Public water system · IL1730550
ActiveWindsor
At a glance
Windsor (PWSID IL1730550) is an active community water system in Shelby County, Illinois. It reports serving 1,200 people through 550 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in February 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,200
Service connections
550
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Windsor compare with other water systems in Shelby County?
By EPA's size categories, Windsor is a small system (501 to 3,300 people). Shelby County has 12 active public water systems, and Windsor is the 3rd-largest of them by population served. Its population served is about 20% above the county average of 1,004 people per system, and accounts for 10% of the 12,045 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 Windsor 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 Windsor?
EPA lists Windsor 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 12 active systems in Shelby County (75%) are also owned by a local government.
Does Windsor have drinking water violations?
Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in February 2023. The violations listed here began between November 1987 and February 2023. By type: 5 monitoring and reporting, 3 public notice, recordkeeping or other, 3 required treatment not met and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Lead and Copper Rule (3 of them). EPA lists 8 as resolved and 4 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 |
|---|---|---|---|---|
| 2023-02-17 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2022-01-25 | Required treatment not metOCCT/SOWT Study/Recommendation · code 57 | Lead and Copper Rulecode 5000 | Yes | Resolved |
| 2021-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2012-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1995-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1995-02-01 | Required treatment not metOCCT/SOWT Study/Recommendation · code 57 | Lead and Copper Rulecode 5000 | Yes | Resolved |
| 1994-07-11 | Required treatment not metOCCT/SOWT Study/Recommendation · code 57 | Lead and Copper Rulecode 5000 | Yes | Resolved |
| 1993-09-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1987-11-23 | Monitoring and reportingMonitoring, Check/Repeat/Confirmation · code 04 | Fluoridecode 1025 | No | Archived |
| 1987-11-23 | Monitoring and reportingMonitoring, Check/Repeat/Confirmation · code 04 | Cadmiumcode 1015 | No | 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.
Windsor: frequently asked questions
Who runs Windsor?
Windsor (PWSID IL1730550) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does Windsor serve?
Windsor reports serving 1,200 people through 550 service connections in Shelby County, Illinois.
Where does Windsor 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 Windsor have any drinking water violations?
Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in February 2023. 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'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, 4 are health-based, and the most recent began in February 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find Windsor's water quality report?
As a community water system, Windsor 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 Shelby County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Shelbyville | Shelby | 5,600 | Community | Groundwater |
| Moweaqua | Shelby | 1,785 | Community | Groundwater |
| Findlay | Shelby | 750 | Community | Purchased surface water |
| Stewardson | Shelby | 734 | Community | Groundwater |
| Cowden | Shelby | 612 | Community | Groundwater |
| Tower Hill | Shelby | 500 | 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, “Windsor, PWSID IL1730550, Illinois”, https://aquacensus.com/water-systems/illinois/windsor-il1730550 (data as of October 1, 2026).