Public water system · IL2010500
ActiveWinnebago
At a glance
Winnebago (PWSID IL2010500) is an active community water system in Winnebago County, Illinois. It reports serving 2,940 people through 1,212 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 2002.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
2,940
Service connections
1,212
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Winnebago compare with other water systems in Winnebago County?
By EPA's size categories, Winnebago is a small system (501 to 3,300 people). Winnebago County has 137 active public water systems. Its population served is about 60% above the county average of 1,841 people per system, and accounts for 1.2% of the 252,201 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 Winnebago is about 56% 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 Winnebago?
EPA lists Winnebago 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. 19 of the 137 active systems in Winnebago County (14%) are also owned by a local government.
Does Winnebago 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 2002. The violations listed here began between October 2002 and October 2002. By type: 12 monitoring and reporting. The contaminants or rules involved are 1,1-Dichloroethylene, 1,1,1-Trichloroethane, 1,2-Dichloroethane and 1,1,2-Trichloroethane. 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 |
|---|---|---|---|---|
| 2002-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1-Dichloroethylenecode 2977 | No | Resolved |
| 2002-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1,1-Trichloroethanecode 2981 | No | Resolved |
| 2002-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2-Dichloroethanecode 2980 | No | Resolved |
| 2002-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1,2-Trichloroethanecode 2985 | No | Resolved |
| 2002-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Tetrachloroethylenecode 2987 | No | Resolved |
| 2002-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toluenecode 2991 | No | Resolved |
| 2002-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Carbon tetrachloridecode 2982 | No | Resolved |
| 2002-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Xylenes, Totalcode 2955 | No | Resolved |
| 2002-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Dichloromethanecode 2964 | No | Resolved |
| 2002-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | o-Dichlorobenzenecode 2968 | No | Resolved |
| 2002-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | p-Dichlorobenzenecode 2969 | No | Resolved |
| 2002-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | trans-1,2-Dichloroethylenecode 2979 | 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.
Winnebago: frequently asked questions
Who runs Winnebago?
Winnebago (PWSID IL2010500) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Winnebago serve?
Winnebago reports serving 2,940 people through 1,212 service connections in Winnebago County, Illinois.
Where does Winnebago 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 Winnebago 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 2002. 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 Winnebago'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 2002. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find Winnebago's water quality report?
As a community water system, Winnebago 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 Winnebago County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Rockford | Winnebago | 147,051 | Community | Groundwater |
| North Park PWD | Winnebago | 35,580 | Community | Groundwater |
| Loves Park | Winnebago | 23,335 | Community | Groundwater |
| Il American-South Beloit | Winnebago | 7,893 | Community | Purchased groundwater |
| Rockton | Winnebago | 7,685 | Community | Groundwater |
| Cherry Valley | Winnebago | 4,731 | 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, “Winnebago, PWSID IL2010500, Illinois”, https://aquacensus.com/water-systems/illinois/winnebago-il2010500 (data as of October 1, 2026).