Public water system · IL1890400
ActiveOkawville
At a glance
Okawville (PWSID IL1890400) is an active community water system in Washington County, Illinois. It reports serving 1,457 people through 695 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 8 violations for this system; 4 are health-based, and the most recent began in January 2026.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,457
Service connections
695
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Okawville compare with other water systems in Washington County?
By EPA's size categories, Okawville is a small system (501 to 3,300 people). Washington County has 15 active public water systems, and Okawville is the 3rd-largest of them by population served. Its population served is roughly in line with the county average of 1,367 people per system, and accounts for 7.1% of the 20,507 people reported by systems filed under the county. Across Illinois, the 3,872 active systems average 3,204 people each. Nationally, the average active community water system reports serving 6,703 people, so Okawville 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. Illinois has 1,773 active community water systems, 46% of the state's 3,872 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 619 Illinois systems (16%) list purchased surface water as their primary source.
Who owns and regulates Okawville?
EPA lists Okawville as owned by a local government. The IL 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 15 active systems in Washington County (60%) are also owned by a local government.
Does Okawville have drinking water violations?
EPA's records list 8 violations for this system; 4 are health-based, and the most recent began in January 2026. The violations listed here began between June 1977 and January 2026. By type: 4 monitoring and reporting, 3 contaminant level above the legal limit and 1 required treatment not met. The contaminant or rule involved most often is Total trihalomethanes (TTHM) (3 of them). EPA lists 4 as archived and 4 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 |
|---|---|---|---|---|
| 2026-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Archived |
| 2018-01-01 | Required treatment not metSingle Turbidity Exceed (Enhanced SWTR) · code 43 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 2007-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2007-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2007-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 1999-01-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1995-09-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1977-06-30 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
All 8 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.
Okawville: frequently asked questions
Who runs Okawville?
Okawville (PWSID IL1890400) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Okawville serve?
Okawville reports serving 1,457 people through 695 service connections in Washington County, Illinois.
Where does Okawville 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 Okawville have any drinking water violations?
EPA's records list 8 violations for this system; 4 are health-based, and the most recent began in January 2026. 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 Okawville'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. EPA's records list 8 violations for this system; 4 are health-based, and the most recent began in January 2026. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find Okawville's water quality report?
As a community water system, Okawville 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 Washington County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Washington County Water Company | Washington | 11,374 | Community | Purchased surface water |
| Nashville | Washington | 3,230 | Community | Surface water |
| Irvington | Washington | 1,081 | Community | Purchased surface water |
| Hoyleton Rwc | Washington | 1,020 | Community | Purchased surface water |
| Hoyleton | Washington | 658 | Community | Purchased surface water |
| Ashley | Washington | 565 | Community | Purchased 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, “Okawville, PWSID IL1890400, Illinois”, https://aquacensus.com/water-systems/illinois/okawville-il1890400 (data as of October 1, 2026).