Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	CA3910005
PWS Name	MANTECA, CITY OF
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water purchased
Primacy Type	State
Is Wholesaler?	No
Population Served	84928
County Served	San Joaquin

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	Monitoring, Regular	Nitrate Rule	Nitrate	9310039	Returned to Compliance	01-JAN-2024	31-DEC-2024	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	9310008	Returned to Compliance	01-JUL-2013	30-SEP-2013	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	9310007	Returned to Compliance	01-APR-2013	30-JUN-2013	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	9310006	Returned to Compliance	01-JAN-2013	31-MAR-2013	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	9310005	Returned to Compliance	01-OCT-2012	31-DEC-2012	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	1210030	Returned to Compliance	01-JUL-2012	30-SEP-2012	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	1210029	Returned to Compliance	01-APR-2012	30-JUN-2012	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	1210028	Returned to Compliance	01-JAN-2012	31-MAR-2012	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	1210027	Returned to Compliance	01-OCT-2011	31-DEC-2011	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	1110026	Returned to Compliance	01-JUL-2011	30-SEP-2011	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	1110025	Returned to Compliance	01-APR-2011	30-JUN-2011	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	1110024	Returned to Compliance	01-JAN-2011	31-MAR-2011	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	1110023	Returned to Compliance	01-OCT-2010	31-DEC-2010	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	1010022	Returned to Compliance	01-JUL-2010	30-SEP-2010	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	1010021	Returned to Compliance	01-APR-2010	30-JUN-2010	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	1010020	Returned to Compliance	01-JAN-2010	31-MAR-2010	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	1010019	Returned to Compliance	01-OCT-2009	31-DEC-2009	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	910018	Returned to Compliance	01-JUL-2009	30-SEP-2009	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	910017	Returned to Compliance	01-APR-2009	30-JUN-2009	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	910015	Returned to Compliance	01-JAN-2009	31-MAR-2009	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	910014	Returned to Compliance	01-OCT-2008	31-DEC-2008	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	810013	Returned to Compliance	01-JUL-2008	30-SEP-2008	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	810012	Returned to Compliance	01-APR-2008	30-JUN-2008	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	810011	Returned to Compliance	01-JAN-2008	31-MAR-2008	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	810010	Returned to Compliance	01-OCT-2007	31-DEC-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	710009	Returned to Compliance	01-JUL-2007	30-SEP-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	710008	Returned to Compliance	01-APR-2007	30-JUN-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	710007	Returned to Compliance	01-JAN-2007	31-MAR-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	710006	Returned to Compliance	01-OCT-2006	31-DEC-2006	Yes
MCL	Maximum Contaminant Level Violation, Average	Nitrate Rule	Nitrate	210005	Returned to Compliance	04-DEC-2001	04-MAR-2002	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	9310003	Returned to Compliance	01-JUN-1993	30-JUN-1993	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	9310002	Returned to Compliance	01-MAY-1993	31-MAY-1993	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	9310004	Returned to Compliance	01-OCT-1992	31-OCT-1992	Yes
MCL	Maximum Contaminant Level Violation, Single Sample	Inorganic Chemicals	Selenium	8700891	Known	01-JUL-1987	31-JUL-1987	Yes
MCL	Maximum Contaminant Level Violation, Single Sample	Nitrate Rule	Nitrate	8700887	Known	01-JUL-1987	31-JUL-1987	Yes
MCL	Maximum Contaminant Level Violation, Single Sample	Inorganic Chemicals	Fluoride	8700883	Known	01-JUL-1987	31-JUL-1987	Yes
Other	Notification, Public	Miscellaneous Other Rules	-	8700876	Known	01-JUL-1987	31-JUL-1987	No
MCL	Maximum Contaminant Level Violation, Single Sample	Arsenic Rule	Arsenic	8700879	Known	01-JUL-1987	31-JUL-1987	Yes
MR	Monitoring, Regular	Inorganic Chemicals	Selenium	8700893	Known	01-JUL-1987	31-JUL-1987	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	8700889	Known	01-JUL-1987	31-JUL-1987	No
MR	Monitoring, Regular	Inorganic Chemicals	Fluoride	8700885	Known	01-JUL-1987	31-JUL-1987	No
MR	Monitoring, Regular	Arsenic Rule	Arsenic	8700881	Known	01-JUL-1987	31-JUL-1987	No

1 - 42 of 42

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
9910015	9310039	SOX	State Compliance achieved	21-AUG-2025	State	-
9910009	1010019	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	9310008	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	9310007	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	9310006	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	710006	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	710007	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	710008	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	710009	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	810010	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	810011	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	810012	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	810013	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	910014	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	910015	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	910017	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	910018	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	1010020	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	1010021	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	1010022	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	1110023	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	1110024	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	1110025	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	1110026	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	1210027	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	1210028	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	1210029	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	1210030	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
9910009	9310005	SOX	State Compliance achieved	20-NOV-2013	State	Achieved compliance with arsenic MCL (CO number 01-10-09CO-002 issued on 01/05/2009)
210010	210005	SOX	State Compliance achieved	13-MAR-2002	State	ENF_NO:03-10-02C-005; RETURNED TO COMPLIANCE
9510007	9310002	SOX	State Compliance achieved	01-JAN-1994	State	RETURNED TO COMPLIANCE
9510007	9310004	SOX	State Compliance achieved	01-JAN-1994	State	RETURNED TO COMPLIANCE
9510007	9310003	SOX	State Compliance achieved	01-JAN-1994	State	RETURNED TO COMPLIANCE

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All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
SSJID - PURCHASED TREATED SW	31252	Yes	Consecutive Connection	Surface water	Permanent	Active
WELL 07 - AGRICULTURAL/IRRIGATION XCLD	8512	Yes	Well	Ground water	Permanent	Inactive
WELL NO. 30 - RAW TO ATF	75349	Yes	Well	Ground water	Permanent	Active
WELL NO. 29 - RAW TO GAC	65531	Yes	Well	Ground water	Permanent	Active
WELL NO. 28 - RAW	65530	Yes	Well	Ground water	Permanent	Active
WELL NO. 27 - RAW TO GAC	53287	Yes	Well	Ground water	Permanent	Active
WELL NO. 25 - RAW	13736	Yes	Well	Ground water	Permanent	Active
WELL NO. 16 - RAW	13734	Yes	Well	Ground water	Permanent	Active
WELL NO. 15 - RAW	13733	Yes	Well	Ground water	Permanent	Active
WELL NO. 14 - RAW	13732	Yes	Well	Ground water	Permanent	Active
WELL NO. 13 - RAW TO CATF	13731	Yes	Well	Ground water	Permanent	Active
WELL NO. 12 - RAW	13730	Yes	Well	Ground water	Permanent	Active
WELL NO. 24 - RAW TO GAC	13726	Yes	Well	Ground water	Permanent	Active
WELL NO. 22 - RAW	13724	Yes	Well	Ground water	Permanent	Active
WELL NO. 21 - RAW TO CATF	13723	Yes	Well	Ground water	Permanent	Active
WELL NO. 23 - RAW TO GAC	13722	Yes	Well	Ground water	Permanent	Active
WELL NO. 19 - RAW TO CATF	13720	Yes	Well	Ground water	Permanent	Active
WELL NO. 17	13708	Yes	Well	Ground water	Permanent	Active
WELL 05	CA3910005005	Yes	Well	Ground water	Other	Inactive
WELL 09 - IRRIGATION WELL-INACTIVE XCLD	21929	Yes	Well	Ground water	Other	Inactive
WELL 01 - DESTROYED	19694	Yes	Well	Ground water	Other	Inactive
WELL 11 - DESTROYED	19659	Yes	Well	Ground water	Other	Inactive
WELL 06 - DESTROYED	19657	Yes	Well	Ground water	Other	Inactive
WELL 04 - DESTROYED	19655	Yes	Well	Ground water	Other	Inactive
WELL 03 - DESTROYED	19654	Yes	Well	Ground water	Other	Inactive
WELL 02 - DESTROYED	19653	Yes	Well	Ground water	Other	Inactive
WELL 10 - DESTROYED	13729	Yes	Well	Ground water	Other	Inactive
WELL 08 - DESTROYED	13728	Yes	Well	Ground water	Other	Inactive
WELL 05 - INACTIVE-PARK IRR.	13717	Yes	Well	Ground water	Other	Inactive
WELL NO. 18 - STANDBY	13727	Yes	Well	Ground water	Emergency	Active
WELL NO. 20 - RAW STANDBY	13721	Yes	Well	Ground water	Emergency	Active
CATF - COMBINED RAW	57352	No	Common Headers	-	-	Active
GAC COMBINED RAW AT CATF	68014	No	Common Headers	-	-	Active
DISTRIBUTION SYSTEM	31251	No	Distribution System/Zone	-	-	Active
WELL NO. 12 - BLENDED EFFLUENT	1823	No	Treatment Plant	-	-	Active
WELL NO. 15 - BLENDED EFFLUENT	1825	No	Treatment Plant	-	-	Active
WELL NO. 16 - BLENDED EFFLUENT	1826	No	Treatment Plant	-	-	Active
WELL NO. 17 - XCLD	1827	No	Treatment Plant	-	-	Active
WELL NO. 23 - BLENDED EFFLUENT - N & AS	1853	No	Treatment Plant	-	-	Active
WELL NO. 22 - BLENDED EFFLUENT	1855	No	Treatment Plant	-	-	Active
WELL NO. 25 - FILTER EFFLUENT	1856	No	Treatment Plant	-	-	Active
WELL NO. 25 - BLENDED EFFLUENT	1859	No	Treatment Plant	-	-	Active
WELL NO. 14 - FILTER EFFLUENT	1861	No	Treatment Plant	-	-	Active
WELL NO. 27 - BLENDED EFFLUENT - N	53288	No	Treatment Plant	-	-	Active
CATF - FILTER EFFLUENT	57353	No	Treatment Plant	-	-	Active
CATF - BLENDED EFFLUENT	57354	No	Treatment Plant	-	-	Active
WELL NO. 28 - FILTER EFFLUENT	66900	No	Treatment Plant	-	-	Active
WELL NO. 29 - SORB 33 FILTER EFFLUENT-AS	66901	No	Treatment Plant	-	-	Active
WELL NO. 29 - BLENDED EFFLUENT	66902	No	Treatment Plant	-	-	Active
GAC EFFLUENT FOR WELLS 13 & 19 AT CATF	68013	No	Treatment Plant	-	-	Active

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Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
WELL NO. 12 - BLENDED EFFLUENT	1823	Hypochlorination, Post	Disinfection
WELL NO. 13 - XCLD - INACTIVE	1824	Sequestration	Manganese removal
WELL NO. 13 - XCLD - INACTIVE	1824	Hypochlorination, Post	Disinfection
WELL NO. 15 - BLENDED EFFLUENT	1825	Hypochlorination, Post	Disinfection
WELL NO. 16 - BLENDED EFFLUENT	1826	Hypochlorination, Post	Disinfection
WELL NO. 17 - XCLD	1827	Activated Carbon, Granular	Organics removal
WELL NO. 17 - XCLD	1827	Hypochlorination, Post	Disinfection
WELL NO. 18 - XCLD INACTIVE	1840	Hypochlorination, Post	Disinfection
WELL NO. 20 - FILTER EFFLUENT INACTIVE	1841	Hypochlorination, Post	Disinfection
WELL NO. 19 - XCLD - INACTIVE	1851	Hypochlorination, Post	Disinfection
WELL NO. 23 - BLENDED EFFLUENT - N & AS	1853	Hypochlorination, Post	Disinfection
WELL NO. 21 - XCLD - INACTIVE	1854	Hypochlorination, Post	Disinfection
WELL NO. 22 - BLENDED EFFLUENT	1855	Hypochlorination, Post	Disinfection
WELL NO. 25 - FILTER EFFLUENT	1856	Activated Alumina	Inorganics removal
WELL NO. 25 - FILTER EFFLUENT	1856	Hypochlorination, Pre	Disinfection
WELL NO. 24 - ATF EFFLUENT	1857	Activated Alumina	Inorganics removal
WELL NO. 24 - ATF EFFLUENT	1857	Hypochlorination, Pre	Disinfection
WELL NO. 24 - BLENDED ATF EFFLUENT	1858	Rapid Mix	Particulate removal
WELL NO. 25 - BLENDED EFFLUENT	1859	Rapid Mix	Particulate removal
WELL NO. 14 - FILTER EFFLUENT	1861	Filtration, Greensand	Manganese removal
WELL NO. 14 - FILTER EFFLUENT	1861	Filtration, Greensand	Inorganics removal
WELL NO. 14 - FILTER EFFLUENT	1861	Hypochlorination, Pre	Disinfection
WELL NO. 27 - BLENDED EFFLUENT - N	53288	Hypochlorination, Post	Disinfection
WELL NO. 20 - BLENDED EFFLUENT INACTIVE	55092	Rapid Mix	Inorganics removal
CATF - FILTER EFFLUENT	57353	Filtration, Pressure Sand	Inorganics removal
CATF - BLENDED EFFLUENT	57354	Rapid Mix	Inorganics removal
WELL NO. 28 - FILTER EFFLUENT	66900	Hypochlorination, Post	Disinfection
WELL NO. 28 - FILTER EFFLUENT	66900	Filtration, Greensand	Manganese removal
WELL NO. 28 - FILTER EFFLUENT	66900	Filtration, Greensand	Inorganics removal
WELL NO. 29 - SORB 33 FILTER EFFLUENT-AS	66901	Innovative	Inorganics removal
WELL NO. 29 - BLENDED EFFLUENT	66902	Innovative	Inorganics removal
GAC EFFLUENT FOR WELLS 13 & 19 AT CATF	68013	Activated Carbon, Granular	Organics removal
GAC EFF - WELL 24 - ATHERTON TANK-123TCP	68197	Activated Carbon, Granular	Inorganics removal
BLENDED EFF-WELL 24-ATHERTON TNK-AS & N	68198	Innovative	Organics removal
WELL NO. 23 - GAC EFFLUENT - 123 TCP	68588	Activated Carbon, Granular	Organics removal
WELL NO. 27 - GAC EFFLUENT - 123 TCP	68685	Activated Carbon, Granular	Organics removal
WELL NO. 29 - GAC EFFLUENT - 123 TCP	74518	Activated Carbon, Granular	Organics removal
WELL NO. 30 - BLENDED EFFLUENT	75350	Rapid Mix	Inorganics removal
WELL NO. 30 - FILTER EFFLUENT	75351	Activated Alumina	Inorganics removal
WELL 05 - TREATED	CA3910005017	Hypochlorination, Post	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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