Public water system · OK2005901
ActiveRalston
At a glance
Ralston (PWSID OK2005901) is an active community water system in Pawnee County, Oklahoma. It reports serving 335 people through 141 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
335
Service connections
141
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Ralston compare with other water systems in Pawnee County?
By EPA's size categories, Ralston is a very small system (500 people or fewer). Pawnee County has 14 active public water systems. Its population served is about 65% below the county average of 966 people per system, and accounts for 2.5% of the 13,527 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 Ralston 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 701 Oklahoma systems (56%) list groundwater as their primary source.
Who owns and regulates Ralston?
EPA lists Ralston 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. 12 of the 14 active systems in Pawnee County (86%) are also owned by a local government.
Does Ralston have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2025. The violations listed here began between October 2025 and October 2025. By type: 12 monitoring and reporting. The contaminants or rules involved are Di(2-ethylhexyl) adipate, Pentachlorophenol, Dalapon and 1,2-Dibromo-3-chloropropane (DBCP). EPA lists 12 as archived. 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 |
|---|---|---|---|---|
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Di(2-ethylhexyl) adipatecode 2035 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Pentachlorophenolcode 2326 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Dalaponcode 2031 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2-Dibromo-3-chloropropane (DBCP)code 2931 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Picloramcode 2040 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Hexachlorocyclopentadienecode 2042 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Endrincode 2005 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Diquatcode 2032 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Benzo(a)pyrenecode 2306 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Di(2-ethylhexyl) phthalatecode 2039 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Dinosebcode 2041 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Lindane (gamma-BHC)code 2010 | No | 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.
Ralston: frequently asked questions
Who runs Ralston?
Ralston (PWSID OK2005901) is a community water system owned by a local government. It is regulated by the OK state drinking water program.
How many people does Ralston serve?
Ralston reports serving 335 people through 141 service connections in Pawnee County, Oklahoma.
Where does Ralston get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Ralston have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 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 Ralston'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, none is health-based, and the most recent began in October 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 Ralston's water quality report?
As a community water system, Ralston 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 Pawnee County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Cleveland Municipal Authority | Pawnee | 3,262 | Community | Surface water |
| Pawnee Co Rwd #1 | Pawnee | 3,200 | Community | Groundwater |
| Pawnee | Pawnee | 2,230 | Community | Surface water |
| Pawnee Co Rwd #2 | Pawnee | 1,775 | Community | Purchased surface water |
| Pawnee Co Rwd #3 | Pawnee | 685 | Community | Purchased surface water |
| Pawnee Co Rwd #4 | Pawnee | 415 | Community | Purchased surface water |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Ralston, PWSID OK2005901, Oklahoma”, https://aquacensus.com/water-systems/oklahoma/ralston-ok2005901 (data as of October 1, 2026).