Public water system · IL0735200
ActiveOsco Mutual Water Supply Company, Inc..
At a glance
Osco Mutual Water Supply Company, Inc.. (PWSID IL0735200) is an active community water system in Henry County, Illinois. It reports serving 80 people through 50 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in July 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
80
Service connections
50
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Osco Mutual Water Supply Company, Inc.. compare with other water systems in Henry County?
By EPA's size categories, Osco Mutual Water Supply Company, Inc.. is a very small system (500 people or fewer). Henry County has 72 active public water systems. Its population served is well below the county average of 598 people per system, and accounts for 0.2% of the 43,076 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 Osco Mutual Water Supply Company, Inc.. 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 Osco Mutual Water Supply Company, Inc..?
EPA lists Osco Mutual Water Supply Company, Inc.. 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. 46 of the 72 active systems in Henry County (64%) are also privately owned.
Does Osco Mutual Water Supply Company, Inc.. have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in July 2025. The violations listed here began between September 2002 and July 2025. By type: 6 monitoring and reporting, 4 public notice, recordkeeping or other, 1 reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Chlorine (4 of them). EPA lists 9 as resolved, 2 as unaddressed and 1 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement. 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 |
|---|---|---|---|---|
| 2025-07-02 | ReportingNotification, Known or Potential LSL · code 4H | Lead and Copper Rule Revisionscode 5200 | No | Unaddressed |
| 2025-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Unaddressed |
| 2011-04-02 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2008-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2007-02-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2007-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2005-10-08 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2005-08-24 | Public notice, recordkeeping or otherPublic Notification Violation without NPDWR Violation · code 76 | Public Noticecode 7500 | No | Resolved |
| 2005-08-24 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2004-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2004-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2002-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | 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.
Osco Mutual Water Supply Company, Inc..: frequently asked questions
Who runs Osco Mutual Water Supply Company, Inc..?
Osco Mutual Water Supply Company, Inc.. (PWSID IL0735200) is a community water system privately owned. It is regulated by the IL state drinking water program.
How many people does Osco Mutual Water Supply Company, Inc.. serve?
Osco Mutual Water Supply Company, Inc.. reports serving 80 people through 50 service connections in Henry County, Illinois.
Where does Osco Mutual Water Supply Company, Inc.. 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 Osco Mutual Water Supply Company, Inc.. have any drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in July 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 Osco Mutual Water Supply Company, Inc..'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, one is health-based, and the most recent began in July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find Osco Mutual Water Supply Company, Inc..'s water quality report?
As a community water system, Osco Mutual Water Supply Company, Inc.. 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 Henry County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Kewanee | Henry | 12,509 | Community | Groundwater |
| Geneseo | Henry | 6,539 | Community | Groundwater |
| Colona West | Henry | 2,640 | Community | Groundwater |
| Colona East | Henry | 2,501 | Community | Groundwater |
| Galva | Henry | 2,449 | Community | Groundwater |
| Cambridge | Henry | 2,086 | 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, “Osco Mutual Water Supply Company, Inc.., PWSID IL0735200, Illinois”, https://aquacensus.com/water-systems/illinois/osco-mutual-water-supply-company-inc-il0735200 (data as of October 1, 2026).