Is WISTER required to publish a Consumer Confidence Report?

Yes. WISTER 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 WISTER’s next Consumer Confidence Report due?

WISTER’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.

WISTER, OK · Le Flore County

WISTER Water System

Consumer Confidence Report status

WISTER 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 no open violations for WISTER.

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): OK3004014
System type: Community Water System
Population served: 1,002
Service connections: 612
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

WISTER is one of 511 community water systems in Oklahoma in the 501 to 3,300 people size category, serving 1,002 people from surface water.

As of August 1, 2026, its federal record holds 10 entries between 1993 and 2025, all of which EPA lists as closed.

All 10 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 Total Coliform Rules, the Stage 2 Disinfectants and Disinfection Byproducts Rule, and the Lead and Copper Rule.

Violation history

Failure Submit IDSE/Subpart V Plan Rpt
—
Total Haloacetic Acids (HAA5)
September 29, 2025 – November 7, 2025
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
July 1, 2024 – December 4, 2024
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
July 1, 2023 – December 15, 2023
Resolved
Monitoring, Routine (IDSE)
—
TTHM
June 1, 2009 – August 31, 2009
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
October 1, 2005 – October 31, 2005
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
December 1, 2000 – December 31, 2000
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 2000 – September 30, 2000
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
June 1, 2000 – June 30, 2000
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 1999 – September 30, 1999
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 1993 – September 30, 1993
Resolved

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
September 29, 2025 – November 7, 2025	Failure Submit IDSE/Subpart V Plan Rpt	Total Haloacetic Acids (HAA5)	—	Resolved
July 1, 2024 – December 4, 2024	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
July 1, 2023 – December 15, 2023	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
June 1, 2009 – August 31, 2009	Monitoring, Routine (IDSE)	TTHM	—	Resolved
October 1, 2005 – October 31, 2005	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
December 1, 2000 – December 31, 2000	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
September 1, 2000 – September 30, 2000	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
June 1, 2000 – June 30, 2000	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
September 1, 1999 – September 30, 1999	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
September 1, 1993 – September 30, 1993	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

November 7, 2025State Compliance achieved1 linked violation
November 5, 2025State Violation/Reminder Notice1 linked violation
May 2, 2025State Public Notification received1 linked violation
December 4, 2024State Compliance achieved1 linked violation
August 21, 2024State Violation/Reminder Notice1 linked violation
August 21, 2024State Public Notification requested1 linked violation
June 3, 2024State Public Notification received1 linked violation
December 15, 2023State Compliance achieved1 linked violation
August 30, 2023State Public Notification requested1 linked violation
August 30, 2023State Violation/Reminder Notice1 linked violation
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achieved1 linked violation
August 4, 2016State Compliance achieved1 linked violation
August 4, 2016State Compliance achieved1 linked violation
August 4, 2016State Compliance achieved1 linked violation
August 4, 2016State Compliance achieved1 linked violation
May 8, 2014State Compliance achieved1 linked violation
May 8, 2014State Compliance achieved1 linked violation
May 8, 2014State Compliance achieved1 linked violation
May 8, 2014State Compliance achieved1 linked violation
May 8, 2014State Compliance achieved1 linked violation
May 8, 2014State Compliance achieved1 linked violation
July 24, 2009Federal Violation/Reminder Notice2 linked violations
December 9, 2008Federal Violation/Reminder Notice2 linked violations
November 16, 2005State Public Notification requested5 linked violations
November 16, 2005State Violation/Reminder Notice7 linked violations
April 26, 2001State Violation/Reminder Notice10 linked violations

Common questions

Is WISTER required to publish a Consumer Confidence Report?: Yes. WISTER 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 WISTER’s next Consumer Confidence Report due?: WISTER’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does WISTER have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for WISTER.
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

WISTER

918-647-7955

WISTER, OK 74966