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PWS ID	NN0403023
PWS Name	Round Rock NTUA
PWS Type	Community water system
Owner Type	Tribal Government
Primary Source	Ground water
Primacy Type	Tribal
Is Wholesaler?	No
Population Served	876
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	Total Haloacetic Acids (HAA5)	040302330245612020	Returned to Compliance	01-JAN-2020	31-DEC-2020	No
MR	Monitoring, Routine (IDSE)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	040302330295012020	Returned to Compliance	01-JAN-2020	31-DEC-2020	No
Other	Sample Siting Plan Errors (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	04030235A800042016	Returned to Compliance	01-APR-2016	-	No
MR	Failure Submit IDSE/Subpart V Plan Rpt	Stage 2 Disinfectants and Disinfection Byproducts Rule	Stage 2 Disinfectants and Disinfection Byproducts Rule	0403023350600102013	Returned to Compliance	01-OCT-2013	-	No
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	040302302401072013	Returned to Compliance	01-JUL-2013	30-SEP-2013	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	040302302401042013	Returned to Compliance	01-APR-2013	30-JUN-2013	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	040302302401012013	Returned to Compliance	01-JAN-2013	31-MAR-2013	Yes
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	0403023233100122012	Returned to Compliance	01-DEC-2012	31-DEC-2012	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	0403023233100112012	Returned to Compliance	01-NOV-2012	30-NOV-2012	No
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	0403023024010102012	Returned to Compliance	01-OCT-2012	31-DEC-2012	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	040302302401072012	Returned to Compliance	01-JUL-2012	30-SEP-2012	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	040302302401042012	Returned to Compliance	01-APR-2012	30-JUN-2012	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	040302302401012012	Returned to Compliance	01-JAN-2012	31-MAR-2012	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	0403023024010102010	Returned to Compliance	01-OCT-2010	31-DEC-2010	Yes
MR	Monitoring, Regular	Nitrate Rule	Nitrate	040302303104012010	Returned to Compliance	01-JAN-2010	31-DEC-2010	No
MR	Monitoring, Regular	Nitrate Rule	Nitrite	040302303104112010	Returned to Compliance	01-JAN-2010	31-DEC-2010	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	040302322310082007	Returned to Compliance	01-AUG-2007	31-AUG-2007	Yes
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	040302303400012004	Returned to Compliance	01-JAN-2004	31-DEC-2004	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	0200054	Known	01-JUN-2002	30-JUN-2002	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	040302324310062002	Returned to Compliance	01-JUN-2002	30-JUN-2002	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	0200053	Known	01-MAY-2002	31-MAY-2002	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	040302324310052002	Returned to Compliance	01-MAY-2002	31-MAY-2002	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	0200052	Known	01-APR-2002	30-APR-2002	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	040302324310042002	Returned to Compliance	01-APR-2002	30-APR-2002	No

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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
0403023OX02102541659	04030235A800042016	SOX	State Compliance achieved	10-FEB-2025	State	RTCR Site Sample Plan submitted and approved.
0403023OX03222239168	0403023350600102013	SOX	State Compliance achieved	22-MAR-2022	State	Sample Site Plan approved 03/22/2022 for DBPs Stage 2.
0403023OX07122138943	040302330245612020	SOX	State Compliance achieved	12-JUL-2021	State	2020 DBPs Stage 2 M/R. Return To Compliance. Full sample sets collected 07/12/2021.
0403023OX07122138942	040302330295012020	SOX	State Compliance achieved	12-JUL-2021	State	2020 DBPs Stage 2 M/R. Return To Compliance. Full sample sets collected 07/12/2021.
0403023OX11171429408	040302302401042012	SOX	State Compliance achieved	17-NOV-2014	State	RTC, AO issued 09/23/2013. Offending well was disconnected and now offline (Well#1).
0403023OX11171429409	040302302401072012	SOX	State Compliance achieved	17-NOV-2014	State	RTC, AO issued 09/23/2013. Offending well was disconnected and now offline (Well#1).
0403023OX11171429410	0403023024010102012	SOX	State Compliance achieved	17-NOV-2014	State	RTC, AO issued 09/23/2013. Offending well was disconnected and now offline (Well#1).
0403023OX11171429412	040302302401072013	SOX	State Compliance achieved	17-NOV-2014	State	RTC, system shut down the well as of December 6, 2013. Well #1 had the high rads and is now offline/disconnected from the system. System will continue to collect quarterly samples until December 2015 when the AO will be lifted.
0403023OX11171429411	040302302401042013	SOX	State Compliance achieved	17-NOV-2014	State	RTC, system shut down the well as of December 6, 2013. Well #1 had the high rads and is now offline/disconnected from the system. System will continue to collect quarterly samples until December 2015 when the AO will be lifted.
0403023OX02281324474	040302302401012013	SOX	State Compliance achieved	28-FEB-2013	State	RTC, sample results below the MCL but the RAA is still above the MCL. Sample was collected for the 1st quarter 2013. System will remain on a quarterly sampling schedule.
0403023OX01111323586	0403023233100122012	SOX	State Compliance achieved	11-JAN-2013	State	2012 Dec TCR M/R. RTC, received NTUA TCR results on 01-11-2013.
0403023OX12111223668	0403023233100112012	SOX	State Compliance achieved	11-DEC-2012	State	2012 Nov TCR M/R. RTC, received NTUA TCR results on 12-11-2012.
0403023OX02231220359	0403023024010102010	SOX	State Compliance achieved	23-FEB-2012	State	RTC, Well 11T-501 and 11-610 are used in this system. Well 11T-523 is on standby due to fluctuating total radium levels and due to poor aesthetic qualities. This well does not contribute to the system.
0403023OX02221220956	040302302401012012	SOX	State Compliance achieved	22-FEB-2012	State	RTC, NTUA explained that Well#2 is on standby and not used. Well #1 and a new well (11-610) are used to supply the system.
0403023OX02211218788	040302303104012010	SOX	State Compliance achieved	21-FEB-2012	State	RTC, Well #2 is inactive..
0403023OX10211112817	040302303104112010	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.
0403023OX0516089154	040302322310082007	SOX	State Compliance achieved	16-MAY-2008	State	RTC, sampled for repeats and additional samples the month following a report of positive bactee, provided a public notice.
0403023OX03/16/2007	040302324310052002	SOX	State Compliance achieved	16-MAR-2007	State	Results submitted.
0403023OX03/16/2007	040302324310042002	SOX	State Compliance achieved	16-MAR-2007	State	Results submitted.
0403023OX03/16/2007	040302324310062002	SOX	State Compliance achieved	16-MAR-2007	State	Results submitted.
0403023OX08/31/2005	040302303400012004	SOX	State Compliance achieved	31-AUG-2005	State	Samples collected on February 22, May 24 and August 31, 2005. PWSSP did grant a waiver and required NTUA to collect four quarterly samples.

1 - 21 of 21

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
11T-501 (Round Rock 1)	0403023GW001	Yes	Well	Ground water	Other	Inactive
11-610 (Round Rock 3)	0403023GW003	Yes	Well	Ground water	Permanent	Active
11T-523 (Round Rock 2)	0403023GW002	Yes	Well	Ground water	Other	Inactive
11-610 Entry Point (Round Rock 3)	0403023EP003	No	Common Headers	-	-	Active
11T-501 Entry Point (Round Rock 1)	0403023EP001	No	Common Headers	-	-	Inactive
11T-523 Entry Point (Round Rock 2)	0403023EP002	No	Common Headers	-	-	Inactive
NN0403023 Round Rock Distribution	0403023DS001	No	Distribution System/Zone	-	-	Active
Round Rock Booster Station 1	0403023PF001	No	Pump Facility	-	-	Active
Round Rock Booster Station 2	0403023PF002	No	Pump Facility	-	-	Active
Round Rock 1 (Main)	0403023ST001	No	Storage	-	-	Active
Round Rock 2 (East)	0403023ST002	No	Storage	-	-	Active
Round Rock 3	0403023ST003	No	Storage	-	-	Active
11-610 Treatment (Round Rock 3)	0403023TP003	No	Treatment Plant	-	-	Active
11T-501 Treatment (Round Rock 1)	0403023TP001	No	Treatment Plant	-	-	Inactive
11T-523 Treatment (Round Rock 2)	0403023TP002	No	Treatment Plant	-	-	Inactive

1 - 15 of 15

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
11T-501 Treatment (Round Rock 1)	0403023TP001	Hypochlorination, Post	Disinfection
11T-501 Treatment (Round Rock 1)	0403023TP001	Fluoridation	Other
11T-523 Treatment (Round Rock 2)	0403023TP002	Sequestration	Iron removal
11T-523 Treatment (Round Rock 2)	0403023TP002	Hypochlorination, Post	Disinfection
11T-523 Treatment (Round Rock 2)	0403023TP002	Fluoridation	Other
11-610 Treatment (Round Rock 3)	0403023TP003	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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