Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	NN3503028
PWS Name	Toadlena NTUA
PWS Type	Community water system
Owner Type	Tribal Government
Primary Source	Ground water
Primacy Type	Tribal
Is Wholesaler?	No
Population Served	903
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
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100572025	Known	01-JUL-2025	30-SEP-2025	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	350302875750042025	Open	01-APR-2025	-	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100542025	Known	01-APR-2025	30-JUN-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100512025	Known	01-JAN-2025	31-MAR-2025	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	3503028021005102024	Known	01-OCT-2024	31-DEC-2024	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	3503028757500102024	Open	01-OCT-2024	-	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	350302875750072024	Returned to Compliance	01-JUL-2024	-	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100572024	Known	01-JUL-2024	30-SEP-2024	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	350302875750042024	Returned to Compliance	01-APR-2024	-	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100542024	Known	01-APR-2024	30-JUN-2024	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100512024	Known	01-JAN-2024	31-MAR-2024	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	3503028021005102023	Known	01-OCT-2023	31-DEC-2023	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100572023	Known	01-JUL-2023	30-SEP-2023	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100542023	Known	01-APR-2023	30-JUN-2023	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100512023	Known	01-JAN-2023	31-MAR-2023	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	3503028021005102022	Known	01-OCT-2022	31-DEC-2022	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100572022	Known	01-JUL-2022	30-SEP-2022	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100542022	Known	01-APR-2022	30-JUN-2022	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	350302875750042022	Returned to Compliance	01-APR-2022	-	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100512022	Known	01-JAN-2022	31-MAR-2022	Yes
MR	Monitoring, Regular	Arsenic Rule	Arsenic	350302803100512022	Returned to Compliance	01-JAN-2022	31-MAR-2022	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	3503028021005102021	Known	01-OCT-2021	31-DEC-2021	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100572021	Known	01-JUL-2021	30-SEP-2021	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100542021	Known	01-APR-2021	30-JUN-2021	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	350302875750042021	Returned to Compliance	01-APR-2021	-	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100512021	Known	01-JAN-2021	31-MAR-2021	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	3503028021005102020	Known	01-OCT-2020	31-DEC-2020	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100572020	Known	01-JUL-2020	30-SEP-2020	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100542020	Known	01-APR-2020	30-JUN-2020	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	350302875750042020	Returned to Compliance	01-APR-2020	-	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100512020	Known	01-JAN-2020	31-MAR-2020	Yes
MR	Monitoring, Routine (IDSE)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	350302830295012020	Returned to Compliance	01-JAN-2020	31-DEC-2020	No
MR	Monitoring, Routine (IDSE)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	350302830245612020	Returned to Compliance	01-JAN-2020	31-DEC-2020	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	3503028021005102019	Known	01-OCT-2019	31-DEC-2019	Yes
MR	Monitoring, Regular	Arsenic Rule	Arsenic	350302803100572019	Returned to Compliance	01-JUL-2019	30-SEP-2019	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100572019	Known	01-JUL-2019	30-SEP-2019	Yes
MR	Monitoring, Regular	Arsenic Rule	Arsenic	350302803100542019	Returned to Compliance	01-APR-2019	30-JUN-2019	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100542019	Known	01-APR-2019	30-JUN-2019	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100512019	Known	01-JAN-2019	31-MAR-2019	Yes
MR	Monitoring, Regular	Arsenic Rule	Arsenic	350302803100512019	Returned to Compliance	01-JAN-2019	31-MAR-2019	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	3503028021005102018	Known	01-OCT-2018	31-DEC-2018	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	3503028757500102018	Returned to Compliance	01-OCT-2018	-	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100572018	Known	01-JUL-2018	30-SEP-2018	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100542018	Known	01-APR-2018	30-JUN-2018	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100512018	Known	01-JAN-2018	31-MAR-2018	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	3503028021005102017	Known	01-OCT-2017	31-DEC-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100572017	Known	01-JUL-2017	30-SEP-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100542017	Known	01-APR-2017	30-JUN-2017	Yes
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	350302875750012017	Returned to Compliance	01-JAN-2017	-	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	350302802100512017	Known	01-JAN-2017	31-MAR-2017	Yes

1 - 50 of 142

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
3503028FJ12052543074	350302802100542025	SFJ	State Formal Notice of Violation issued	05-DEC-2025	State	NOV issued for exceeding the arsenic MCL.
3503028OX08062441976	350302875750072024	SOX	State Compliance achieved	06-AUG-2024	State	RTC, PN received on 4/11/2024.
3503028OX04112441975	350302875750042024	SOX	State Compliance achieved	11-APR-2024	State	RTC, PN received on 4/11/2024.
3503028OX02232339915	3503028350600102013	SOX	State Compliance achieved	23-FEB-2023	State	DBP site sample plan received and approved.
3503028OX05182239516	350302803100512022	SOX	State Compliance achieved	18-MAY-2022	State	2022-1Q. RTC. Full sample set collected 05/18/2022.
3503028OX04072240009	350302875750042022	SOX	State Compliance achieved	07-APR-2022	State	RTC, PN received for Jan/Feb/Mar 2022.
3503028OX07142139134	350302875750042021	SOX	State Compliance achieved	14-JUL-2021	State	2021 2nd Quarter PN. Return To Compliance. Public Notice received 07/14/2021.
3503028OX07132138899	350302830245612020	SOX	State Compliance achieved	13-JUL-2021	State	2020 DBPs Stage 2 M/R. Return To Compliance. Full sample set collected 07/13/2021.
3503028OX07132138898	350302830295012020	SOX	State Compliance achieved	13-JUL-2021	State	2020 DBPs Stage 2 M/R. Return To Compliance. Full sample set collected 07/13/2021.
3503028FJ03312138529	350302875750042020	SFJ	State Formal Notice of Violation issued	31-MAR-2021	State	NOV issued for failure to prepare and distribute a PN for the arsenic exceedance of April 2020.
3503028OX02042038665	350302803100572019	SOX	State Compliance achieved	04-FEB-2020	State	RTC, sampled on 2/4/20.
3503028OX08061937105	350302803100542019	SOX	State Compliance achieved	06-AUG-2019	State	RTC, sample results received for sample collected on 8/6/19.
3503028OX02121937027	350302803100512019	SOX	State Compliance achieved	12-FEB-2019	State	RTC, quarterly sampling conducted and results received.
3503028OX12171836943	3503028757500102018	SOX	State Compliance achieved	17-DEC-2018	State	RTC, PN received.
3503028IF12191734133	350302802100572017	SIF	State Public Notification received	19-DEC-2017	State	PN received for arsenic exceedance.
3503028OX05191733445	350302875750012017	SOX	State Compliance achieved	19-MAY-2017	State	RTC, PN received.
3503028FJ02271732946	3503028021005102016	SFJ	State Formal Notice of Violation issued	27-FEB-2017	State	NOV issued for exceeding the MCL for arsenic.
3503028OX10081632743	350302875750042016	SOX	State Compliance achieved	08-OCT-2016	State	RTC, PN received.
3503028OX08021632697	350302802100512016	SOX	State Compliance achieved	02-AUG-2016	State	RTC, RAA is 0.0099 for EP002.
3503028OX08021632698	350302802100542016	SOX	State Compliance achieved	02-AUG-2016	State	RTC, RAA is 0.0099 for EP002.
3503028OX03201632638	350302875750072015	SOX	State Compliance achieved	20-MAR-2016	State	RTC, PN received.
3503028IE11171430387	3503028021005102014	SIE	State Public Notification requested	17-NOV-2014	State	NOV, PN required.
3503028OX10011429783	350302802100572013	SOX	State Compliance achieved	01-OCT-2014	State	RTC, PN via 2013 CCR.
3503028OX10011429785	3503028021005102013	SOX	State Compliance achieved	01-OCT-2014	State	RTC, PN via 2013 CCR.
3503028OX10011429784	350302803102512011	SOX	State Compliance achieved	01-OCT-2014	State	RTC, PN via 2013 CCR.
3503028OX10011429786	350302875750012014	SOX	State Compliance achieved	01-OCT-2014	State	RTC, PN via 2013 CCR.
3503028OX08041429874	350302803100572014	SOX	State Compliance achieved	04-AUG-2014	State	RTC, sample results received for sample collected on 08/4/2014.
3503028OX11041331738	350302803100542015	SOX	State Compliance achieved	04-NOV-2013	State	RTC, sample results received.
3503028FK10281325003	350302802100512013	SFK	State Bilateral Compliance Agreement signed	28-OCT-2013	State	Compliance Plan Submitted by NTUA re: Admin Order for Arsenic Compliance.
3503028FL09231330954	350302802100512015	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2015-CQ1. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231331814	3503028021005102015	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2015-CQ4. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231332736	350302802100572016	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2016-CQ3. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231333220	350302802100512017	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2017-CQ1. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231333305	350302802100542017	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2017-CQ2. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231334357	3503028021005102017	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2017-CQ4. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231334508	350302802100512018	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2018-CQ1. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231336318	350302802100542018	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2018-CQ2. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231336489	350302802100572018	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2018-CQ3. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231336597	3503028021005102018	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2018-CQ4. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231336924	350302802100512019	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2019-CQ1. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231337042	350302802100542019	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2019-CQ2. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231337119	350302802100572019	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2019-CQ3. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231337431	3503028021005102019	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2019-CQ4. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231337634	350302802100512020	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2020-CQ1. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231337750	350302802100542020	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2020-CQ2. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231337981	350302802100572020	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2020-CQ3. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231338103	3503028021005102020	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2020-CQ4. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231338672	350302802100512021	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2021-CQ1. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231338799	350302802100542021	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2021-CQ2. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.
3503028FL09231338985	350302802100572021	SFL	State Administrative/Compliance Order without penalty issued	23-SEP-2013	State	CY2021-CQ3. Administrative Order issued to NTUA regarding Arsenic. AO signed 9/12/13.

1 - 50 of 139

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
12T-611 (TOADLENA SOUTH ; TOADLENA 1)	3503028GW001	Yes	Well	Ground water	Permanent	Active
12-0766 (TOADLENA NORTH ; TOADLENA 2)	3503028GW002	Yes	Well	Ground water	Permanent	Active
12T-611 Entry Point (Toadlena South)	3503028EP001	No	Common Headers	-	-	Active
12-0766 Entry Point (Toadlena North)	3503028EP002	No	Common Headers	-	-	Active
NN3503028 NTUA Toadlena Distribution System	3503028DS001	No	Distribution System/Zone	-	-	Active
Toadlena South (Beige) #1	3503028ST001	No	Storage	-	-	Active
Toadlena South (Green) #2	3503028ST002	No	Storage	-	-	Active
Toadlena North	3503028ST003	No	Storage	-	-	Active
12T-611 Treatment (Toadlena South)	3503028TP001	No	Treatment Plant	-	-	Active
12-0766 Treatment (Toadlena North)	3503028TP002	No	Treatment Plant	-	-	Active

1 - 10 of 10

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
12T-611 Treatment (Toadlena South)	3503028TP001	Hypochlorination, Post	Disinfection
12-0766 Treatment (Toadlena North)	3503028TP002	Hypochlorination, Post	Disinfection

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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