Public water system · OK3004014
ActiveWister
At a glance
Wister (PWSID OK3004014) is an active community water system in Le Flore County, Oklahoma. It reports serving 1,002 people through 612 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in September 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,002
Service connections
612
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Wister compare with other water systems in Le Flore County?
By EPA's size categories, Wister is a small system (501 to 3,300 people). Le Flore County has 21 active public water systems. Its population served is about 56% below the county average of 2,252 people per system, and accounts for 2.1% of the 47,285 people reported by systems filed under the county. Across Oklahoma, the 1,254 active systems average 2,907 people each. Nationally, the average active community water system reports serving 6,703 people, so Wister is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Oklahoma has 864 active community water systems, 69% of the state's 1,254 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 299 Oklahoma systems (24%) list purchased surface water as their primary source.
Who owns and regulates Wister?
EPA lists Wister as owned by a local government. The OK state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 20 of the 21 active systems in Le Flore County (95%) are also owned by a local government.
Does Wister have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in September 2025. The violations listed here began between January 2001 and September 2025. By type: 11 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (5 of them). EPA lists 12 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-09-29 | Monitoring and reportingFailure Submit IDSE/Subpart V Plan Rpt · code 35 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2024-07-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2023-07-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2009-06-01 | Monitoring and reportingMonitoring, Routine (IDSE) · code 30 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2009-06-01 | Monitoring and reportingMonitoring, Routine (IDSE) · code 30 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2008-05-01 | Monitoring and reportingMonitoring, Routine (IDSE) · code 30 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2008-05-01 | Monitoring and reportingMonitoring, Routine (IDSE) · code 30 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2005-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2005-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2001-03-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2001-02-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2001-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Wister: frequently asked questions
Who runs Wister?
Wister (PWSID OK3004014) is a community water system owned by a local government. It is regulated by the OK state drinking water program.
How many people does Wister serve?
Wister reports serving 1,002 people through 612 service connections in Le Flore County, Oklahoma.
Where does Wister get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Wister have any drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in September 2025. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Wister's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in September 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the OK state drinking water program.
Where can I find Wister's water quality report?
As a community water system, Wister must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Le Flore County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Leflore Co. Rwd #14 | Le Flore | 9,077 | Community | Purchased surface water |
| Poteau Pwa | Le Flore | 7,939 | Community | Purchased surface water |
| Leflore Co. Rwd #2 | Le Flore | 4,700 | Community | Purchased surface water |
| Leflore Co. Rwd #18 | Le Flore | 3,870 | Community | Purchased surface water |
| Heavener Utility Auth - Psg | Le Flore | 3,000 | Community | Purchased surface water |
| Spiro | Le Flore | 2,200 | Community | Surface water |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Wister, PWSID OK3004014, Oklahoma”, https://aquacensus.com/water-systems/oklahoma/wister-ok3004014 (data as of October 1, 2026).