Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	TX2100001
PWS Name	CITY OF CENTER
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water
Primacy Type	State
Is Wholesaler?	Yes
Population Served	5450
County Served	Shelby

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
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	5614	Open	01-JUL-2025	-	No
MON	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	5595	Returned to Compliance	01-SEP-2016	30-SEP-2016	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	5594	Returned to Compliance	01-JUL-2016	30-SEP-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	5586	Returned to Compliance	01-APR-2016	30-JUN-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	5579	Returned to Compliance	01-JAN-2016	31-MAR-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	5580	Returned to Compliance	01-JAN-2016	31-MAR-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	5581	Returned to Compliance	01-JAN-2016	31-MAR-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	5575	Returned to Compliance	01-OCT-2015	31-DEC-2015	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	5574	Returned to Compliance	01-OCT-2015	31-DEC-2015	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	5569	Returned to Compliance	01-JUL-2015	30-SEP-2015	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	5568	Returned to Compliance	01-JUL-2015	30-SEP-2015	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	5563	Returned to Compliance	01-APR-2015	30-JUN-2015	Yes
MR	Lead Consumer Notice	Lead and Copper Rule	Lead and Copper Rule	5541	Returned to Compliance	30-DEC-2013	-	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	5540	Returned to Compliance	01-MAY-2012	31-MAY-2012	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	5407	Returned to Compliance	01-JAN-2007	31-MAR-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	5307	Returned to Compliance	01-JAN-2007	31-MAR-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	5207	Returned to Compliance	01-OCT-2006	31-DEC-2006	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	5107	Returned to Compliance	01-OCT-2006	31-DEC-2006	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	4907	Returned to Compliance	01-JUL-2006	30-SEP-2006	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	5007	Returned to Compliance	01-JUL-2006	30-SEP-2006	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	4706	Returned to Compliance	01-APR-2006	30-JUN-2006	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	4606	Returned to Compliance	01-APR-2006	30-JUN-2006	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	4306	Returned to Compliance	01-JAN-2006	31-MAR-2006	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	4206	Returned to Compliance	01-JAN-2006	31-MAR-2006	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	4406	Returned to Compliance	01-OCT-2005	31-DEC-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	4506	Returned to Compliance	01-OCT-2005	31-DEC-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	4006	Returned to Compliance	01-JUL-2005	30-SEP-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	4105	Returned to Compliance	01-JUL-2005	30-SEP-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	3605	Returned to Compliance	01-APR-2005	30-JUN-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	3505	Returned to Compliance	01-APR-2005	30-JUN-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	3805	Returned to Compliance	01-JAN-2005	31-MAR-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	3905	Returned to Compliance	01-JAN-2005	31-MAR-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	205	Returned to Compliance	01-OCT-2004	31-DEC-2004	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	105	Returned to Compliance	01-OCT-2004	31-DEC-2004	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	3704	Returned to Compliance	01-JUL-2004	30-SEP-2004	Yes
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	803	Returned to Compliance	01-JUN-2003	30-JUN-2003	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	903	Returned to Compliance	01-JUN-2003	30-JUN-2003	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	1003	Returned to Compliance	01-JUN-2003	30-JUN-2003	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	1503	Returned to Compliance	01-MAY-2003	31-MAY-2003	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	1603	Returned to Compliance	01-MAY-2003	31-MAY-2003	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	1403	Returned to Compliance	01-MAY-2003	31-MAY-2003	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	2403	Returned to Compliance	01-APR-2003	30-APR-2003	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	2703	Returned to Compliance	01-APR-2003	30-APR-2003	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	2503	Returned to Compliance	01-APR-2003	30-APR-2003	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	2303	Returned to Compliance	01-MAR-2003	31-MAR-2003	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	2103	Returned to Compliance	01-MAR-2003	31-MAR-2003	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	2203	Returned to Compliance	01-MAR-2003	31-MAR-2003	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	3103	Returned to Compliance	01-FEB-2003	28-FEB-2003	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	3003	Returned to Compliance	01-FEB-2003	28-FEB-2003	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	2003	Returned to Compliance	01-JAN-2003	31-JAN-2003	No

1 - 50 of 65

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
7237	5614	SIA	State Violation/Reminder Notice	31-DEC-2025	State	-
7233	5595	SOX	State Compliance achieved	31-JUL-2017	State	CHBROWN; 07/27/2017; PWS met criteria to return violation to compliance -- Applied SOX code to September 2016 3A violation.
7227	5594	SOX	State Compliance achieved	18-OCT-2016	State	11/22/16; PER 4Q2016 HAA5 DBP2-01 LRAA PREVIOUS VIOLATIONS CAN BE SOX'D
7227	5586	SOX	State Compliance achieved	18-OCT-2016	State	11/22/16; PER 4Q2016 HAA5 DBP2-01 LRAA PREVIOUS VIOLATIONS CAN BE SOX'D
7227	5581	SOX	State Compliance achieved	18-OCT-2016	State	11/22/16; PER 4Q2016 HAA5 DBP2-01 LRAA PREVIOUS VIOLATIONS CAN BE SOX'D
7224	5574	SOX	State Compliance achieved	09-SEP-2016	State	09/29/16; PER 3Q2016 HAA5 DBP2-02 LRAA SOX'D PREVIOUS VIOLATIONS
7224	5568	SOX	State Compliance achieved	09-SEP-2016	State	09/29/16; PER 3Q2016 HAA5 DBP2-02 LRAA SOX'D PREVIOUS VIOLATIONS
7224	5563	SOX	State Compliance achieved	09-SEP-2016	State	09/29/16; PER 3Q2016 HAA5 DBP2-02 LRAA SOX'D PREVIOUS VIOLATIONS
7224	5580	SOX	State Compliance achieved	09-SEP-2016	State	09/29/16; PER 3Q2016 HAA5 DBP2-02 LRAA SOX'D PREVIOUS VIOLATIONS
7219	5569	SFO	State Administrative/Compliance Order with penalty issued	24-AUG-2016	State	DOCKET NO 2016-0107-PWS-E; FINAL TR DUE DATE 09/08/2017; FILE CLOSED 12/22/2016
7219	5575	SFO	State Administrative/Compliance Order with penalty issued	24-AUG-2016	State	DOCKET NO 2016-0107-PWS-E; FINAL TR DUE DATE 09/08/2017; FILE CLOSED 12/22/2016
7219	5579	SFO	State Administrative/Compliance Order with penalty issued	24-AUG-2016	State	DOCKET NO 2016-0107-PWS-E; FINAL TR DUE DATE 09/08/2017; FILE CLOSED 12/22/2016
7183	5540	SOX	State Compliance achieved	07-APR-2015	State	-
7182	5541	SOX	State Compliance achieved	20-AUG-2013	State	-
7160	703	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	3103	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	3003	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	2903	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	2803	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	2703	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	2603	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	2503	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	2403	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	2303	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	2203	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	2103	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	2003	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	1903	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	1803	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	1703	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	1603	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	1503	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	1403	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	1302	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	1202	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	1102	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	303	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	403	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	503	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	603	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	803	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	903	SOX	State Compliance achieved	02-AUG-2010	State	-
7160	1003	SOX	State Compliance achieved	02-AUG-2010	State	-
5108	105	SOX	State Compliance achieved	04-OCT-2007	State	-
5208	205	SOX	State Compliance achieved	04-OCT-2007	State	-
7108	5407	SOX	State Compliance achieved	04-OCT-2007	State	-
7008	5307	SOX	State Compliance achieved	04-OCT-2007	State	-
6908	5207	SOX	State Compliance achieved	04-OCT-2007	State	-
6808	5107	SOX	State Compliance achieved	04-OCT-2007	State	-
6708	5007	SOX	State Compliance achieved	04-OCT-2007	State	-

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All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
N OF SWTP-PINKSTON RES	33848	Yes	Intake	Surface water	Other	Inactive
INTAKE 3 - LAKE CENTER	33847	Yes	Intake	Surface water	Permanent	Active
INTAKE 2 - LAKE PINKSTON / DAM	33846	Yes	Intake	Surface water	Permanent	Active
INTAKE 1 - PINKSTON RES	33845	Yes	Intake	Surface water	Permanent	Active
RAW-TAP	117686	No	Common Headers	-	-	Active
RAW-TAP	117687	No	Common Headers	-	-	Active
RAW-TAP	117688	No	Common Headers	-	-	Active
PINKSTON PLANT - 0.5 MG - CW	148160	No	Clear Well	-	-	Active
PINKSTON PLANT - 0.5 MG - CW	148161	No	Clear Well	-	-	Active
MILL CREEK - 0.5 MG - CW	148162	No	Clear Well	-	-	Active
MILL CREEK - 0.5 MG - CW	148163	No	Clear Well	-	-	Active
DISTRIBUTION SYSTEM	45201	No	Distribution System/Zone	-	-	Active
RIGGS ST - 600 GPM - SP	130531	No	Pump Facility	-	-	Active
RIGGS ST - 600 GPM - SP	130532	No	Pump Facility	-	-	Active
TYSONS - 1100 GPM - SP	130533	No	Pump Facility	-	-	Active
MILL CREEK - 2112 GPM - BACKWASH	157608	No	Pump Facility	-	-	Active
MILL CREEK - 1260 GPM - SP	70703	No	Pump Facility	-	-	Active
PINKSTON - 2000 GPM - SP	70704	No	Pump Facility	-	-	Active
PINKSTON - 2000 GPM - SP	70705	No	Pump Facility	-	-	Active
PINKSTON - 2000 GPM - SP	70706	No	Pump Facility	-	-	Active
MILL CREEK - 1260 GPM - SP	70707	No	Pump Facility	-	-	Active
PINKSTON - 2000 GPM - BACKWASH	70708	No	Pump Facility	-	-	Active
RIGGS ST	70709	No	Pump Facility	-	-	Inactive
TYSON'S	70710	No	Pump Facility	-	-	Inactive
STORAGE TANK - 5665 TX-7 WEST; CENTER	139821	No	Sampling Station	-	-	Active
MILL CREEK SWTP - CR 1006	139822	No	Sampling Station	-	-	Active
STORAGE TANK - 5665 TX-7 WEST, CENTER	58037	No	Sampling Station	-	-	Active
1480 CR 1006, CENTER	58038	No	Sampling Station	-	-	Active
SOUTH EST - 0.25 MG - EL	168912	No	Storage	-	-	Active
RIGGS ST - 1.0 MG - GR	87784	No	Storage	-	-	Active
TYSON'S - 1.75 MG - ST	87785	No	Storage	-	-	Active
ONE MILLION GALLON PLANT- 1.0 MG - EL	87786	No	Storage	-	-	Active
HENRIETTA ST - 0.5 MG - EL	87787	No	Storage	-	-	Active
SWTP - PINKSTON	1186	No	Treatment Plant	-	-	Active
SWTP - PINKSTON/ OLD TRAIN	1187	No	Treatment Plant	-	-	Active
SWTP - MILL CREEK	4999	No	Treatment Plant	-	-	Active
ZZ	12519	No	Treatment Plant	-	-	Inactive

1 - 37 of 37

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
SWTP - PINKSTON	1186	Gaseous Chlorination, Pre	Disinfection
SWTP - PINKSTON	1186	Innovative	Disinfection
SWTP - PINKSTON	1186	Innovative	Particulate removal
SWTP - PINKSTON	1186	Innovative	Particulate removal
SWTP - PINKSTON	1186	Gaseous Chlorination, Pre	Disinfection
SWTP - PINKSTON	1186	Innovative	Particulate removal
SWTP - PINKSTON	1186	Sedimentation	Particulate removal
SWTP - PINKSTON	1186	Innovative	Particulate removal
SWTP - PINKSTON	1186	Innovative	Disinfection
SWTP - PINKSTON	1186	Innovative	Disinfection
SWTP - PINKSTON/ OLD TRAIN	1187	Gaseous Chlorination, Pre	Disinfection
SWTP - PINKSTON/ OLD TRAIN	1187	Innovative	Disinfection
SWTP - PINKSTON/ OLD TRAIN	1187	Innovative	Particulate removal
SWTP - PINKSTON/ OLD TRAIN	1187	Gaseous Chlorination, Pre	Disinfection
SWTP - PINKSTON/ OLD TRAIN	1187	Innovative	Particulate removal
SWTP - PINKSTON/ OLD TRAIN	1187	Innovative	Disinfection
SWTP - PINKSTON/ OLD TRAIN	1187	Innovative	Disinfection
SWTP - MILL CREEK	4999	Permanganate	Taste / odor control
SWTP - MILL CREEK	4999	Innovative	Particulate removal
SWTP - MILL CREEK	4999	Coagulation	Particulate removal
SWTP - MILL CREEK	4999	Innovative	Disinfection
SWTP - MILL CREEK	4999	Gaseous Chlorination, Pre	Disinfection
SWTP - MILL CREEK	4999	Innovative	Disinfection
SWTP - MILL CREEK	4999	Flocculation	Particulate removal
SWTP - MILL CREEK	4999	Innovative	Particulate removal
SWTP - MILL CREEK	4999	Innovative	Disinfection
SWTP - MILL CREEK	4999	pH Adjustment, Pre	Organics removal
SWTP - MILL CREEK	4999	Gaseous Chlorination, Pre	Disinfection
SWTP - MILL CREEK	4999	Innovative	Particulate removal
SWTP - MILL CREEK	4999	Innovative	Disinfection
SWTP - MILL CREEK	4999	Innovative	Other
SWTP - MILL CREEK	4999	Innovative	Other
SWTP - MILL CREEK	4999	Innovative	Disinfection
SWTP - MILL CREEK	4999	Innovative	Disinfection
SWTP - MILL CREEK	4999	Innovative	Disinfection

1 - 35 of 35

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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