Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	NN0403010
PWS Name	Cameron NTUA
PWS Type	Community water system
Owner Type	Tribal Government
Primary Source	Ground water
Primacy Type	Tribal
Is Wholesaler?	No
Population Served	742
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	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	040301052500012024	Returned to Compliance	01-JAN-2024	-	No
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	040301052500012021	Returned to Compliance	01-JAN-2021	-	No
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	040301052500012020	Returned to Compliance	01-JAN-2020	-	No
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	040301052500072016	Returned to Compliance	01-JUL-2016	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	0403010022950102015	Returned to Compliance	01-OCT-2015	31-DEC-2015	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	040301002295072015	Returned to Compliance	01-JUL-2015	30-SEP-2015	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	040301075750072015	Returned to Compliance	01-JUL-2015	-	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	040301027245672015	Returned to Compliance	01-JUL-2015	30-SEP-2015	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	040301027295072015	Returned to Compliance	01-JUL-2015	30-SEP-2015	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	040301027295042015	Returned to Compliance	01-APR-2015	30-JUN-2015	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	040301002295042015	Returned to Compliance	01-APR-2015	30-JUN-2015	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	040301075750042015	Returned to Compliance	01-APR-2015	-	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	040301027245642015	Returned to Compliance	01-APR-2015	30-JUN-2015	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	040301002295012015	Returned to Compliance	01-JAN-2015	31-MAR-2015	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	040301075750012015	Returned to Compliance	01-JAN-2015	-	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	040301027295012015	Returned to Compliance	01-JAN-2015	31-MAR-2015	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	040301027245612015	Returned to Compliance	01-JAN-2015	31-MAR-2015	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	0403010757500102014	Returned to Compliance	01-OCT-2014	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	0403010022950102014	Returned to Compliance	01-OCT-2014	31-DEC-2014	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	040301002295042014	Returned to Compliance	01-APR-2014	30-JUN-2014	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	040301002295012014	Returned to Compliance	01-JAN-2014	31-MAR-2014	Yes
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	0403010243100122013	Returned to Compliance	01-DEC-2013	31-DEC-2013	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	0403010272950102012	Returned to Compliance	01-OCT-2012	31-DEC-2012	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	040301002295072012	Returned to Compliance	01-JUL-2012	30-SEP-2012	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	040301027295072012	Returned to Compliance	01-JUL-2012	30-SEP-2012	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	040301002295042012	Returned to Compliance	01-APR-2012	30-JUN-2012	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	040301002295012012	Returned to Compliance	01-JAN-2012	31-MAR-2012	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	040301027295012012	Returned to Compliance	01-JAN-2012	31-MAR-2012	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	0403010022950102011	Returned to Compliance	01-OCT-2011	31-DEC-2011	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	040301002295072011	Returned to Compliance	01-JUL-2011	30-SEP-2011	Yes
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	040301003400012011	Returned to Compliance	01-JAN-2011	31-DEC-2013	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	040301027245672010	Returned to Compliance	01-JUL-2010	30-SEP-2010	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	040301027295072010	Returned to Compliance	01-JUL-2010	30-SEP-2010	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	040301027245642010	Returned to Compliance	01-APR-2010	30-JUN-2010	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	040301027295042010	Returned to Compliance	01-APR-2010	30-JUN-2010	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	040301002295042010	Returned to Compliance	01-APR-2010	30-JUN-2010	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	040301027295012010	Returned to Compliance	01-JAN-2010	31-MAR-2010	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	040301027245612010	Returned to Compliance	01-JAN-2010	31-MAR-2010	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	040301002295012010	Returned to Compliance	01-JAN-2010	31-MAR-2010	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	0403010022950102009	Returned to Compliance	01-OCT-2009	31-DEC-2009	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	040301002295072009	Returned to Compliance	01-JUL-2009	30-SEP-2009	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	040301002295042009	Returned to Compliance	01-APR-2009	30-JUN-2009	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	040301027295042009	Returned to Compliance	01-APR-2009	30-JUN-2009	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	040301027295012009	Returned to Compliance	01-JAN-2009	31-MAR-2009	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	040301002295012009	Returned to Compliance	01-JAN-2009	31-MAR-2009	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	0403010022950102008	Returned to Compliance	01-OCT-2008	31-DEC-2008	Yes
MR	Monitoring, Regular	Nitrate Rule	Nitrate	040301003104012006	Returned to Compliance	01-JAN-2006	31-DEC-2006	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	040301027295012005	Returned to Compliance	01-JAN-2005	31-DEC-2005	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	040301027245612005	Returned to Compliance	01-JAN-2005	31-DEC-2005	No
MR	Monitoring, Repeat Major (TCR)	Total Coliform Rule	Coliform (TCR)	040301025310092002	Returned to Compliance	01-SEP-2002	30-SEP-2002	No

1 - 50 of 110

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
0403010OX06112543220	040301052500012024	SOX	State Compliance achieved	11-JUN-2025	State	RTC, Lead&Copper sample results were submitted for samples collected on 6/11/2025.
0403010OX06092239666	040301052500012020	SOX	State Compliance achieved	09-JUN-2022	State	RTC, sample results received.
0403010OX06092239667	040301052500012021	SOX	State Compliance achieved	09-JUN-2022	State	RTC, sample results received.
0403010FL03141734876	040301002295042015	SFL	State Administrative/Compliance Order without penalty issued	14-MAR-2017	State	AO (w/o penalty) issued by Enforcement Division on 11/1/2012.
0403010FL03141734859	040301002295072015	SFL	State Administrative/Compliance Order without penalty issued	14-MAR-2017	State	AO (w/o penalty) issued by Enforcement Division on 11/1/2012.
0403010FL03141734856	0403010022950102015	SFL	State Administrative/Compliance Order without penalty issued	14-MAR-2017	State	AO (w/o penalty) issued by Enforcement Division on 11/1/2012.
0403010OX01011734918	040301002295012014	SOX	State Compliance achieved	01-JAN-2017	State	System intertied with Gap/Cedar Ridge water system in September 2015. Cameron wells taken offline. After one year of quarterly monitoring, DBP levels below the MCL.
0403010OX01011734895	0403010022950102014	SOX	State Compliance achieved	01-JAN-2017	State	System intertied with Gap/Cedar Ridge water system in September 2015. Cameron wells taken offline. After one year of quarterly monitoring, DBP levels below the MCL.
0403010OX01011734913	040301002295042014	SOX	State Compliance achieved	01-JAN-2017	State	System intertied with Gap/Cedar Ridge water system in September 2015. Cameron wells taken offline. After one year of quarterly monitoring, DBP levels below the MCL.
0403010OX01011734888	040301002295012015	SOX	State Compliance achieved	01-JAN-2017	State	System intertied with Gap/Cedar Ridge water system in September 2015. Cameron wells taken offline. After one year of quarterly monitoring, DBP levels below the MCL.
0403010OX12061634826	040301052500072016	SOX	State Compliance achieved	06-DEC-2016	State	Sampled for Lead and Copper on 12/6/2016.
0403010OX05201634872	040301027245642015	SOX	State Compliance achieved	20-MAY-2016	State	DBPs sampled on November 2, 2015 at Alice Begay and Jack Bizardi.
0403010OX05201634866	040301027295072015	SOX	State Compliance achieved	20-MAY-2016	State	DBPs sampled on November 2, 2015 at Alice Begay and Jack Bizardi.
0403010OX05201634873	040301027295042015	SOX	State Compliance achieved	20-MAY-2016	State	DBPs sampled on November 2, 2015 at Alice Begay and Jack Bizardi.
0403010OX05201634883	040301027295012015	SOX	State Compliance achieved	20-MAY-2016	State	DBPs sampled on November 2, 2015 at Alice Begay and Jack Bizardi.
0403010OX05201634882	040301027245612015	SOX	State Compliance achieved	20-MAY-2016	State	DBPs sampled on November 2, 2015 at Alice Begay and Jack Bizardi.
0403010OX05201634865	040301027245672015	SOX	State Compliance achieved	20-MAY-2016	State	DBPs sampled on November 2, 2015 at Alice Begay and Jack Bizardi.
0403010OX04301634868	040301075750012015	SOX	State Compliance achieved	30-APR-2016	State	Cameron Community intertied with NTUA's Gap/Cedar Ridge water system. With the intertie, the Cameron wells taken offline. PN violations were for DBP exceedances. New source water DBP levels below the respective MCLs. CCRs were issud for 2015 and 2016.
0403010OX04301634879	0403010757500102014	SOX	State Compliance achieved	30-APR-2016	State	Cameron Community intertied with NTUA's Gap/Cedar Ridge water system. With the intertie, the Cameron wells taken offline. PN violations were for DBP exceedances. New source water DBP levels below the respective MCLs. CCRs were issud for 2015 and 2016.
0403010OX04301634847	040301075750072015	SOX	State Compliance achieved	30-APR-2016	State	Cameron Community intertied with NTUA's Gap/Cedar Ridge water system. With the intertie, the Cameron wells taken offline. PN violations were for DBP exceedances. New source water DBP levels below the respective MCLs. CCRs were issud for 2015 and 2016.
0403010OX04301634861	040301075750042015	SOX	State Compliance achieved	30-APR-2016	State	Cameron Community intertied with NTUA's Gap/Cedar Ridge water system. With the intertie, the Cameron wells taken offline. PN violations were for DBP exceedances. New source water DBP levels below the respective MCLs. CCRs were issud for 2015 and 2016.
0403010OX06031434967	040301003400012011	SOX	State Compliance achieved	03-JUN-2014	State	Radionuclides sampled in March 2014.
0403010OX03141434985	0403010243100122013	SOX	State Compliance achieved	14-MAR-2014	State	Subsequent monthly sampling results indicate the absence of coliforms.
0403010OX05141335013	040301002295042012	SOX	State Compliance achieved	14-MAY-2013	State	RAA (0.0658 mg/L) for last available quarterly data (from 2/25/13 sampling) indicates it is below the TTHM MCL of 0.08 mg/L. Thus, MCLs being returned to compliance. HOWEVER, the DBP values for the water system goes in and out of compliance with the MCL
0403010OX05141335011	040301002295072012	SOX	State Compliance achieved	14-MAY-2013	State	RAA (0.0658 mg/L) for last available quarterly data (from 2/25/13 sampling) indicates it is below the TTHM MCL of 0.08 mg/L. Thus, MCLs being returned to compliance. HOWEVER, the DBP values for the water system goes in and out of compliance with the MCL
0403010OX05141335016	040301002295012012	SOX	State Compliance achieved	14-MAY-2013	State	RAA (0.0658 mg/L) for last available quarterly data (from 2/25/13 sampling) indicates it is below the TTHM MCL of 0.08 mg/L. Thus, MCLs being returned to compliance. HOWEVER, the DBP values for the water system goes in and out of compliance with the MCL
0403010OX05141335021	0403010022950102011	SOX	State Compliance achieved	14-MAY-2013	State	RAA (0.0658 mg/L) for last available quarterly data (from 2/25/13 sampling) indicates it is below the TTHM MCL of 0.08 mg/L. Thus, MCLs being returned to compliance. HOWEVER, the DBP values for the water system goes in and out of compliance with the MCL
0403010OX05141335030	040301002295072011	SOX	State Compliance achieved	14-MAY-2013	State	RAA (0.0658 mg/L) for last available quarterly data (from 2/25/13 sampling) indicates it is below the TTHM MCL of 0.08 mg/L. Thus, MCLs being returned to compliance. HOWEVER, the DBP values for the water system goes in and out of compliance with the MCL
0403010OX05081335001	0403010272950102012	SOX	State Compliance achieved	08-MAY-2013	State	DBPs sampled in November 2012.
0403010OX05081335010	040301027295072012	SOX	State Compliance achieved	08-MAY-2013	State	DBPs sampled in August 2012.
0403010OX08161235015	040301027295012012	SOX	State Compliance achieved	16-AUG-2012	State	Results received on August 3, 2012.
0403010OX11051035186	040301027245672010	SOX	State Compliance achieved	05-NOV-2010	State	Samples collected in May 2010.
0403010OX11051035187	040301027295072010	SOX	State Compliance achieved	05-NOV-2010	State	Samples collected in May 2010.
0403010OX09171035188	040301027245642010	SOX	State Compliance achieved	17-SEP-2010	State	Samples collected May 2010.
0403010OX09171035189	040301027295042010	SOX	State Compliance achieved	17-SEP-2010	State	Samples collected May 2010.
0403010OX09151035190	040301002295042010	SOX	State Compliance achieved	15-SEP-2010	State	TTHM result for the May 2010 sample was 0.0529 mg/L. RAA is 0.0725, which is below the TTHM MCL of 0.08 mg/L. System will continue with quarterly monitoring to confirm that the RAA stays below the TTHM MCL.
0403010OX06071035212	040301002295072009	SOX	State Compliance achieved	07-JUN-2010	State	RAA for the samples colleted in March and April 2010 were below the MCL.
0403010OX06071035303	040301002295042009	SOX	State Compliance achieved	07-JUN-2010	State	RAA for the samples collected in March and May 2010 were below the MCL.
0403010OX06071035195	040301027295012010	SOX	State Compliance achieved	07-JUN-2010	State	-
0403010OX06071035194	040301027245612010	SOX	State Compliance achieved	07-JUN-2010	State	-
0403010OX06071035196	040301002295012010	SOX	State Compliance achieved	07-JUN-2010	State	-
0403010OX06071035204	0403010022950102009	SOX	State Compliance achieved	07-JUN-2010	State	RAA for samples collected in March and May 2010 were below the MCL.
0403010OX01261035213	040301027295042009	SOX	State Compliance achieved	26-JAN-2010	State	-
0403010OX01261035301	040301027295012009	SOX	State Compliance achieved	26-JAN-2010	State	-
0403010OX01261035308	040301002295012009	SOX	State Compliance achieved	26-JAN-2010	State	-
0403010OX01261035560	0403010022950102008	SOX	State Compliance achieved	26-JAN-2010	State	-
0403010OX4/13/2007	040301002102012000	SOX	State Compliance achieved	13-APR-2007	State	historic rtcs
0403010OX4/13/2007	0403010223100102001	SOX	State Compliance achieved	13-APR-2007	State	historic rtcs
0403010OX4/13/2007	040301003200512001	SOX	State Compliance achieved	13-APR-2007	State	historic rtcs
0403010OX4/13/2007	040301003201012001	SOX	State Compliance achieved	13-APR-2007	State	historic rtcs

1 - 50 of 110

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
03T-552 (Cameron 2)	0403010GW002	Yes	Well	Ground water	Emergency	Active
NN0403009 NTUA Gap/Cedar Ridge CWS	0403010GW006	Yes	Well	Ground water	Permanent	Active
03T-551 (Cameron 1)	0403010GW001	Yes	Well	Ground water	Other	Inactive
Tribal Well 3 - 3T-537A	0403010GW005	Yes	Well	Ground water	Emergency	Inactive
Tribal Well 2-3T-538C	0403010GW004	Yes	Well	Ground water	Emergency	Inactive
Tribal Well 1 - 3T-538B	0403010GW003	Yes	Well	Ground water	Emergency	Inactive
03T-552 Entry Point (Cameron 2)	0403010EP002	No	Common Headers	-	-	Active
03T-551 Entry Point (Cameron 1)	0403010EP001	No	Common Headers	-	-	Inactive
NN0403010 Cameron Distribution System	0403010DS001	No	Distribution System/Zone	-	-	Active
Intertie Point with NTUA-Gap/Cedar Ridge	0403010OT001	No	Other	-	-	Inactive
East Older 110,000-Gallon Tank	0403010ST001	No	Storage	-	-	Active
West 110,000-Gallon Newer Tank	0403010ST002	No	Storage	-	-	Active
03T-552 Treatment (Cameron 2 ; GW002)	0403010TP002	No	Treatment Plant	-	-	Active
Wells #1 & #2 Treatment Plant	0403010TP001	No	Treatment Plant	-	-	Inactive

1 - 14 of 14

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
03T-552 Treatment (Cameron 2 ; GW002)	0403010TP002	Hypochlorination, Post	Disinfection
03T-552 Treatment (Cameron 2 ; GW002)	0403010TP002	Fluoridation	Other

1 - 2 of 2

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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