Public water system · OK1010809
ActiveDuncan Public Utilities Authority
At a glance
Duncan Public Utilities Authority (PWSID OK1010809) is an active community water system in Stephens County, Oklahoma. It reports serving 23,000 people through 10,938 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in December 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
23,000
Service connections
10,938
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Duncan Public Utilities Authority compare with other water systems in Stephens County?
By EPA's size categories, Duncan Public Utilities Authority is a large system (10,001 to 100,000 people). Stephens County has 10 active public water systems, and Duncan Public Utilities Authority is the largest of them by population served. Its population served is about 5.9 times the county average of 3,870 people per system, and accounts for 59% of the 38,695 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 Duncan Public Utilities Authority is about 3.4 times 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 175 Oklahoma systems (14%) list surface water as their primary source.
Who owns and regulates Duncan Public Utilities Authority?
EPA lists Duncan Public Utilities Authority 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. 6 of the 10 active systems in Stephens County (60%) are also owned by a local government.
Does Duncan Public Utilities Authority have drinking water violations?
Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in December 2025. The violations listed here began between April 2020 and December 2025. By type: 4 monitoring and reporting, 4 required treatment not met, 2 monitoring and 2 contaminant level above the legal limit. The contaminant or rule involved most often is Carbon, total (6 of them). EPA lists 7 as archived and 5 as resolved. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status. 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 |
|---|---|---|---|---|
| 2025-12-01 | MonitoringMonitoring, Lab Certification/Method Error (RTCR) · code 3D | Revised Total Coliform Rulecode 8000 | No | Archived |
| 2025-11-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chloraminecode 1006 | No | Resolved |
| 2024-11-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chloraminecode 1006 | No | Resolved |
| 2024-11-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2024-10-01 | Required treatment not metTreatment Technique Precursor Removal · code 46 | Carbon, totalcode 2920 | Yes | Archived |
| 2024-08-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Carbon, totalcode 2920 | No | Resolved |
| 2024-08-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Carbon, totalcode 2920 | No | Resolved |
| 2024-07-01 | Required treatment not metTreatment Technique Precursor Removal · code 46 | Carbon, totalcode 2920 | Yes | Archived |
| 2024-04-01 | Required treatment not metTreatment Technique Precursor Removal · code 46 | Carbon, totalcode 2920 | Yes | Archived |
| 2024-01-01 | Required treatment not metTreatment Technique Precursor Removal · code 46 | Carbon, totalcode 2920 | Yes | Archived |
| 2023-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Archived |
| 2020-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Archived |
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.
Duncan Public Utilities Authority: frequently asked questions
Who runs Duncan Public Utilities Authority?
Duncan Public Utilities Authority (PWSID OK1010809) is a community water system owned by a local government. It is regulated by the OK state drinking water program.
How many people does Duncan Public Utilities Authority serve?
Duncan Public Utilities Authority reports serving 23,000 people through 10,938 service connections in Stephens County, Oklahoma.
Where does Duncan Public Utilities Authority get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Duncan Public Utilities Authority have any drinking water violations?
Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in December 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 Duncan Public Utilities Authority'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, 6 are health-based, and the most recent began in December 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 Duncan Public Utilities Authority's water quality report?
As a community water system, Duncan Public Utilities Authority 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 Stephens County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Stephens Co Rwd #5 | Stephens | 6,426 | Community | Purchased surface water |
| Marlow Municipal Authority | Stephens | 4,600 | Community | Groundwater |
| Comanche Public Works Authority | Stephens | 1,649 | Community | Surface water |
| Stephens Co Rwd #3 (Meridian) | Stephens | 1,610 | Community | Purchased surface water |
| Stephens Co Rw&Sd #1 | Stephens | 960 | Community | Groundwater |
| Bible Missionary Church Camp | Stephens | 275 | Transient non-community | Groundwater |
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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, “Duncan Public Utilities Authority, PWSID OK1010809, Oklahoma”, https://aquacensus.com/water-systems/oklahoma/duncan-public-utilities-authority-ok1010809 (data as of October 1, 2026).