Public water system · OK2003518
ActiveWapanucka
At a glance
Wapanucka (PWSID OK2003518) is an active community water system in Johnston County, Oklahoma. It reports serving 420 people through 207 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 January 2021.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
420
Service connections
207
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Wapanucka compare with other water systems in Johnston County?
By EPA's size categories, Wapanucka is a very small system (500 people or fewer). Johnston County has 13 active public water systems. Its population served is about half of the county average of 792 people per system, and accounts for 4.1% 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 Wapanucka 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 Wapanucka?
EPA lists Wapanucka 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 Wapanucka have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2021. The violations listed here began between January 2021 and January 2021. By type: 12 monitoring and reporting. The contaminants or rules involved are Alachlor (Lasso), Endothall, Carbofuran and Hexachlorocyclopentadiene. 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 |
|---|---|---|---|---|
| 2021-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Alachlor (Lasso)code 2051 | No | Resolved |
| 2021-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Endothallcode 2033 | No | Resolved |
| 2021-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Carbofurancode 2046 | No | Resolved |
| 2021-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Hexachlorocyclopentadienecode 2042 | No | Resolved |
| 2021-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Methoxychlorcode 2015 | No | Resolved |
| 2021-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Lindane (gamma-BHC)code 2010 | No | Resolved |
| 2021-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Dalaponcode 2031 | No | Resolved |
| 2021-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Endrincode 2005 | No | Resolved |
| 2021-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Simazinecode 2037 | No | Resolved |
| 2021-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Diquatcode 2032 | No | Resolved |
| 2021-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Atrazinecode 2050 | No | Resolved |
| 2021-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Heptachlorcode 2065 | 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.
Wapanucka: frequently asked questions
Who runs Wapanucka?
Wapanucka (PWSID OK2003518) is a community water system owned by a local government. It is regulated by the OK state drinking water program.
How many people does Wapanucka serve?
Wapanucka reports serving 420 people through 207 service connections in Johnston County, Oklahoma.
Where does Wapanucka 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 Wapanucka 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 January 2021. 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 Wapanucka'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 January 2021. For current results, consult the system's annual water quality report, EPA ECHO, or the OK state drinking water program.
Where can I find Wapanucka's water quality report?
As a community water system, Wapanucka 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 |
|---|---|---|---|---|
| Tishomingo Municipal Authority | Johnston | 3,000 | Community | Surface water |
| 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 |
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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, “Wapanucka, PWSID OK2003518, Oklahoma”, https://aquacensus.com/water-systems/oklahoma/wapanucka-ok2003518 (data as of October 1, 2026).