Public water system · IL0955200
ActiveAqua Illinois-Oak Run
At a glance
Aqua Illinois-Oak Run (PWSID IL0955200) is an active community water system in Knox County, Illinois. It reports serving 1,885 people through 754 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 5 violations for this system; 2 are health-based, and the most recent began in January 1995.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,885
Service connections
754
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Aqua Illinois-Oak Run compare with other water systems in Knox County?
By EPA's size categories, Aqua Illinois-Oak Run is a small system (501 to 3,300 people). Knox County has 34 active public water systems, and Aqua Illinois-Oak Run is the 5th-largest of them by population served. Its population served is about 31% above the county average of 1,442 people per system, and accounts for 3.8% of the 49,041 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 Aqua Illinois-Oak Run 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,808 Illinois systems (73%) list groundwater as their primary source.
Who owns and regulates Aqua Illinois-Oak Run?
EPA lists Aqua Illinois-Oak Run as privately owned. 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. 15 of the 34 active systems in Knox County (44%) are also privately owned.
Does Aqua Illinois-Oak Run have drinking water violations?
EPA's records list 5 violations for this system; 2 are health-based, and the most recent began in January 1995. The violations listed here began between June 1977 and January 1995. By type: 3 monitoring and reporting and 2 contaminant level above the legal limit. The contaminant or rule involved most often is Fluoride (2 of them). EPA lists 3 as archived and 2 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 |
|---|---|---|---|---|
| 1995-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1991-08-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1984-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Fluoridecode 1025 | Yes | Resolved |
| 1981-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Fluoridecode 1025 | Yes | Archived |
| 1977-06-30 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
All 5 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.
Aqua Illinois-Oak Run: frequently asked questions
Who runs Aqua Illinois-Oak Run?
Aqua Illinois-Oak Run (PWSID IL0955200) is a community water system privately owned. It is regulated by the IL state drinking water program.
How many people does Aqua Illinois-Oak Run serve?
Aqua Illinois-Oak Run reports serving 1,885 people through 754 service connections in Knox County, Illinois.
Where does Aqua Illinois-Oak Run 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 Aqua Illinois-Oak Run have any drinking water violations?
EPA's records list 5 violations for this system; 2 are health-based, and the most recent began in January 1995. 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 Aqua Illinois-Oak Run'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 5 violations for this system; 2 are health-based, and the most recent began in January 1995. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find Aqua Illinois-Oak Run's water quality report?
As a community water system, Aqua Illinois-Oak Run 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 Knox County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Galesburg | Knox | 31,620 | Community | Groundwater |
| Abingdon | Knox | 3,275 | Community | Purchased groundwater |
| Knoxville | Knox | 3,120 | Community | Purchased groundwater |
| I74 Spoon River Rest Area | Knox | 2,356 | Transient non-community | Groundwater |
| Wataga | Knox | 965 | Community | Groundwater |
| East Galesburg | Knox | 860 | Community | Purchased 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, “Aqua Illinois-Oak Run, PWSID IL0955200, Illinois”, https://aquacensus.com/water-systems/illinois/aqua-illinois-oak-run-il0955200 (data as of October 1, 2026).