HOLLISTER, OK · Tillman County

HOLLISTER Water System

Current status

1 item on record is open and awaiting resolution as of July 4, 2026. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings. Full details are in the violation history below.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace Oklahoma’s official records. Always confirm current status with Oklahoma before making decisions based on this information.

System facts

System ID (PWSID): OK2007102
System type: Community Water System
Population served: 60
Service connections: 20
Ownership: local government
Water source: groundwater (wells)

Violation history

LSL Inventory
Health-based
LEAD AND COPPER RULE REVISIONS
October 17, 2024 – July 15, 2025
Resolved
LSL Reporting
—
LEAD AND COPPER RULE REVISIONS
October 17, 2024 – July 15, 2025
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
October 1, 2022 – September 30, 2023
Resolved
Monitoring and Reporting (DBP)
—
TTHM
October 1, 2022 – September 30, 2023
Resolved
Monitoring and Reporting (DBP)
—
TTHM
October 1, 2021 – September 30, 2022
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
October 1, 2021 – September 30, 2022
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
August 19, 2019 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
July 1, 2019 – September 30, 2019
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
July 1, 2019 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
TTHM
July 1, 2019 – September 30, 2019
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
June 15, 2019 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
April 1, 2019 – June 30, 2019
Resolved
Monitoring and Reporting (DBP)
—
TTHM
April 1, 2019 – June 30, 2019
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
February 14, 2019 – February 11, 2020
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
February 14, 2019 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
January 1, 2019 – March 31, 2019
Resolved
Monitoring and Reporting (DBP)
—
TTHM
January 1, 2019 – March 31, 2019
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 2019 – February 11, 2020
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
November 14, 2018 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
October 1, 2018 – December 31, 2018
Resolved
Monitoring and Reporting (DBP)
—
TTHM
October 1, 2018 – December 31, 2018
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
August 19, 2018 – February 11, 2020
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
July 18, 2018 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
TTHM
July 1, 2018 – September 30, 2018
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
July 1, 2018 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
July 1, 2018 – September 30, 2018
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
April 21, 2018 – February 11, 2020
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
April 21, 2018 – February 11, 2020
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
April 21, 2018 – February 11, 2020
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
April 21, 2018 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
TTHM
April 1, 2018 – June 30, 2018
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
April 1, 2018 – June 30, 2018
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 2018 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
TTHM
October 1, 2017 – December 31, 2017
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
October 1, 2017 – December 31, 2017
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
July 1, 2017 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
April 1, 2017 – June 30, 2017
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
March 12, 2017 – February 11, 2020
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
March 12, 2017 – February 11, 2020
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
March 12, 2017 – February 11, 2020
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
March 12, 2017 – February 11, 2020
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
January 2, 2017 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
TTHM
January 1, 2017 – March 31, 2017
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
December 23, 2016 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
October 1, 2016 – December 31, 2016
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
July 30, 2016 – February 11, 2020
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2016 – January 9, 2020
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
July 1, 2016 – February 11, 2020
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
May 4, 2016 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
TTHM
April 1, 2016 – June 30, 2016
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 2016 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
January 1, 2016 – March 31, 2016
Resolved
Monitoring and Reporting (DBP)
—
TTHM
January 1, 2016 – March 31, 2016
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
October 1, 2015 – December 31, 2015
Resolved
Monitoring and Reporting (DBP)
—
TTHM
October 1, 2015 – December 31, 2015
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
September 14, 2015 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
TTHM
July 1, 2015 – September 30, 2015
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
July 1, 2015 – September 30, 2015
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2015 – January 9, 2020
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
July 1, 2015 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
April 1, 2015 – June 30, 2015
Resolved
Monitoring and Reporting (DBP)
—
TTHM
April 1, 2015 – June 30, 2015
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
January 1, 2015 – March 31, 2015
Resolved
Monitoring and Reporting (DBP)
—
TTHM
January 1, 2015 – March 31, 2015
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 2015 – February 11, 2020
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
July 1, 2014 – February 11, 2020
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2014 – January 9, 2020
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 2014 – February 11, 2020
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
November 1, 2013 – November 30, 2013
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2013 – January 9, 2020
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
July 1, 2013 – July 31, 2013
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
July 1, 2013 – February 11, 2020
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
June 1, 2013 – June 30, 2013
Resolved
Monitoring, Source Water (GWR)
—
E. COLI
June 1, 2013 – June 30, 2013
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 2013 – February 8, 2017
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2012 – February 11, 2020
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 2012 – September 27, 2016
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2011 – February 11, 2020
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 2011
Addressed
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 2011 – September 27, 2016
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
July 1, 2010 – September 27, 2016
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2010 – February 11, 2020
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
June 1, 2010 – June 30, 2010
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
October 1, 2009 – September 27, 2016
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
December 1, 2007 – December 31, 2007
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
November 1, 2007 – November 30, 2007
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
October 1, 2007 – December 31, 2007
Resolved
Monitoring and Reporting (DBP)
—
TTHM
October 1, 2007 – December 31, 2007
Resolved
Maximum Contaminant Level Violation, Average
Health-based
TTHM
October 1, 2007 – December 31, 2007
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 2007 – September 30, 2007
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
July 1, 2007 – July 31, 2007
Resolved
Maximum Contaminant Level Violation, Average
Health-based
TTHM
April 1, 2007 – June 30, 2007
Resolved
Maximum Contaminant Level Violation, Average
Health-based
TTHM
January 1, 2007 – March 31, 2007
Resolved
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate-Nitrite
January 1, 2007 – March 31, 2007
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Uranium
October 1, 2006 – December 31, 2006
Resolved
Maximum Contaminant Level Violation, Average
Health-based
TTHM
October 1, 2006 – December 31, 2006
Resolved
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate-Nitrite
October 1, 2006 – December 31, 2006
Resolved
Monitoring and Reporting (DBP)
—
TTHM
April 1, 2006 – June 30, 2006
Resolved
Initial Tap Sampling for Pb and Cu
—
Lead and Copper Rule
June 1, 1993 – June 13, 1995
Resolved

Resolved addressed and confirmed by the stateAddressed corrective action reported, pending final confirmation

Period	Violation	Contaminant / rule	Health-based	Status
October 17, 2024 – July 15, 2025	LSL Inventory	LEAD AND COPPER RULE REVISIONS	Health-based	Resolved
October 17, 2024 – July 15, 2025	LSL Reporting	LEAD AND COPPER RULE REVISIONS	—	Resolved
October 1, 2022 – September 30, 2023	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
October 1, 2022 – September 30, 2023	Monitoring and Reporting (DBP)	TTHM	—	Resolved
October 1, 2021 – September 30, 2022	Monitoring and Reporting (DBP)	TTHM	—	Resolved
October 1, 2021 – September 30, 2022	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
August 19, 2019 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
July 1, 2019 – September 30, 2019	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
July 1, 2019 – February 11, 2020	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
July 1, 2019 – September 30, 2019	Monitoring and Reporting (DBP)	TTHM	—	Resolved
June 15, 2019 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
April 1, 2019 – June 30, 2019	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
April 1, 2019 – June 30, 2019	Monitoring and Reporting (DBP)	TTHM	—	Resolved
February 14, 2019 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
February 14, 2019 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
January 1, 2019 – March 31, 2019	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
January 1, 2019 – March 31, 2019	Monitoring and Reporting (DBP)	TTHM	—	Resolved
January 1, 2019 – February 11, 2020	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
November 14, 2018 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
October 1, 2018 – December 31, 2018	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
October 1, 2018 – December 31, 2018	Monitoring and Reporting (DBP)	TTHM	—	Resolved
August 19, 2018 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
July 18, 2018 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
July 1, 2018 – September 30, 2018	Monitoring and Reporting (DBP)	TTHM	—	Resolved
July 1, 2018 – February 11, 2020	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
July 1, 2018 – September 30, 2018	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
April 21, 2018 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
April 21, 2018 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
April 21, 2018 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
April 21, 2018 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
April 1, 2018 – June 30, 2018	Monitoring and Reporting (DBP)	TTHM	—	Resolved
April 1, 2018 – June 30, 2018	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
January 1, 2018 – February 11, 2020	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
October 1, 2017 – December 31, 2017	Monitoring and Reporting (DBP)	TTHM	—	Resolved
October 1, 2017 – December 31, 2017	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
July 1, 2017 – February 11, 2020	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
April 1, 2017 – June 30, 2017	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
March 12, 2017 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
March 12, 2017 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
March 12, 2017 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
March 12, 2017 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
January 2, 2017 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
January 1, 2017 – March 31, 2017	Monitoring and Reporting (DBP)	TTHM	—	Resolved
December 23, 2016 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
October 1, 2016 – December 31, 2016	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
July 30, 2016 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
July 1, 2016 – January 9, 2020	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2016 – February 11, 2020	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
May 4, 2016 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
April 1, 2016 – June 30, 2016	Monitoring and Reporting (DBP)	TTHM	—	Resolved
January 1, 2016 – February 11, 2020	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
January 1, 2016 – March 31, 2016	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
January 1, 2016 – March 31, 2016	Monitoring and Reporting (DBP)	TTHM	—	Resolved
October 1, 2015 – December 31, 2015	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
October 1, 2015 – December 31, 2015	Monitoring and Reporting (DBP)	TTHM	—	Resolved
September 14, 2015 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
July 1, 2015 – September 30, 2015	Monitoring and Reporting (DBP)	TTHM	—	Resolved
July 1, 2015 – September 30, 2015	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
July 1, 2015 – January 9, 2020	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2015 – February 11, 2020	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
April 1, 2015 – June 30, 2015	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
April 1, 2015 – June 30, 2015	Monitoring and Reporting (DBP)	TTHM	—	Resolved
January 1, 2015 – March 31, 2015	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
January 1, 2015 – March 31, 2015	Monitoring and Reporting (DBP)	TTHM	—	Resolved
January 1, 2015 – February 11, 2020	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
July 1, 2014 – February 11, 2020	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
July 1, 2014 – January 9, 2020	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2014 – February 11, 2020	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
November 1, 2013 – November 30, 2013	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2013 – January 9, 2020	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2013 – July 31, 2013	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
July 1, 2013 – February 11, 2020	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
June 1, 2013 – June 30, 2013	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved
June 1, 2013 – June 30, 2013	Monitoring, Source Water (GWR)	E. COLI	—	Resolved
January 1, 2013 – February 8, 2017	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
July 1, 2012 – February 11, 2020	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2012 – September 27, 2016	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
July 1, 2011 – February 11, 2020	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2011	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Addressed
January 1, 2011 – September 27, 2016	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
July 1, 2010 – September 27, 2016	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
July 1, 2010 – February 11, 2020	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
June 1, 2010 – June 30, 2010	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
October 1, 2009 – September 27, 2016	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
December 1, 2007 – December 31, 2007	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
November 1, 2007 – November 30, 2007	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
October 1, 2007 – December 31, 2007	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
October 1, 2007 – December 31, 2007	Monitoring and Reporting (DBP)	TTHM	—	Resolved
October 1, 2007 – December 31, 2007	Maximum Contaminant Level Violation, Average	TTHM	Health-based	Resolved
September 1, 2007 – September 30, 2007	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2007 – July 31, 2007	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
April 1, 2007 – June 30, 2007	Maximum Contaminant Level Violation, Average	TTHM	Health-based	Resolved
January 1, 2007 – March 31, 2007	Maximum Contaminant Level Violation, Average	TTHM	Health-based	Resolved
January 1, 2007 – March 31, 2007	Maximum Contaminant Level Violation, Single Sample	Nitrate-Nitrite	Health-based	Resolved
October 1, 2006 – December 31, 2006	Maximum Contaminant Level Violation, Average	Combined Uranium	Health-based	Resolved
October 1, 2006 – December 31, 2006	Maximum Contaminant Level Violation, Average	TTHM	Health-based	Resolved
October 1, 2006 – December 31, 2006	Maximum Contaminant Level Violation, Single Sample	Nitrate-Nitrite	Health-based	Resolved
April 1, 2006 – June 30, 2006	Monitoring and Reporting (DBP)	TTHM	—	Resolved
June 1, 1993 – June 13, 1995	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	—	Resolved

Resolved addressed and confirmed by the stateAddressed corrective action reported, pending final confirmation

Enforcement actions

July 11, 2025State Violation/Reminder Notice12 linked violations
February 11, 2020State Compliance achieved95 linked violations
January 9, 2020State Public Notification received28 linked violations
January 9, 2020State Public Notification received8 linked violations
August 26, 2019State Violation/Reminder Notice12 linked violations
August 26, 2019State Public Notification requested4 linked violations
August 26, 2019State Violation/Reminder Notice3 linked violations
May 31, 2019State Public Notification requested44 linked violations
February 25, 2019State Violation/Reminder Notice18 linked violations
August 14, 2018State Violation/Reminder Notice5 linked violations
August 14, 2018State Violation/Reminder Notice6 linked violations
February 13, 2018State Public Notification requested12 linked violations
February 13, 2018State Violation/Reminder Notice5 linked violations
November 27, 2017State Administrative/Compliance Order with penalty issued20 linked violations
November 13, 2017State Public Notification requested6 linked violations
August 18, 2017State Public Notification requested3 linked violations
July 17, 2017State Public Notification requested3 linked violations
April 20, 2017State Violation/Reminder Notice5 linked violations
March 2, 2017State Compliance achieved5 linked violations
September 27, 2016State Compliance achieved13 linked violations
August 4, 2016State Compliance achieved4 linked violations
August 4, 2016State Compliance achieved7 linked violations
August 4, 2016State Compliance achieved18 linked violations
April 28, 2016State Public Notification requested9 linked violations
April 28, 2016State Administrative/Compliance Order with penalty issued9 linked violations
May 4, 2015State Public Notification requested18 linked violations
March 17, 2015State Public Notification requested6 linked violations
January 10, 2014State Violation/Reminder Notice15 linked violations
January 10, 2014State Violation/Reminder Notice7 linked violations
November 30, 2013State Compliance achieved7 linked violations
September 10, 2010State Violation/Reminder Notice5 linked violations
January 27, 2010State Public Notification requested15 linked violations
March 18, 2009State Compliance achieved6 linked violations
September 14, 2007State Public Notification requested7 linked violations
December 12, 1995State Boil Water Order1 linked violation

Contact

HOLLISTER

580-597-3097

HOLLISTER, OK 73551