Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	OK2005111
PWS Name	HASKELL PWA-WELLS
PWS Type	Community water system
Owner Type	Local government
Primary Source	Ground water
Primacy Type	State
Is Wholesaler?	No
Population Served	1765
County Served	Muskogee

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
TT	LSL Inventory	Lead and Copper Rule Revisions	LEAD AND COPPER RULE REVISIONS	169464	Open	17-OCT-2024	-	Yes
RPT	LSL Reporting	Lead and Copper Rule Revisions	LEAD AND COPPER RULE REVISIONS	169465	Open	17-OCT-2024	-	No
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	169458	Returned to Compliance	02-OCT-2022	-	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	169451	Returned to Compliance	01-OCT-2017	31-DEC-2017	No
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	169446	Returned to Compliance	01-OCT-2015	-	No
MR	Monitoring, Routine (IDSE)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	169442	Returned to Compliance	01-FEB-2011	30-APR-2011	No
MR	Monitoring, Routine (IDSE)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	169441	Returned to Compliance	01-FEB-2011	30-APR-2011	No
MR	Failure Submit IDSE/Subpart V Plan Rpt	Stage 2 Disinfectants and Disinfection Byproducts Rule	Stage 2 Disinfectants and Disinfection Byproducts Rule	169440	Returned to Compliance	01-OCT-2010	-	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	169419	Returned to Compliance	01-JUL-2008	31-JUL-2008	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	169418	Returned to Compliance	01-JAN-2008	31-MAR-2008	Yes
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Uranium	169448	Returned to Compliance	01-JAN-2008	31-DEC-2016	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	169449	Returned to Compliance	01-JAN-2008	31-DEC-2016	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Beta Particle Activity	169450	Returned to Compliance	01-JAN-2008	31-DEC-2016	No
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	169416	Returned to Compliance	01-JAN-2008	-	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	169447	Returned to Compliance	01-JAN-2008	31-DEC-2016	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	169415	Returned to Compliance	01-OCT-2007	31-DEC-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	169412	Returned to Compliance	01-JUL-2007	30-SEP-2007	Yes
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	169417	Returned to Compliance	01-JUL-2007	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	169431	Returned to Compliance	01-APR-2007	30-JUN-2007	Yes
MR	Monitoring, Regular	Nitrate Rule	Nitrate-Nitrite	169414	Returned to Compliance	01-JAN-2007	31-DEC-2007	No
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	169432	Returned to Compliance	01-JUL-2005	-	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	168605	Returned to Compliance	01-APR-2005	30-APR-2005	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	168305	Returned to Compliance	01-SEP-2004	30-SEP-2004	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	168205	Returned to Compliance	01-JUL-2004	31-JUL-2004	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	168505	Returned to Compliance	01-JAN-2004	31-DEC-2004	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	168405	Returned to Compliance	01-JAN-2004	31-DEC-2004	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Beta Particle Activity	168103	Returned to Compliance	01-APR-2003	30-JUN-2003	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	168003	Returned to Compliance	01-APR-2003	30-JUN-2003	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	167903	Returned to Compliance	01-APR-2003	30-JUN-2003	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2,4-Trichlorobenzene	165501	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	165601	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Xylenes, Total	165701	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	DICHLOROMETHANE	165801	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	165901	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	p-Dichlorobenzene	166001	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Vinyl chloride	166101	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1-Dichloroethylene	166201	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	167501	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	167401	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	167301	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	167201	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	167101	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	167001	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	166901	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	166801	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	166701	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	166601	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	166501	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Regular	Volatile Organic Chemicals	trans-1,2-Dichloroethylene	166401	Returned to Compliance	01-JAN-2001	31-MAR-2001	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	2897	Returned to Compliance	01-OCT-1996	31-OCT-1996	No

1 - 50 of 57

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
9194403	169464	SIA	State Violation/Reminder Notice	11-JUL-2025	State	-
9194404	169465	SIA	State Violation/Reminder Notice	11-JUL-2025	State	-
9194402	169458	SOX	State Compliance achieved	09-FEB-2023	State	-
9194398	169450	SOX	State Compliance achieved	10-AUG-2021	State	rtc
9194398	169449	SOX	State Compliance achieved	10-AUG-2021	State	rtc
9194398	169448	SOX	State Compliance achieved	10-AUG-2021	State	rtc
9194398	169447	SOX	State Compliance achieved	10-AUG-2021	State	rtc
9194393	169451	SIF	State Public Notification received	21-OCT-2019	State	Distributed with CCR
9194387	169446	SOX	State Compliance achieved	27-FEB-2018	State	RTC 2018.2.27
9194380	167903	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194360	167501	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194361	167401	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194359	167301	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194379	168103	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194381	168003	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194364	167201	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194374	167101	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194376	167001	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194371	166901	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194377	166801	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194375	166701	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194357	2897	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194352	3492	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194355	35595	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194353	39493	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194351	60091	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194356	88296	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194354	89694	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194369	165501	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194365	165601	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194366	165701	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194367	165801	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194362	165901	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194358	166001	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194368	166101	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194363	166201	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194378	166401	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194372	166501	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
9194373	166601	SOX	State Compliance achieved	04-AUG-2016	State	AUTOMATIC RETURN TO COMPLIANCE 8/4/2016 - Violations Should be Closed Out because PWS is in complaince.
#F9194338	169442	SOX	State Compliance achieved	25-APR-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.
#F9194338	169441	SOX	State Compliance achieved	25-APR-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.
#F9194338	169440	SOX	State Compliance achieved	25-APR-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.
9194331	169432	SOX	State Compliance achieved	17-SEP-2010	State	9.17.10 -- per MW ok to SOX 7-12/05, 1-6/-7 and 7-12/07 Tap PbCu M/R violations because these violations were during period DEQ not sure PWS knew of biannual Tap PbCu requirement (some confusion over what PWS was told when ALE started occuring -- SM
9194331	169417	SOX	State Compliance achieved	17-SEP-2010	State	9.17.10 -- per MW ok to SOX 7-12/05, 1-6/-7 and 7-12/07 Tap PbCu M/R violations because these violations were during period DEQ not sure PWS knew of biannual Tap PbCu requirement (some confusion over what PWS was told when ALE started occuring -- SM
9194331	169416	SOX	State Compliance achieved	17-SEP-2010	State	9.17.10 -- per MW ok to SOX 7-12/05, 1-6/-7 and 7-12/07 Tap PbCu M/R violations because these violations were during period DEQ not sure PWS knew of biannual Tap PbCu requirement (some confusion over what PWS was told when ALE started occuring -- SM
9194326	169419	SOX	State Compliance achieved	29-SEP-2008	State	-
9194317	169431	SOX	State Compliance achieved	26-JUN-2008	State	SYSTEM IN COMPLIANCE WITH HAA5 MCL AT END OF 2Q2008. PN ACHIEVED AND RESPONSE TO NOVS COMPLETE.
9194317	169418	SOX	State Compliance achieved	26-JUN-2008	State	SYSTEM IN COMPLIANCE WITH HAA5 MCL AT END OF 2Q2008. PN ACHIEVED AND RESPONSE TO NOVS COMPLETE.
9194317	169415	SOX	State Compliance achieved	26-JUN-2008	State	SYSTEM IN COMPLIANCE WITH HAA5 MCL AT END OF 2Q2008. PN ACHIEVED AND RESPONSE TO NOVS COMPLETE.
9194317	169412	SOX	State Compliance achieved	26-JUN-2008	State	SYSTEM IN COMPLIANCE WITH HAA5 MCL AT END OF 2Q2008. PN ACHIEVED AND RESPONSE TO NOVS COMPLETE.

1 - 50 of 57

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
CC MUSKOGEE EMERGENCY CONNECT	26121	Yes	Consecutive Connection	Surface water	Emergency	Active
WELL #22	13908	Yes	Well	Ground water	Seasonal	Inactive
WELL #31	13898	Yes	Well	Ground water	Seasonal	Inactive
WELL #30	13894	Yes	Well	Ground water	Seasonal	Inactive
WELL #28	13893	Yes	Well	Ground water	Seasonal	Inactive
WELL #24	13888	Yes	Well	Ground water	Seasonal	Inactive
WELL #32	13885	Yes	Well	Ground water	Seasonal	Inactive
WELL #29	13880	Yes	Well	Ground water	Seasonal	Inactive
WELL #4	13901	Yes	Well	Ground water	Seasonal	Active
WELL #7	13887	Yes	Well	Ground water	Seasonal	Active
WELL #17	13883	Yes	Well	Ground water	Seasonal	Active
WELL #3	13882	Yes	Well	Ground water	Seasonal	Active
WELL #26	13899	Yes	Well	Ground water	Permanent	Inactive
WELL #25	13891	Yes	Well	Ground water	Permanent	Inactive
WELL #27	13884	Yes	Well	Ground water	Permanent	Inactive
WELL #8	13911	Yes	Well	Ground water	Permanent	Active
WELL #13	13910	Yes	Well	Ground water	Permanent	Active
WELL #19	13907	Yes	Well	Ground water	Permanent	Active
WELL #5	13906	Yes	Well	Ground water	Permanent	Active
WELL #12	13905	Yes	Well	Ground water	Permanent	Active
WELL #1	13904	Yes	Well	Ground water	Permanent	Active
WELL #9	13902	Yes	Well	Ground water	Permanent	Active
WELL #6	13900	Yes	Well	Ground water	Permanent	Active
WELL #10	13897	Yes	Well	Ground water	Permanent	Active
WELL #2	13896	Yes	Well	Ground water	Permanent	Active
WELL #16	13895	Yes	Well	Ground water	Permanent	Active
WELL #15	13892	Yes	Well	Ground water	Permanent	Active
WELL #11	13890	Yes	Well	Ground water	Permanent	Active
WELL #14	13886	Yes	Well	Ground water	Permanent	Active
WELL #18	13881	Yes	Well	Ground water	Permanent	Active
WELL #23	13909	Yes	Well	Ground water	Interim	Inactive
WELL #21	13903	Yes	Well	Ground water	Interim	Inactive
WELL #20	13889	Yes	Well	Ground water	Interim	Inactive
DISTRIBUTION SYSTEM	18086	No	Distribution System/Zone	-	-	Active
MAIN PUMPHOUSE	30883	No	Pump Facility	-	-	Active
BOOSTER PUMP	30884	No	Pump Facility	-	-	Active
WELLS 1-32	19958	No	Sampling Station	-	-	Active
BIG TOWER	30885	No	Storage	-	-	Active
SMALL TOWER	30886	No	Storage	-	-	Active
CHLORINATION STATION	23732	No	Treatment Plant	-	-	Active

1 - 40 of 40

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
CHLORINATION STATION	23732	Hypochlorination, Post	Disinfection

1 - 1 of 1

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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