FILTRATION PLANT	27	Aeration, Slat Tray	Organics removal
WELL 6 FILTRATION PLANT	27	Permanganate	Iron removal
WELL 6 FILTRATION PLANT	27	Filtration, Greensand	Manganese removal
WELL 6 FILTRATION PLANT	27	Hypochlorination, Post	Disinfection
WELL 6 FILTRATION PLANT	27	pH Adjustment, Post	Corrosion control
WELL 6 FILTRATION PLANT	27	Inhibitor, Orthophosphate	Corrosion control
FILTRATION PLANT 6,7,9	29	Aeration, Slat Tray	Organics removal
FILTRATION PLANT 6,7,9	29	Permanganate	Iron removal
FILTRATION PLANT 6,7,9	29	Filtration, Greensand	Manganese removal
FILTRATION PLANT 6,7,9	29	Hypochlorination, Post	Disinfection
FILTRATION PLANT 6,7,9	29	pH Adjustment, Post	Corrosion control
FILTRATION PLANT 6,7,9	29	Inhibitor, Orthophosphate	Corrosion control
WELL 8 TREATMENT TRAIN	30	pH Adjustment	Corrosion control
WELL 8 TREATMENT TRAIN	30	Inhibitor, Bimetallic Phospate	Corrosion control
WELL 8 TREATMENT TRAIN	30	Hypochlorination, Post	Disinfection
WELL 4 TREATMENT	31	Hypochlorination, Pre	Disinfection
WELL 4 TREATMENT	31	pH Adjustment	Corrosion control
WELLS 10 11 TREATMENT PLANT	37	pH Adjustment	Corrosion control
WELLS 10 11 TREATMENT PLANT	37	Hypochlorination, Pre	Disinfection
WELLS 10 11 TREATMENT PLANT	37	Inhibitor, Bimetallic Phospate	Corrosion control
WELLS 10 11 TREATMENT PLANT	37	4-Log Treatment of Viruses	Disinfection

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For more information on a Water System:
Ask the operators of your water system, contact your primacy agency or file a Freedom of Information Act (FOIA) request.
Drinking water in general: Find out more about your drinking water web site or call the Safe Drinking Water Hotline (1-800-426-4791). EPA has also prepared a table about various regulated drinking water contaminants.
Tools for accessing EPA drinking water data: Safe Drinking Water Information System (SDWIS) Federal Reporting Services and Drinking Water Performance and Results Report.
Research Data: As well as monitoring the levels of drinking water contaminants for which EPA has set standards, EPA, states, and water systems also carry out studies of contaminants that may need to be regulated in the future. For more information about these contaminants, please see the National Contaminant Occurrence Database.

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