Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	OK1010848
PWS Name	MARSHALL COUNTY RURAL WATER DISTRICT #2
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water
Primacy Type	State
Is Wholesaler?	No
Population Served	17587
County Served	Marshall

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	69974	Known	01-JUL-2025	30-SEP-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69973	Known	01-JUL-2025	30-SEP-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69971	Known	01-JUL-2025	30-SEP-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69972	Known	01-JUL-2025	30-SEP-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69968	Known	01-APR-2025	30-JUN-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69969	Known	01-APR-2025	30-JUN-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69966	Known	01-APR-2025	30-JUN-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69967	Known	01-APR-2025	30-JUN-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69963	Known	01-JAN-2025	31-MAR-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69961	Known	01-JAN-2025	31-MAR-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69964	Known	01-JAN-2025	31-MAR-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69962	Known	01-JAN-2025	31-MAR-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69958	Known	01-OCT-2024	31-DEC-2024	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69959	Known	01-OCT-2024	31-DEC-2024	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69960	Known	01-OCT-2024	31-DEC-2024	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69957	Known	01-OCT-2024	31-DEC-2024	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69955	Known	01-JUL-2024	30-SEP-2024	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69956	Known	01-JUL-2024	30-SEP-2024	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69953	Known	01-APR-2023	30-JUN-2023	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69952	Known	01-JAN-2023	31-MAR-2023	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69950	Known	01-JAN-2023	31-MAR-2023	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69951	Known	01-JAN-2023	31-MAR-2023	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69948	Known	01-OCT-2022	31-DEC-2022	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69949	Known	01-OCT-2022	31-DEC-2022	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69947	Known	01-JUL-2022	30-SEP-2022	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69946	Known	01-JUL-2022	30-SEP-2022	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69945	Known	01-JUL-2022	30-SEP-2022	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69944	Known	01-APR-2022	30-JUN-2022	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69943	Known	01-JAN-2022	31-MAR-2022	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	69931	Returned to Compliance	01-APR-2019	30-JUN-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	69928	Returned to Compliance	01-JAN-2019	31-MAR-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	69930	Returned to Compliance	01-JAN-2019	31-MAR-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	69929	Returned to Compliance	01-JAN-2019	31-MAR-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	69848	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)	69828	Returned to Compliance	01-OCT-2015	31-DEC-2015	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69819	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)	69816	Returned to Compliance	01-JUL-2015	30-SEP-2015	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69800	Returned to Compliance	01-APR-2015	30-JUN-2015	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	69798	Returned to Compliance	01-APR-2015	30-JUN-2015	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69792	Returned to Compliance	01-JAN-2015	31-MAR-2015	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	69714	Returned to Compliance	01-AUG-2011	31-AUG-2011	Yes
MR	Monitoring, Repeat Major (TCR)	Total Coliform Rule	Coliform (TCR)	69715	Returned to Compliance	01-AUG-2011	31-AUG-2011	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	69711	Returned to Compliance	01-JAN-2010	31-MAR-2010	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	69705	Returned to Compliance	01-OCT-2009	31-DEC-2009	Yes
MR	Monitoring, Routine (IDSE)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	69741	Returned to Compliance	01-DEC-2008	31-JAN-2009	No
MR	Monitoring, Routine (IDSE)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	69740	Returned to Compliance	01-DEC-2008	31-JAN-2009	No
TT	Monthly Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	69506	Returned to Compliance	01-MAY-2006	31-MAY-2006	Yes
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	69606	Returned to Compliance	01-APR-2006	30-JUN-2006	Yes
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	69406	Returned to Compliance	01-JAN-2006	31-MAR-2006	Yes
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	69306	Returned to Compliance	01-OCT-2005	31-DEC-2005	Yes

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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
3599	69974	SIE	State Public Notification requested	09-DEC-2025	State	-
3599	69973	SIE	State Public Notification requested	09-DEC-2025	State	-
3599	69971	SIE	State Public Notification requested	09-DEC-2025	State	-
3599	69972	SIE	State Public Notification requested	09-DEC-2025	State	-
3596	69969	SIE	State Public Notification requested	20-AUG-2025	State	-
3596	69968	SIE	State Public Notification requested	20-AUG-2025	State	-
3596	69967	SIE	State Public Notification requested	20-AUG-2025	State	-
3596	69966	SIE	State Public Notification requested	20-AUG-2025	State	-
3594	69964	SIF	State Public Notification received	30-JUN-2025	State	-
3594	69961	SIF	State Public Notification received	30-JUN-2025	State	-
3594	69962	SIF	State Public Notification received	30-JUN-2025	State	-
3594	69963	SIF	State Public Notification received	30-JUN-2025	State	-
3591	69957	SIF	State Public Notification received	24-MAR-2025	State	-
3591	69958	SIF	State Public Notification received	24-MAR-2025	State	-
3591	69959	SIF	State Public Notification received	24-MAR-2025	State	-
3591	69960	SIF	State Public Notification received	24-MAR-2025	State	-
3588	69955	SIF	State Public Notification received	25-NOV-2024	State	-
3588	69956	SIF	State Public Notification received	25-NOV-2024	State	-
3585	69953	SIF	State Public Notification received	11-SEP-2023	State	-
3584	69950	SIF	State Public Notification received	09-AUG-2023	State	-
3584	69951	SIF	State Public Notification received	09-AUG-2023	State	-
3584	69952	SIF	State Public Notification received	09-AUG-2023	State	-
3579	69949	SFO	State Administrative/Compliance Order with penalty issued	18-MAY-2023	State	Stage 2 TTHM MCL Violations.
3579	69948	SFO	State Administrative/Compliance Order with penalty issued	18-MAY-2023	State	Stage 2 TTHM MCL Violations.
3579	69947	SFO	State Administrative/Compliance Order with penalty issued	18-MAY-2023	State	Stage 2 TTHM MCL Violations.
3579	69946	SFO	State Administrative/Compliance Order with penalty issued	18-MAY-2023	State	Stage 2 TTHM MCL Violations.
3579	69945	SFO	State Administrative/Compliance Order with penalty issued	18-MAY-2023	State	Stage 2 TTHM MCL Violations.
3579	69943	SFO	State Administrative/Compliance Order with penalty issued	18-MAY-2023	State	Stage 2 TTHM MCL Violations.
3579	69944	SFO	State Administrative/Compliance Order with penalty issued	18-MAY-2023	State	Stage 2 TTHM MCL Violations.
3566	69931	SOX	State Compliance achieved	15-MAY-2020	State	1Q2019 & 2Q2019 HAA5 MCL; closed due to system achieving compliance.
3566	69930	SOX	State Compliance achieved	15-MAY-2020	State	1Q2019 & 2Q2019 HAA5 MCL; closed due to system achieving compliance.
3566	69929	SOX	State Compliance achieved	15-MAY-2020	State	1Q2019 & 2Q2019 HAA5 MCL; closed due to system achieving compliance.
3566	69928	SOX	State Compliance achieved	15-MAY-2020	State	1Q2019 & 2Q2019 HAA5 MCL; closed due to system achieving compliance.
3557	69848	SOX	State Compliance achieved	11-JAN-2017	State	-
3556	69828	SOX	State Compliance achieved	11-JAN-2017	State	-
3555	69819	SOX	State Compliance achieved	11-JAN-2017	State	-
3555	69816	SOX	State Compliance achieved	11-JAN-2017	State	-
3554	69800	SOX	State Compliance achieved	11-JAN-2017	State	-
3553	69792	SOX	State Compliance achieved	11-JAN-2017	State	-
3554	69798	SOX	State Compliance achieved	11-JAN-2017	State	-
3549	66497	SOX	State Compliance achieved	25-JUL-2016	State	AUTOMATIC RETURN TO COMPLIANCE 7/25/2016 - Violations Should be Closed Out because PWS is in complaince.
#F3531	69741	SOX	State Compliance achieved	08-MAY-2014	ODSWeb	Entered by EPA Region 6 to address ODS incorrect Validation Error ERR00043 - Y5000 was rejected because the water system does not have a Violation matching the Y5000 ID.
#F3532	69740	SOX	State Compliance achieved	08-MAY-2014	ODSWeb	Entered by EPA Region 6 to address ODS incorrect Validation Error ERR00043 - Y5000 was rejected because the water system does not have a Violation matching the Y5000 ID.
3529	69715	SIF	State Public Notification received	02-NOV-2011	State	-
3529	69714	SIF	State Public Notification received	02-NOV-2011	State	-
3535	69705	SOX	State Compliance achieved	17-MAY-2010	State	-
3521	69711	SOX	State Compliance achieved	17-MAY-2010	State	TTHM MCL IN COMPLIANCE PN RESPONSE TO NOV ACHIEVED
3509	69306	SOX	State Compliance achieved	17-AUG-2007	State	IN COMPLIANCE WITH TTHM & TOC TT - PN & RESPONSE TO NOV ACHIEVED.
3509	69206	SOX	State Compliance achieved	17-AUG-2007	State	IN COMPLIANCE WITH TTHM & TOC TT - PN & RESPONSE TO NOV ACHIEVED.
3509	69106	SOX	State Compliance achieved	17-AUG-2007	State	IN COMPLIANCE WITH TTHM & TOC TT - PN & RESPONSE TO NOV ACHIEVED.

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All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
CITY OF MADILL (EMERGENCY CC)	27561	Yes	Consecutive Connection	Surface water	Emergency	Active
WELL 5	29331	Yes	Well	Ground water	Permanent	Inactive
WELL 4	29330	Yes	Well	Ground water	Permanent	Inactive
REX SMITH WELL #1	29082	Yes	Well	Ground water	Permanent	Inactive
WELL 2	25119	Yes	Well	Ground water	Emergency	Inactive
WELL 1	25118	Yes	Well	Ground water	Emergency	Inactive
LAKE REX SMITH RESERVOIR	27560	Yes	Reservoir	Surface water	Permanent	Inactive
OTEKA LAKE RESERVOIR	27559	Yes	Reservoir	Surface water	Permanent	Inactive
LAKE REX SMITH INTAKE	20421	Yes	Intake	Surface water	Permanent	Active
LAKE OTEKA INTAKE	15693	Yes	Intake	Surface water	Permanent	Active
OTEKA CLEAR WELL	27564	No	Clear Well	-	-	Inactive
REX SMITH CLEAR WELL 1	27565	No	Clear Well	-	-	Inactive
REX SMITH CLEAR WELL 2	27566	No	Clear Well	-	-	Inactive
REX SMITH CLEAR WELL 3	27567	No	Clear Well	-	-	Inactive
DISTRIBUTION SYSTEM	17222	No	Distribution System/Zone	-	-	Active
SIMPSON BOOSTER STATION	29754	No	Pump Facility	-	-	Active
OTEKA RAW WATER PUMP STATION	30697	No	Pump Facility	-	-	Active
REX RAW WATER PUMP STATION	30698	No	Pump Facility	-	-	Active
WEST PUMP STATION	30699	No	Pump Facility	-	-	Active
OTEKA BACKWASH	27562	No	Surface Impoundment	-	-	Inactive
REX SMITH BACKWASH	27563	No	Surface Impoundment	-	-	Inactive
POE01 - LAKE OTEKA WTP	22298	No	Sampling Station	-	-	Active
POE02 - REX SMITH WTP	22613	No	Sampling Station	-	-	Active
TOC RAW - LAKE REX SMITH PLANT	23094	No	Sampling Station	-	-	Active
TOC RAW - LAKE OTEKA PLANT	23088	No	Sampling Station	-	-	Inactive
S. MADILL #1 STORAGE TANK	27568	No	Storage	-	-	Active
S. OTEKA STORAGE TANK	27570	No	Storage	-	-	Active
LEBANON/POWELL STORAGE TANK	27571	No	Storage	-	-	Active
WILLIS STORAGE TANK	27572	No	Storage	-	-	Active
SHAY STORAGE TANK	27574	No	Storage	-	-	Active
BUCKHILL STORAGE TANK	27575	No	Storage	-	-	Active
SIMPSON STORAGE TANK	27576	No	Storage	-	-	Active
CITY OF MADILL STORAGE TANK	27579	No	Storage	-	-	Active
LITTLE CITY STORAGE TANK	27580	No	Storage	-	-	Active
CUMBERLAND STORAGE TANK	27581	No	Storage	-	-	Active
KNOB HILL STORAGE TANK	27582	No	Storage	-	-	Active
FOUR CORNERS STORAGE TANK	27583	No	Storage	-	-	Active
CANEY CREEK STORAGE TANK	27584	No	Storage	-	-	Active
ALBERTA CREEK STORAGE TANK	27585	No	Storage	-	-	Active
JERRYS STORAGE TANK	29753	No	Storage	-	-	Active
TIMBER RIDGE	30008	No	Storage	-	-	Active
S. MADILL #2 STORAGE TANK	27569	No	Storage	-	-	Inactive
ENOS STORAGE TANK	27573	No	Storage	-	-	Inactive
GODDARD STORAGE TANK	27577	No	Storage	-	-	Inactive
N. MADILL STORAGE TANK	27578	No	Storage	-	-	Inactive
OAKRIDGE SUBDIVISION STORAGE TANK	29752	No	Storage	-	-	Inactive
MARSHALL CO WATER CORP - REX SMITH PLANT	20422	No	Treatment Plant	-	-	Active
MARSHALL CO WATER CORP LAKE OTEKA WTP	10849	No	Treatment Plant	-	-	Inactive
CL2 STATION WELL 1	25120	No	Treatment Plant	-	-	Inactive
CL2 STATION WELL 2	25121	No	Treatment Plant	-	-	Inactive

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Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
MARSHALL CO WATER CORP LAKE OTEKA WTP	10849	Coagulation	Particulate removal
MARSHALL CO WATER CORP LAKE OTEKA WTP	10849	Gaseous Chlorination, Post	Disinfection
MARSHALL CO WATER CORP LAKE OTEKA WTP	10849	Lime - Soda Ash Addition	Disinfection by-products control
MARSHALL CO WATER CORP LAKE OTEKA WTP	10849	Flocculation	Particulate removal
MARSHALL CO WATER CORP LAKE OTEKA WTP	10849	Sludge Treatment	Particulate removal
MARSHALL CO WATER CORP LAKE OTEKA WTP	10849	Sedimentation	Particulate removal
MARSHALL CO WATER CORP LAKE OTEKA WTP	10849	Sludge Treatment	Particulate removal
MARSHALL CO WATER CORP LAKE OTEKA WTP	10849	Filtration, Rapid Sand	Particulate removal
MARSHALL CO WATER CORP LAKE OTEKA WTP	10849	Sequestration	Corrosion control
MARSHALL CO WATER CORP - REX SMITH PLANT	20422	Filtration, Rapid Sand	Inorganics removal
MARSHALL CO WATER CORP - REX SMITH PLANT	20422	Sedimentation	Inorganics removal
MARSHALL CO WATER CORP - REX SMITH PLANT	20422	Hypochlorination, Post	Disinfection
MARSHALL CO WATER CORP - REX SMITH PLANT	20422	Coagulation	Particulate removal
MARSHALL CO WATER CORP - REX SMITH PLANT	20422	Sedimentation	Particulate removal
MARSHALL CO WATER CORP - REX SMITH PLANT	20422	Sludge Treatment	Particulate removal
MARSHALL CO WATER CORP - REX SMITH PLANT	20422	Chlorine Dioxide	Disinfection by-products control
CL2 STATION WELL 1	25120	Hypochlorination, Post	Disinfection
CL2 STATION WELL 2	25121	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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