Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	TX0230001
PWS Name	SILVERTON MUNICIPAL WATER SYSTEM
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water purchased
Primacy Type	State
Is Wholesaler?	No
Population Served	597
County Served	Briscoe

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
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041434	Known	01-OCT-2025	31-DEC-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041427	Known	01-JUL-2025	30-SEP-2025	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	90041425	Returned to Compliance	01-APR-2025	30-JUN-2025	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041421	Known	01-APR-2025	30-JUN-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041418	Known	01-JAN-2025	31-MAR-2025	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	90041420	Returned to Compliance	01-JAN-2025	31-MAR-2025	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041411	Known	01-OCT-2024	31-DEC-2024	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041410	Known	01-JUL-2024	30-SEP-2024	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041406	Known	01-APR-2024	30-JUN-2024	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041403	Known	01-JAN-2024	31-MAR-2024	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041399	Known	01-OCT-2023	31-DEC-2023	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041395	Known	01-JUL-2023	30-SEP-2023	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	90041387	Returned to Compliance	09-APR-2023	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041391	Returned to Compliance	01-APR-2023	30-JUN-2023	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041386	Returned to Compliance	01-JAN-2023	31-MAR-2023	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041382	Returned to Compliance	01-OCT-2022	31-DEC-2022	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041376	Returned to Compliance	01-JUL-2022	30-SEP-2022	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041367	Returned to Compliance	01-APR-2022	30-JUN-2022	Yes
MR	Failure Submit IDSE/Subpart V Plan Rpt	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041363	Returned to Compliance	02-MAR-2022	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041362	Known	01-JAN-2022	31-MAR-2022	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041357	Known	01-OCT-2021	31-DEC-2021	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041353	Returned to Compliance	01-JUL-2021	30-SEP-2021	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041354	Known	01-JUL-2021	30-SEP-2021	Yes
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	90041350	Returned to Compliance	01-JUL-2021	-	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	90041349	Returned to Compliance	01-OCT-2020	31-DEC-2020	No
MR	Lead Consumer Notice	Lead and Copper Rule	Lead and Copper Rule	90041346	Returned to Compliance	30-DEC-2019	-	No
Other	Public Notification Violation without NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	90041345	Returned to Compliance	31-MAR-2019	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	90041329	Returned to Compliance	01-JUL-2017	30-SEP-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	90041328	Returned to Compliance	01-JUL-2017	30-SEP-2017	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	90041331	Returned to Compliance	01-JUL-2017	30-SEP-2017	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041330	Returned to Compliance	01-JUL-2017	30-SEP-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041327	Returned to Compliance	01-JUL-2017	30-SEP-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	90041315	Returned to Compliance	01-APR-2017	30-JUN-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041316	Returned to Compliance	01-APR-2017	30-JUN-2017	Yes
MON	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	90041326	Returned to Compliance	01-MAR-2017	31-MAR-2017	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	90041291	Returned to Compliance	02-JAN-2017	-	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	90041290	Returned to Compliance	02-JAN-2017	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	90041296	Returned to Compliance	01-JAN-2017	31-MAR-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041298	Returned to Compliance	01-JAN-2017	31-MAR-2017	Yes
MR	Lead Consumer Notice	Lead and Copper Rule	Lead and Copper Rule	90041281	Returned to Compliance	30-DEC-2016	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	90041280	Returned to Compliance	01-OCT-2016	31-DEC-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041277	Returned to Compliance	01-OCT-2016	31-DEC-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041268	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)	90041265	Returned to Compliance	01-JUL-2016	30-SEP-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041255	Returned to Compliance	01-APR-2016	30-JUN-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041256	Returned to Compliance	01-APR-2016	30-JUN-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	90041253	Returned to Compliance	01-APR-2016	30-JUN-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	90041254	Returned to Compliance	01-APR-2016	30-JUN-2016	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	90041248	Returned to Compliance	08-FEB-2016	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	90041247	Returned to Compliance	01-JAN-2016	31-MAR-2016	Yes

1 - 50 of 73

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
90092873	90041427	SIF	State Public Notification received	17-DEC-2025	State	-
90092874	90041425	SIF	State Public Notification received	17-DEC-2025	State	-
90092864	90041420	SOX	State Compliance achieved	01-OCT-2025	State	20251001. EPAYNE. SOX BASED ON 3Q2025 MAILED ON TIME WITH NO ISSUES.
90092861	90041421	SIF	State Public Notification received	03-SEP-2025	State	-
90092854	90041418	SIF	State Public Notification received	01-JUL-2025	State	-
90092848	90041411	SIF	State Public Notification received	03-FEB-2025	State	-
90092842	90041410	SIF	State Public Notification received	04-OCT-2024	State	-
90092841	90041391	SOX	State Compliance achieved	26-SEP-2024	State	20240926 EBAUCOM; VIOLS SOX'D BASED ON TTHM DBP2-01 3Q2024 LRAAS
90092841	90041386	SOX	State Compliance achieved	26-SEP-2024	State	20240926 EBAUCOM; VIOLS SOX'D BASED ON TTHM DBP2-01 3Q2024 LRAAS
90092841	90041382	SOX	State Compliance achieved	26-SEP-2024	State	20240926 EBAUCOM; VIOLS SOX'D BASED ON TTHM DBP2-01 3Q2024 LRAAS
90092841	90041376	SOX	State Compliance achieved	26-SEP-2024	State	20240926 EBAUCOM; VIOLS SOX'D BASED ON TTHM DBP2-01 3Q2024 LRAAS
90092841	90041367	SOX	State Compliance achieved	26-SEP-2024	State	20240926 EBAUCOM; VIOLS SOX'D BASED ON TTHM DBP2-01 3Q2024 LRAAS
90092841	90041353	SOX	State Compliance achieved	26-SEP-2024	State	20240926 EBAUCOM; VIOLS SOX'D BASED ON TTHM DBP2-01 3Q2024 LRAAS
90092837	90041387	SOX	State Compliance achieved	20-AUG-2024	State	-
90092838	90041363	SIF	State Public Notification received	20-AUG-2024	State	-
90092835	90041406	SIF	State Public Notification received	15-JUL-2024	State	-
90092829	90041403	SIE	State Public Notification requested	05-APR-2024	State	-
90092825	90041399	SIE	State Public Notification requested	05-DEC-2023	State	-
90092820	90041395	SIF	State Public Notification received	08-SEP-2023	State	-
90092800	90041354	SFO	State Administrative/Compliance Order with penalty issued	17-JAN-2023	State	TCEQ DOCKET NO. 2022-0474-PWS-E. FINAL TR DUE DATE 11/10/2026
90092800	90041357	SFO	State Administrative/Compliance Order with penalty issued	17-JAN-2023	State	TCEQ DOCKET NO. 2022-0474-PWS-E. FINAL TR DUE DATE 11/10/2026
90092800	90041362	SFO	State Administrative/Compliance Order with penalty issued	17-JAN-2023	State	TCEQ DOCKET NO. 2022-0474-PWS-E. FINAL TR DUE DATE 11/10/2026
90092766	90041345	SOX	State Compliance achieved	27-DEC-2021	State	-
90092759	90041350	SOX	State Compliance achieved	21-OCT-2021	State	-
90092753	90041349	SOX	State Compliance achieved	24-JUN-2021	State	20210624. GGUITZKO. SOX APPLIED BASED ON 1Q2021 RECEIVED ON TIME AND WITH NO ISSUES.
90092752	90041346	SOX	State Compliance achieved	15-JUN-2021	State	ADEQUATE 2019 LCN REC'D 06/15/2021-MR
90092727	90041331	SIF	State Public Notification received	19-MAR-2018	State	-
90092723	90041232	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041330	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041329	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041328	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041327	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041316	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041315	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041298	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041296	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041280	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041277	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041268	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041265	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041256	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041255	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041254	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041253	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041210	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041212	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041213	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041216	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041222	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS
90092723	90041225	SOX	State Compliance achieved	05-DEC-2017	State	12/21/17; SOX'D TTHM AND HAA5 DBP2-01 AND -02 VIOLATIONS BASED ON 4Q2017 LRAAS

1 - 50 of 72

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
SW FROM MACKENZIE MWA	34428	Yes	Consecutive Connection	Surface water	Permanent	Active
E OF 1	28391	Yes	Well	Ground water	Permanent	Active
N OF 4	28380	Yes	Well	Ground water	Permanent	Active
500' N OF 2	28378	Yes	Well	Ground water	Permanent	Active
DAVIS 1	63970	Yes	Well	Ground water	Other	Inactive
3 - CITY HALL	28349	Yes	Well	Ground water	Other	Inactive
1 - CITY HALL	28327	Yes	Well	Ground water	Other	Inactive
DAVIS 2	63971	Yes	Well	Ground water	Emergency	Active
DAVIS WELL / W SIDE OF CITY	28443	Yes	Well	Ground water	Emergency	Active
STRANGE	28387	Yes	Well	Ground water	Emergency	Active
MARTIN	28385	Yes	Well	Ground water	Emergency	Active
0.5 MI SW OF 2	28379	Yes	Well	Ground water	Emergency	Active
1.73 MI E OF NE CORNER OF CITY	28370	Yes	Well	Ground water	Emergency	Active
DISTRIBUTION SYSTEM	36175	No	Distribution System/Zone	-	-	Active
PS 1 - 500 GPM - SP	116565	No	Pump Facility	-	-	Active
PS 1 - 500 GPM - SP	116566	No	Pump Facility	-	-	Active
CR 12 / LION ST; SILVERTON	133519	No	Sampling Station	-	-	Active
CR L / E OF RR 3365; SILVERTON	141618	No	Sampling Station	-	-	Active
CR L / E OF RR 3365, SILVERTON	48759	No	Sampling Station	-	-	Active
CR 12 / LION ST, SILVERTON	48760	No	Sampling Station	-	-	Active
EP002	60045	No	Sampling Station	-	-	Inactive
SAMPLE TAP / STRANGE WELL	61777	No	Sampling Station	-	-	Inactive
SAMPLE TAP / AQUIFER	62328	No	Sampling Station	-	-	Inactive
SAMPLE TAP	64295	No	Sampling Station	-	-	Inactive
0.25 MG GST	107059	No	Storage	-	-	Active
PS 1 - 0.075 MG - EL	116567	No	Storage	-	-	Active
PS 1 - 0.25 MG - GR	116568	No	Storage	-	-	Active
BROOKS WELLS PIPELINE	1577	No	Treatment Plant	-	-	Active
PLANT - MACKENZIE MWS / DAVIS 2	4753	No	Treatment Plant	-	-	Active
STRANGE WELL	10006	No	Treatment Plant	-	-	Inactive
MARTIN PLANT	11681	No	Treatment Plant	-	-	Inactive
DAVIS WELL PLANT	3170	No	Treatment Plant	-	-	Inactive
PLANT	63466	No	Treatment Plant	-	-	Inactive

1 - 33 of 33

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
STRANGE WELL	10006	Hypochlorination, Pre	Disinfection
BROOKS WELLS PIPELINE	1577	Chloramines	Disinfection
DAVIS WELL PLANT	3170	Hypochlorination, Pre	Disinfection
PLANT - MACKENZIE MWS / DAVIS 2	4753	Chloramines	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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