Public water system · WI6170263
ActiveDownsville Sanitary District
At a glance
Downsville Sanitary District (PWSID WI6170263) is an active community water system in Dunn County, Wisconsin. It reports serving 250 people through 93 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 10 violations for this system; 5 are health-based, and the most recent began in January 2024.
This page covers its drinking water system only; sewer and wastewater service are not part of EPA's drinking water records.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
250
Service connections
93
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Downsville Sanitary District compare with other water systems in Dunn County?
By EPA's size categories, Downsville Sanitary District is a very small system (500 people or fewer). Dunn County has 86 active public water systems. Its population served is about 18% below the county average of 305 people per system, and accounts for 1% of the 26,187 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 Downsville Sanitary District 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. 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 Downsville Sanitary District?
EPA lists Downsville Sanitary District 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. 15 of the 86 active systems in Dunn County (17%) are also owned by a local government.
Does Downsville Sanitary District have drinking water violations?
EPA's records list 10 violations for this system; 5 are health-based, and the most recent began in January 2024. The violations listed here began between January 1984 and January 2024. By type: 5 contaminant level above the legal limit, 4 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (5 of them). EPA lists 5 as resolved and 5 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 |
|---|---|---|---|---|
| 2024-01-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2004-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2000-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1998-10-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1997-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1995-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1992-03-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1991-05-02 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1984-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Radium (-226 and -228)code 4010 | Yes | Archived |
| 1984-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Radium (-226 and -228)code 4010 | Yes | Archived |
All 10 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.
Downsville Sanitary District: frequently asked questions
Who runs Downsville Sanitary District?
Downsville Sanitary District (PWSID WI6170263) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Downsville Sanitary District serve?
Downsville Sanitary District reports serving 250 people through 93 service connections in Dunn County, Wisconsin.
Where does Downsville Sanitary District 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 Downsville Sanitary District have any drinking water violations?
EPA's records list 10 violations for this system; 5 are health-based, and the most recent began in January 2024. 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 Downsville Sanitary District'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 10 violations for this system; 5 are health-based, and the most recent began in January 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Downsville Sanitary District's water quality report?
As a community water system, Downsville Sanitary District 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 Dunn County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Menomonie Waterworks | Dunn | 15,950 | Community | Groundwater |
| Colfax Waterworks | Dunn | 1,102 | Community | Groundwater |
| Boyceville Waterworks | Dunn | 1,043 | Community | Groundwater |
| Elk Mound Waterworks | Dunn | 895 | Community | Groundwater |
| Birch Terrace Mobile Home Community | Dunn | 700 | Community | Groundwater |
| Knapp Waterworks | Dunn | 486 | 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, “Downsville Sanitary District, PWSID WI6170263, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/downsville-sanitary-district-wi6170263 (data as of October 1, 2026).