Is HOLLISTER required to publish a Consumer Confidence Report?

Yes. HOLLISTER is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is HOLLISTER’s next Consumer Confidence Report due?

HOLLISTER’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

HOLLISTER, OK · Tillman County

HOLLISTER Water System

Consumer Confidence Report status

HOLLISTER must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show 1 item for HOLLISTER that is open and awaiting resolution. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 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)

HOLLISTER is one of 1,277 community water systems in Oklahoma in the 500 or fewer people size category, serving 60 people from groundwater.

As of August 1, 2026, its federal record holds 98 entries between 1991 and 2024, of which 1 remains open; none are health-based.

Of the 98, 65 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Stage 2 Disinfectants and Disinfection Byproducts Rule, the Lead and Copper Rule, and the Public Notice Rule and Revised PN Rule.

Violation history

LSL Reporting
—
LEAD AND COPPER RULE REVISIONS
October 17, 2024 – July 15, 2025
Resolved
LSL Inventory
Health-based
LEAD AND COPPER RULE REVISIONS
October 17, 2024 – July 15, 2025
Resolved
Monitoring and Reporting (DBP)
—
TTHM
October 1, 2022 – September 30, 2023
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
October 1, 2022 – September 30, 2023
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
October 1, 2021 – September 30, 2022
Resolved
Monitoring and Reporting (DBP)
—
TTHM
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
Monitoring and Reporting (DBP)
—
TTHM
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
Public Notification Violation for NPDWR Violation
—
Public Notice
June 15, 2019 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
TTHM
April 1, 2019 – June 30, 2019
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
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
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 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
Public Notification Violation for NPDWR Violation
—
Public Notice
November 14, 2018 – February 11, 2020
Resolved
Monitoring and Reporting (DBP)
—
TTHM
October 1, 2018 – December 31, 2018
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
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)
—
Total Haloacetic Acids (HAA5)
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)
—
TTHM
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)
—
Total Haloacetic Acids (HAA5)
April 1, 2018 – June 30, 2018
Resolved
Monitoring and Reporting (DBP)
—
TTHM
April 1, 2018 – June 30, 2018
Resolved
Monitoring and Reporting (DBP)
—
TTHM
January 1, 2018 – March 31, 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)
—
Total Haloacetic Acids (HAA5)
January 1, 2018 – March 31, 2018
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)
—
TTHM
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
Public Notification Violation for NPDWR Violation
—
Public Notice
July 30, 2016 – February 11, 2020
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
July 1, 2016 – February 11, 2020
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2016 – January 9, 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
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
April 1, 2016 – June 30, 2016
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
January 1, 2016 – March 31, 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)
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
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2015 – January 9, 2020
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
July 1, 2015 – September 30, 2015
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)
—
TTHM
January 1, 2015 – March 31, 2015
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
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 – September 27, 2016
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
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 and Reporting (DBP)
—
TTHM
October 1, 2007 – December 31, 2007
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
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
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, Average
Health-based
TTHM
October 1, 2006 – December 31, 2006
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Uranium
October 1, 2006 – December 31, 2006
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
August 1, 1996 – August 31, 1996
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
February 1, 1994 – February 28, 1994
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
August 1, 1993 – August 31, 1993
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
September 1, 1991 – September 30, 1991
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
August 1, 1991 – August 31, 1991
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 Reporting	LEAD AND COPPER RULE REVISIONS	—	Resolved
October 17, 2024 – July 15, 2025	LSL Inventory	LEAD AND COPPER RULE REVISIONS	Health-based	Resolved
October 1, 2022 – September 30, 2023	Monitoring and Reporting (DBP)	TTHM	—	Resolved
October 1, 2022 – September 30, 2023	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
October 1, 2021 – September 30, 2022	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
October 1, 2021 – September 30, 2022	Monitoring and Reporting (DBP)	TTHM	—	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 – September 30, 2019	Monitoring and Reporting (DBP)	TTHM	—	Resolved
July 1, 2019 – February 11, 2020	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	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)	TTHM	—	Resolved
April 1, 2019 – June 30, 2019	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	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 – February 11, 2020	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	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
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)	TTHM	—	Resolved
October 1, 2018 – December 31, 2018	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	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)	Total Haloacetic Acids (HAA5)	—	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)	TTHM	—	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)	Total Haloacetic Acids (HAA5)	—	Resolved
April 1, 2018 – June 30, 2018	Monitoring and Reporting (DBP)	TTHM	—	Resolved
January 1, 2018 – March 31, 2018	Monitoring and Reporting (DBP)	TTHM	—	Resolved
January 1, 2018 – February 11, 2020	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
January 1, 2018 – March 31, 2018	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	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)	TTHM	—	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
July 30, 2016 – February 11, 2020	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
July 1, 2016 – February 11, 2020	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
July 1, 2016 – January 9, 2020	Consumer Confidence Report Complete Failure to Report	Consumer Confidence 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
April 1, 2016 – June 30, 2016	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
January 1, 2016 – March 31, 2016	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
January 1, 2016 – February 11, 2020	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	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 – January 9, 2020	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2015 – September 30, 2015	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	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)	TTHM	—	Resolved
January 1, 2015 – March 31, 2015	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	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 – September 27, 2016	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
January 1, 2011	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Addressed
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
October 1, 2007 – December 31, 2007	Monitoring and Reporting (DBP)	TTHM	—	Resolved
October 1, 2007 – December 31, 2007	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	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
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
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, Average	Combined Uranium	Health-based	Resolved
August 1, 1996 – August 31, 1996	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
February 1, 1994 – February 28, 1994	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
August 1, 1993 – August 31, 1993	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
September 1, 1991 – September 30, 1991	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
August 1, 1991 – August 31, 1991	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved

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

Enforcement actions

January 9, 2020State Public Notification received56 linked violations
January 9, 2020State Public Notification received6 linked violations
January 9, 2020State Public Notification received21 linked violations
January 9, 2020State Compliance achieved31 linked violations
November 21, 2019State Public Notification requested7 linked violations
August 26, 2019State Public Notification requested4 linked violations
August 26, 2019State Violation/Reminder Notice12 linked violations
May 31, 2019State Violation/Reminder Notice5 linked violations
February 25, 2019State Public Notification requested18 linked violations
November 15, 2018State Public Notification requested3 linked violations
August 14, 2018State Public Notification requested6 linked violations
June 14, 2018State Public Notification requested7 linked violations
June 14, 2018State Violation/Reminder Notice17 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 Violation/Reminder Notice4 linked violations
April 20, 2017State Public Notification requested7 linked violations
April 20, 2017State Public Notification requested7 linked violations
December 2, 2016State Public Notification requested12 linked violations
August 4, 2016State Compliance achieved7 linked violations
August 4, 2016State Compliance achieved7 linked violations
August 4, 2016State Compliance achieved5 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 Violation/Reminder Notice8 linked violations
January 10, 2014State Violation/Reminder Notice8 linked violations
November 30, 2013State Compliance achieved7 linked violations
July 31, 2013State Compliance achieved7 linked violations
May 10, 2010State Compliance achieved16 linked violations
March 18, 2010State Violation/Reminder Notice11 linked violations
March 18, 2009State Compliance achieved6 linked violations
October 11, 2007State Public Notification received12 linked violations
August 22, 2007State Public Notification requested10 linked violations
December 12, 1995State Boil Water Order1 linked violation

Common questions

Is HOLLISTER required to publish a Consumer Confidence Report?: Yes. HOLLISTER is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is HOLLISTER’s next Consumer Confidence Report due?: HOLLISTER’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does HOLLISTER have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show 1 item for HOLLISTER that is open and awaiting resolution. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings.
What is a Consumer Confidence Report?: A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

HOLLISTER

580-597-3097

HOLLISTER, OK 73551