Public water system · WI1130267
ActiveWindsor Water Utility South
At a glance
Windsor Water Utility South (PWSID WI1130267) is an active community water system in Dane County, Wisconsin. It reports serving 4,607 people through 1,706 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in November 1994.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
4,607
Service connections
1,706
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Windsor Water Utility South compare with other water systems in Dane County?
By EPA's size categories, Windsor Water Utility South is a medium system (3,301 to 10,000 people). Dane County has 300 active public water systems. Its population served is about 164% above the county average of 1,742 people per system, and accounts for 0.9% of the 522,696 people reported by systems filed under the county. Across Wisconsin, the 11,056 active systems average 469 people each. Nationally, the average active community water system reports serving 6,703 people, so Windsor Water Utility South is about 31% 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. Wisconsin has 1,053 active community water systems, 9.5% of the state's 11,056 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 10,978 Wisconsin systems (99%) list groundwater as their primary source.
Who owns and regulates Windsor Water Utility South?
EPA lists Windsor Water Utility South as owned by a local government. The WI state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 74 of the 300 active systems in Dane County (25%) are also owned by a local government.
Does Windsor Water Utility South have drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in November 1994. The violations listed here began between September 1994 and November 1994. By type: 2 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 2 as resolved 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. 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 |
|---|---|---|---|---|
| 1994-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1994-09-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1994-09-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
All 3 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.
Windsor Water Utility South: frequently asked questions
Who runs Windsor Water Utility South?
Windsor Water Utility South (PWSID WI1130267) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Windsor Water Utility South serve?
Windsor Water Utility South reports serving 4,607 people through 1,706 service connections in Dane County, Wisconsin.
Where does Windsor Water Utility South 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 Windsor Water Utility South have any drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in November 1994. 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 Windsor Water Utility South'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 3 violations for this system; 1 is health-based, and the most recent began in November 1994. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Windsor Water Utility South's water quality report?
As a community water system, Windsor Water Utility South 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 Dane County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Madison Water Utility | Dane | 272,000 | Community | Groundwater |
| Sun Prairie Utilities | Dane | 39,300 | Community | Groundwater |
| Fitchburg Utility Dist 1 | Dane | 24,500 | Community | Groundwater |
| Middleton Waterworks | Dane | 23,868 | Community | Groundwater |
| Waunakee Waterworks | Dane | 14,879 | Community | Groundwater |
| Verona Waterworks | Dane | 14,030 | 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, “Windsor Water Utility South, PWSID WI1130267, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/windsor-water-utility-south-wi1130267 (data as of October 1, 2026).