Public water system · OK1010815
ActiveTishomingo Municipal Authority
At a glance
Tishomingo Municipal Authority (PWSID OK1010815) is an active community water system in Johnston County, Oklahoma. It reports serving 3,000 people through 1,219 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, 7 are health-based, and the most recent began in November 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
3,000
Service connections
1,219
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Tishomingo Municipal Authority compare with other water systems in Johnston County?
By EPA's size categories, Tishomingo Municipal Authority is a small system (501 to 3,300 people). Johnston County has 13 active public water systems, and Tishomingo Municipal Authority is the largest of them by population served. Its population served is about 3.8 times the county average of 792 people per system, and accounts for 29% of the 10,296 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 Tishomingo Municipal Authority is about 55% 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. 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 Tishomingo Municipal Authority?
EPA lists Tishomingo Municipal 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. 9 of the 13 active systems in Johnston County (69%) are also owned by a local government.
Does Tishomingo Municipal Authority have drinking water violations?
Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in November 2025. The violations listed here began between June 2024 and November 2025. By type: 7 required treatment not met, 3 monitoring and reporting, 1 monitoring and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Interim Enhanced Surface Water Treatment Rule (3 of them). EPA lists 7 as resolved and 5 as archived. 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. 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.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-11-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2025-11-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2025-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2025-06-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2025-03-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Archived |
| 2025-01-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Archived |
| 2025-01-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Archived |
| 2025-01-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Archived |
| 2025-01-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2024-11-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Archived |
| 2024-07-01 | Required treatment not metSingle Turbidity Exceed (Enhanced SWTR) · code 43 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 2024-06-01 | Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | 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.
Tishomingo Municipal Authority: frequently asked questions
Who runs Tishomingo Municipal Authority?
Tishomingo Municipal Authority (PWSID OK1010815) is a community water system owned by a local government. It is regulated by the OK state drinking water program.
How many people does Tishomingo Municipal Authority serve?
Tishomingo Municipal Authority reports serving 3,000 people through 1,219 service connections in Johnston County, Oklahoma.
Where does Tishomingo Municipal 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 Tishomingo Municipal Authority have any drinking water violations?
Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in November 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 Tishomingo Municipal 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, 7 are health-based, and the most recent began in November 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 Tishomingo Municipal Authority's water quality report?
As a community water system, Tishomingo Municipal 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 Johnston County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Johnston Co Rwd #3 | Johnston | 2,783 | Community | Groundwater |
| Murray State College | Johnston | 1,150 | Community | Surface water |
| Johnston Co Rws& Swmd #4 | Johnston | 600 | Community | Groundwater |
| Mannsville Public Works Authority | Johnston | 587 | Community | Groundwater |
| Ravia | Johnston | 459 | Community | Groundwater |
| Sundowner Trailer | Johnston | 450 | Non-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, “Tishomingo Municipal Authority, PWSID OK1010815, Oklahoma”, https://aquacensus.com/water-systems/oklahoma/tishomingo-municipal-authority-ok1010815 (data as of October 1, 2026).