Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	NN3500261
PWS Name	Twin Lakes NTUA
PWS Type	Community water system
Owner Type	Tribal Government
Primary Source	Ground water
Primacy Type	Tribal
Is Wholesaler?	No
Population Served	1833
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	Monitoring, Routine (IDSE)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	350026130295012020	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)	350026130245612020	Returned to Compliance	01-JAN-2020	31-DEC-2020	No
TT	Treatment Technique, Corrective/Expedited Actions (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	35002612C800042016	Returned to Compliance	01-APR-2016	-	Yes
Other	Sample Siting Plan Errors (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	35002615A800042016	Returned to Compliance	01-APR-2016	-	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	350026122310092015	Returned to Compliance	01-SEP-2015	30-SEP-2015	Yes
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	350026124310042014	Returned to Compliance	01-APR-2014	30-APR-2014	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	350026103104012014	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Monitoring, Regular	Nitrate Rule	Nitrite	350026103104112014	Returned to Compliance	01-JAN-2014	31-DEC-2014	No
MR	Failure Submit IDSE/Subpart V Plan Rpt	Stage 2 Disinfectants and Disinfection Byproducts Rule	Stage 2 Disinfectants and Disinfection Byproducts Rule	3500261350600102013	Returned to Compliance	01-OCT-2013	-	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	3500261233100122012	Returned to Compliance	01-DEC-2012	31-DEC-2012	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	3500261233100112012	Returned to Compliance	01-NOV-2012	30-NOV-2012	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	2,3,7,8-TCDD	350026103206312011	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)	350026127245612011	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	350026127295012011	Returned to Compliance	01-JAN-2011	31-DEC-2011	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	350026127245612010	Returned to Compliance	01-JAN-2010	31-DEC-2010	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	350026127295012010	Returned to Compliance	01-JAN-2010	31-DEC-2010	No
MR	Monitoring, Regular	Nitrate Rule	Nitrite	350026103104112010	Returned to Compliance	01-JAN-2010	31-DEC-2010	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	350026124310082009	Returned to Compliance	01-AUG-2009	31-AUG-2009	No
MR	Monitoring, Regular	Inorganic Chemicals	Barium	350026103101012008	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Inorganic Chemicals	Fluoride	350026103102512008	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Inorganic Chemicals	CYANIDE	350026103102412008	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Inorganic Chemicals	Mercury	350026103103512008	Returned to Compliance	01-JAN-2008	31-DEC-2010	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Uranium	350026103400612005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	350026103401012005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2,4-Trichlorobenzene	350026103237812005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	350026103238012005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Xylenes, Total	350026103295512005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	DICHLOROMETHANE	350026103296412005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	350026103296812005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	p-Dichlorobenzene	350026103296912005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Vinyl chloride	350026103297612005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1-Dichloroethylene	350026103297712005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	trans-1,2-Dichloroethylene	350026103297912005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	350026103298012005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	350026103298112005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	350026103298212005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	350026103298312005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	350026103298412005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,2-Trichloroethane	350026103298512005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	350026103298712005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	350026103298912005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	350026103299012005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	350026103299112005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	350026103299612005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	350026103400012005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	350026103299212005	Returned to Compliance	01-JAN-2005	31-DEC-2010	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	350026103400012004	Returned to Compliance	01-JAN-2004	31-DEC-2004	No

1 - 47 of 47

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
3500261OX09302542934	35002615A800042016	SOX	State Compliance achieved	30-SEP-2025	State	RTCR Sample Site Plan received and approved.
3500261OX02182541667	3500261350600102013	SOX	State Compliance achieved	18-FEB-2025	State	DBP site sample plan submitted and approved.
3500261OX07062138881	350026130245612020	SOX	State Compliance achieved	06-JUL-2021	State	2020 DBPs Stage 2 M/R. Return To Compliance. Full sample sets collected 07/06/2021.
3500261OX07062138880	350026130295012020	SOX	State Compliance achieved	06-JUL-2021	State	2020 DBPs Stage 2 M/R. Return To Compliance. Full sample sets collected 07/06/2021.
3500261FJ08311632617	35002612C800042016	SFJ	State Formal Notice of Violation issued	31-AUG-2016	State	NOV issued for failure to "take corrective actions" relating to a positive bactee sample.
3500261FJ12021531434	350026122310092015	SFJ	State Formal Notice of Violation issued	02-DEC-2015	State	NOV issued for a bactee MCL exceedance.
3500261OX04141531742	350026103104112014	SOX	State Compliance achieved	14-APR-2015	State	RTC, results received.
3500261OX04141531741	350026103104012014	SOX	State Compliance achieved	14-APR-2015	State	RTC, results received.
3500261IE08281428633	350026124310042014	SIE	State Public Notification requested	28-AUG-2014	State	NOV, PN required.
3500261FJ05061428147	350026103206312011	SFJ	State Formal Notice of Violation issued	06-MAY-2014	State	NOV issued for failure to collect a dioxin sample for well #14-0600.
3500261OX07161324942	350026127245612011	SOX	State Compliance achieved	16-JUL-2013	State	RTC, sample results received for samples collected on 07/16/2013.
3500261OX07161324940	350026127245612010	SOX	State Compliance achieved	16-JUL-2013	State	RTC, sample results received for samples collected on 07/16/2013.
3500261OX07161324939	350026127295012010	SOX	State Compliance achieved	16-JUL-2013	State	RTC, sample results received for samples collected on 07/16/2013.
3500261OX07161324941	350026127295012011	SOX	State Compliance achieved	16-JUL-2013	State	RTC, sample results received for samples collected on 07/16/2013.
3500261OX01111323605	3500261233100122012	SOX	State Compliance achieved	11-JAN-2013	State	2012 Dec TCR M/R. RTC, received NTUA TCR results on 01-11-2013.
3500261OX12111223687	3500261233100112012	SOX	State Compliance achieved	11-DEC-2012	State	2012 Nov TCR M/R. RTC, received NTUA TCR results on 12-11-2012.
3500261OX06131224479	350026103101012008	SOX	State Compliance achieved	13-JUN-2012	State	RTC, sample results received for well #2.
3500261OX02211219122	350026103299112005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219117	350026103299212005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219120	350026103299612005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219107	350026103299012005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219118	350026103298912005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219121	350026103298712005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219127	350026103298512005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219110	350026103298412005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219116	350026103298312005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219108	350026103298212005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219109	350026103298012005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219123	350026103297912005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219112	350026103297712005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219114	350026103297612005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219111	350026103296912005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219119	350026103296812005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219125	350026103296412005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219124	350026103295512005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219115	350026103238012005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219126	350026103237812005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX02211219113	350026103298112005	SOX	State Compliance achieved	21-FEB-2012	State	RTC, VOC waiver granted. The next set of samples are due during 2011-2013.
3500261OX11031115940	350026103400612005	SOX	State Compliance achieved	03-NOV-2011	State	RTC, system was placed on a six-year sampling cycle for radionuclides. Next sample is due prior to 12/31/11.
3500261OX11031115941	350026103400012005	SOX	State Compliance achieved	03-NOV-2011	State	RTC, system was placed on a six-year sampling cycle for radionuclides. Next sample is due prior to 12/31/11.
3500261FJ11031115945	350026103102412008	SFJ	State Formal Notice of Violation issued	03-NOV-2011	State	NOV issued for failure to collect samples for barium, cyanide (free), fluoride, and mercury.
3500261OX11031115939	350026103401012005	SOX	State Compliance achieved	03-NOV-2011	State	RTC, system was placed on a six-year sampling cycle for radionuclides. Next sample is due prior to 12/31/11.
3500261FJ11031115944	350026103103512008	SFJ	State Formal Notice of Violation issued	03-NOV-2011	State	NOV issued for failure to collect samples for barium, cyanide (free), fluoride, and mercury.
3500261FJ11031115943	350026103102512008	SFJ	State Formal Notice of Violation issued	03-NOV-2011	State	NOV issued for failure to collect samples for barium, cyanide (free), fluoride, and mercury.
3500261OX10211112832	350026103104112010	SOX	State Compliance achieved	21-OCT-2011	State	RTC, NTUA had issues with their analyzer. They have changed out the columns and had the equipment calibrated. PWSSP invalidated results. Pursuant to Section 408 (A)(1), the sampling frequency is specified by the Director.
3500261IE0511108326	350026124310082009	SIE	State Public Notification requested	11-MAY-2010	State	PN requested.
3500261OX4/7/2005	350026103400012004	SOX	State Compliance achieved	07-APR-2005	State	RTC, waiver granted for radionuclide sampling.

1 - 47 of 47

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
14-0600 (TWIN LAKES 2)	3500261GW002	Yes	Well	Ground water	Other	Inactive
14T-531 (TWIN LAKES 1)	3500261GW001	Yes	Well	Ground water	Permanent	Active
14T-531 Entry Point (Twin Lakes 1)	3500261EP001	No	Common Headers	-	-	Active
14-0600 Entry Point (Twin Lakes 2)	3500261EP002	No	Common Headers	-	-	Inactive
NN3500261 NTUA Twin Lakes Distribution	3500261DS001	No	Distribution System/Zone	-	-	Active
Twin Lakes A East	3500261ST001	No	Storage	-	-	Active
Twin Lakes B West	3500261ST002	No	Storage	-	-	Active
14T-531 Treatment (Twin Lakes 1)	3500261TP001	No	Treatment Plant	-	-	Active
14-0600 Treatment (Twin Lakes 2)	3500261TP002	No	Treatment Plant	-	-	Inactive

1 - 9 of 9

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
14T-531 Treatment (Twin Lakes 1)	3500261TP001	Gaseous Chlorination, Post	Disinfection
14T-531 Treatment (Twin Lakes 1)	3500261TP001	Fluoridation	Other
14-0600 Treatment (Twin Lakes 2)	3500261TP002	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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