Public water system · IA6171029
ActiveWinterset Municipal Waterworks
At a glance
Winterset Municipal Waterworks (PWSID IA6171029) is an active community water system in Madison County, Iowa. It reports serving 5,428 people through 2,600 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in October 2018.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
5,428
Service connections
2,600
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Winterset Municipal Waterworks compare with other water systems in Madison County?
By EPA's size categories, Winterset Municipal Waterworks is a medium system (3,301 to 10,000 people). Madison County has 4 active public water systems, and Winterset Municipal Waterworks is the 2nd-largest of them by population served. Its population served is about 23% below the county average of 7,048 people per system, and accounts for 19% of the 28,192 people reported by systems filed under the county. Across Iowa, the 1,828 active systems average 1,718 people each. Nationally, the average active community water system reports serving 6,703 people, so Winterset Municipal Waterworks is about 19% 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. Iowa has 1,084 active community water systems, 59% of the state's 1,828 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 24 Iowa systems (1.3%) list surface water as their primary source.
Who owns and regulates Winterset Municipal Waterworks?
EPA lists Winterset Municipal Waterworks as owned by a local government. The IA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 3 of the 4 active systems in Madison County (75%) are also owned by a local government.
Does Winterset Municipal Waterworks have drinking water violations?
Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in October 2018. The violations listed here began between April 2004 and October 2018. By type: 10 contaminant level above the legal limit, 1 required treatment not met and 1 monitoring and reporting. The contaminant or rule involved most often is Nitrate (6 of them). EPA lists 11 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 |
|---|---|---|---|---|
| 2018-10-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2007-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 2007-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2006-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2006-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2005-12-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 2005-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 2005-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 2004-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2004-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 2004-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 2004-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | 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.
Winterset Municipal Waterworks: frequently asked questions
Who runs Winterset Municipal Waterworks?
Winterset Municipal Waterworks (PWSID IA6171029) is a community water system owned by a local government. It is regulated by the IA state drinking water program.
How many people does Winterset Municipal Waterworks serve?
Winterset Municipal Waterworks reports serving 5,428 people through 2,600 service connections in Madison County, Iowa.
Where does Winterset Municipal Waterworks get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Winterset Municipal Waterworks have any drinking water violations?
Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in October 2018. 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 Winterset Municipal Waterworks' 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, 11 are health-based, and the most recent began in October 2018. For current results, consult the system's annual water quality report, EPA ECHO, or the IA state drinking water program.
Where can I find Winterset Municipal Waterworks' water quality report?
As a community water system, Winterset Municipal Waterworks 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 Madison County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Sirwa #2 (Creston) | Madison + 7 more | 20,793 | Community | Surface water |
| Earlham Municipal Waterworks | Madison | 1,446 | Community | Purchased surface water |
| Truro Waterworks | Madison | 525 | 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, “Winterset Municipal Waterworks, PWSID IA6171029, Iowa”, https://aquacensus.com/water-systems/iowa/winterset-municipal-waterworks-ia6171029 (data as of October 1, 2026).