Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	NV0000015
PWS Name	CARSON CITY PUBLIC WORKS
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water
Primacy Type	State
Is Wholesaler?	No
Population Served	59000
County Served

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	222385	Returned to Compliance	01-JAN-2022	31-DEC-2022	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	ETHYLENE DIBROMIDE	222439	Returned to Compliance	01-JAN-2020	31-DEC-2022	No
MR	Monitoring, Regular	Nitrate Rule	Nitrite	222370	Returned to Compliance	01-JAN-2020	31-DEC-2022	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Chlordane	222440	Returned to Compliance	01-JAN-2020	31-DEC-2022	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	222148	Returned to Compliance	01-FEB-2015	28-FEB-2015	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Radium-226	222149	Returned to Compliance	01-FEB-2015	28-FEB-2015	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Radium-228	222150	Returned to Compliance	01-FEB-2015	28-FEB-2015	No
MR	Monitoring, Regular	Arsenic Rule	Arsenic	221818	Returned to Compliance	01-DEC-2013	31-DEC-2013	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) phthalate	221817	Returned to Compliance	01-JAN-2013	31-MAR-2013	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Xylenes, Total	221802	Returned to Compliance	01-JUL-2012	30-SEP-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	221790	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	221795	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	221793	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	221798	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	221807	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	221805	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	221804	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	221796	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	221806	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	221809	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	221791	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	221801	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	trans-1,2-Dichloroethylene	221808	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1-Dichloroethylene	221800	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Vinyl chloride	221794	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	p-Dichlorobenzene	221803	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	221799	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	DICHLOROMETHANE	221792	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	221797	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2,4-Trichlorobenzene	221810	Returned to Compliance	01-JAN-2012	31-DEC-2012	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	ETHYLENE DIBROMIDE	221861	Returned to Compliance	01-JAN-2011	31-DEC-2013	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Hexachlorocyclopentadiene	221848	Returned to Compliance	01-JAN-2011	31-DEC-2013	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	221784	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	221783	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	221761	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	221782	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	221781	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	221780	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	221779	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	221778	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	221777	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	221776	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	221775	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	221774	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	221773	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring, Regular	Volatile Organic Chemicals	trans-1,2-Dichloroethylene	221772	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1-Dichloroethylene	221771	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Vinyl chloride	221770	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring, Regular	Volatile Organic Chemicals	p-Dichlorobenzene	221769	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	221768	Returned to Compliance	01-JAN-2011	31-DEC-2011	No

1 - 50 of 94

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
2570	222370	SOX	State Compliance achieved	14-JUN-2023	State	-
2570	222385	SOX	State Compliance achieved	14-JUN-2023	State	-
2570	222440	SOX	State Compliance achieved	14-JUN-2023	State	-
2570	222439	SOX	State Compliance achieved	14-JUN-2023	State	-
2525	222150	SIE	State Public Notification requested	03-NOV-2015	State	-
2525	222148	SIE	State Public Notification requested	03-NOV-2015	State	-
2525	222149	SIE	State Public Notification requested	03-NOV-2015	State	-
2529	221768	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221767	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221770	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221771	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221772	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221773	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221774	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221775	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221776	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221777	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221778	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221779	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221780	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221781	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221782	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221783	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221784	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221790	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221791	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221792	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221793	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221794	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221795	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221796	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221797	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221798	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221799	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221800	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221801	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221802	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221803	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221804	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221805	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221806	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221807	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221808	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221809	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221810	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221766	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221765	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221764	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2529	221769	SOX	State Compliance achieved	04-AUG-2015	State	SAMPLE TAKEN
2507	221834	SOX	State Compliance achieved	30-JUL-2014	State	SAMPLE TAKEN

1 - 50 of 94

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
CC INTERTIE FROM NORTH COUNTY NV0977	6854	Yes	Consecutive Connection	Surface water	Emergency	Active
WELL 4A ELAINE ST	896	Yes	Well	Ground water	Permanent	Inactive
WELL 4B ELAINE ST	6505	Yes	Well	Ground water	Permanent	Inactive
WELL 16B LAKEVIEW	5695	Yes	Well	Ground water	Permanent	Inactive
WELL 49 STEWART ST	4361	Yes	Well	Ground water	Permanent	Inactive
WELL 3 WINNIE LN	395	Yes	Well	Ground water	Permanent	Inactive
WELL 24A E 5TH ST INACTIVE	2347	Yes	Well	Ground water	Permanent	Inactive
WELL 47 HIDDEN MEADOWS	2346	Yes	Well	Ground water	Permanent	Inactive
WELL 10A COLLEGE AVE	1811	Yes	Well	Ground water	Permanent	Inactive
WELL 41A E 5TH ST INACTIVE	1207	Yes	Well	Ground water	Permanent	Inactive
WELL 16 MONITORING WELL	1191	Yes	Well	Ground water	Permanent	Inactive
WELL 13 LAKEVIEW PLUGGED AND ABANDONED	1186	Yes	Well	Ground water	Permanent	Inactive
WELL 12 LAKEVIEW	1176	Yes	Well	Ground water	Permanent	Inactive
WELL 7 N CARSON ST	1134	Yes	Well	Ground water	Permanent	Inactive
WINNIE LANE WELL 3 REPLACEMENT	9461	Yes	Well	Ground water	Permanent	Active
WELL 50	6325	Yes	Well	Ground water	Permanent	Active
WELL 41B RIVERVIEW PARK SOUTH	6280	Yes	Well	Ground water	Permanent	Active
WELL 24B E 5TH ST	5722	Yes	Well	Ground water	Permanent	Active
WELL 25B RIVERVIEW PARK NORTH	5471	Yes	Well	Ground water	Permanent	Active
WELL 10B COLLEGE PARKWAY (ASR)	5469	Yes	Well	Ground water	Permanent	Active
WELL 55 WNCC	5465	Yes	Well	Ground water	Permanent	Active
WELL 54 FUJI	5464	Yes	Well	Ground water	Permanent	Active
WELL 53 SUNSET	5463	Yes	Well	Ground water	Permanent	Active
WELL 51 FOOTHILL	5462	Yes	Well	Ground water	Permanent	Active
WELL 43 BENNETT AVE	3055	Yes	Well	Ground water	Permanent	Active
WELL 48 THAMES LN	2350	Yes	Well	Ground water	Permanent	Active
WELL 46 SILVER OAK	2349	Yes	Well	Ground water	Permanent	Active
WELL 45 SONOMA ST	2348	Yes	Well	Ground water	Permanent	Active
WELL 44 EMPIRE RANCH RD	2334	Yes	Well	Ground water	Permanent	Active
WELL 40 MORGAN MILL	1810	Yes	Well	Ground water	Permanent	Active
WELL 34 MILLS PARK	1809	Yes	Well	Ground water	Permanent	Active
WELL 38 S EDMONDS	1202	Yes	Well	Ground water	Permanent	Active
WELL 33 BRUNSWICK	1197	Yes	Well	Ground water	Permanent	Active
WELL 11B SECOND ST	1194	Yes	Well	Ground water	Permanent	Active
WELL 11A SECOND ST	1171	Yes	Well	Ground water	Permanent	Active
WELL 9 SNYDER	1161	Yes	Well	Ground water	Permanent	Active
WELL 8 SILVER SAGE	1151	Yes	Well	Ground water	Permanent	Active
WELL 6 FOOTHILL	1104	Yes	Well	Ground water	Permanent	Active
WELL 5 BATH ST	1041	Yes	Well	Ground water	Permanent	Active
WELL 25A RIVERVIEW PARK NORTH	386	Yes	Well	Ground water	Emergency	Inactive
SPRING 4	5762	Yes	Spring	Ground water under the influence of surface water	Permanent	Inactive
CUSTERS SPRINGS	5763	Yes	Spring	Ground water under the influence of surface water	Permanent	Active
INTAKE FOR HOBART MARLETTE	3100	Yes	Intake	Surface water	Permanent	Active
INTAKE AT ASH CANYON	1212	Yes	Intake	Surface water	Permanent	Active
INTAKE AT KINGS CANYON	1209	Yes	Intake	Surface water	Permanent	Active
CC INTERTIE FROM DAYTON NV0032	6667	Yes	Consecutive Connection	Ground water	Permanent	Active
CC INTERTIE FROM EAST VALLEY NV2216	6850	Yes	Consecutive Connection	Surface water	Permanent	Active
DISTRIBUTION SYSTEM	1222	No	Distribution System/Zone	-	-	Active
PF GONI BOOSTER	4028	No	Pump Facility	-	-	Active
PF TANSTAAFL BOOSTER	4029	No	Pump Facility	-	-	Active

1 - 50 of 154

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
WELL 4 CHLORINATOR W11	1008	Hypochlorination, Post	Disinfection
WELL 5 CHLORINATOR W19	1086	Hypochlorination, Post	Disinfection
WELL 6 CHLORINATOR W18	1129	Hypochlorination, Post	Disinfection
WELL 7 CHLORINATOR W24	1146	Hypochlorination, Post	Disinfection
WELL 8 CHLORINATOR W13	1158	Hypochlorination, Post	Disinfection
WELL 9 CHLORINATOR W16	1165	Hypochlorination, Post	Disinfection
WELL 10 CHLORINATOR	1169	Hypochlorination, Post	Disinfection
WELL 11A & 11B CHLORINATOR BLD W09 & W10	1174	Hypochlorination, Post	Disinfection
WELL 12 CHLORINATOR	1179	Hypochlorination, Post	Disinfection
WELL 16B CHLORINATOR W34	1193	Hypochlorination, Post	Disinfection
WELL 33 CHLORINATOR W01	1199	Hypochlorination, Post	Disinfection
WELL 34 CHLORINATOR W08	1201	Hypochlorination, Post	Disinfection
WELL 38 CHLORINATOR W15	1204	Hypochlorination, Post	Disinfection
WELL 40 CHLORINATOR W02	1206	Hypochlorination, Post	Disinfection
DISTRIBUTION SYSTEM CHLORINATOR	2562	Hypochlorination, Post	Disinfection
QUILL SURFACE WATER PLANT	3830	Filtration, Diatomaceous Earth	Particulate removal
QUILL SURFACE WATER PLANT	3830	Sedimentation	Particulate removal
QUILL SURFACE WATER PLANT	3830	Hypochlorination, Post	Disinfection
QUILL SURFACE WATER PLANT	3830	Hypochlorination, Pre	Disinfection
WELL 25 B CHLORINATOR W33	387	Hypochlorination, Post	Disinfection
WELL 24B CHLORINATOR W35	4392	Hypochlorination, Post	Disinfection
WELL 41B CHLORINATOR W38	4393	Hypochlorination, Post	Disinfection
WELL 43 CHLORINATOR W14	4394	Hypochlorination, Post	Disinfection
WELL 44 CHLORINATOR W03	4395	Hypochlorination, Post	Disinfection
WELL 45 CHLORINATOR W12	4396	Hypochlorination, Post	Disinfection
WELL 46 CHLORINATOR W20	4397	Hypochlorination, Post	Disinfection
WELL 47 CHLORINATOR W04	4398	Hypochlorination, Post	Disinfection
WELL 48 CHLORINATOR	4399	Hypochlorination, Pre	Disinfection
WELL 49 CHLORINATOR W26	4400	Hypochlorination, Post	Disinfection
WELL 10B CHLORINATOR W32	5470	Hypochlorination, Post	Disinfection
WELL 51 CHLORINATOR W28	5553	Hypochlorination, Post	Disinfection
WELL 53 CHLORINATOR W29	5554	Hypochlorination, Post	Disinfection
WELL 54 CHLORINATOR W30	5555	Hypochlorination, Post	Disinfection
WELL 55 CHLORINATOR W31	5556	Hypochlorination, Post	Disinfection
HWY 50 BPS CHLORINATOR PF45	5842	Hypochlorination, Post	Disinfection
FIFTH ST ARSENIC REMOVAL PLANT	6059	Coagulation	Inorganics removal
FIFTH ST ARSENIC REMOVAL PLANT	6059	Filtered	Particulate removal
FIFTH ST ARSENIC REMOVAL PLANT	6059	Hypochlorination, Pre	Inorganics removal
FIFTH ST ARSENIC REMOVAL PLANT	6059	Coagulation	Inorganics removal
WELL 50 CHLORINATOR W39	6326	Hypochlorination, Post	Disinfection
SUNRIDGE BPS CHLORINATOR PF10	7254	Ozonation, Pre	Disinfection
WELL 3 REPLACEMENT CHLORINATOR W40	810	Hypochlorination, Post	Disinfection

1 - 42 of 42

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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