Public water system · WI6170261
ActiveColfax Waterworks
At a glance
Colfax Waterworks (PWSID WI6170261) is an active community water system in Dunn County, Wisconsin. It reports serving 1,102 people through 422 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in November 2019.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,102
Service connections
422
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Colfax Waterworks compare with other water systems in Dunn County?
By EPA's size categories, Colfax Waterworks is a small system (501 to 3,300 people). Dunn County has 86 active public water systems, and Colfax Waterworks is the 2nd-largest of them by population served. Its population served is about 3.6 times the county average of 305 people per system, and accounts for 4.2% 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 Colfax Waterworks 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 Colfax Waterworks?
EPA lists Colfax Waterworks 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 Colfax Waterworks have drinking water violations?
EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in November 2019. The violations listed here began between December 2011 and November 2019. By type: 1 monitoring and 1 contaminant level above the legal limit. The contaminants or rules involved are Revised Total Coliform Rule and Total coliform bacteria (TCR). EPA lists 2 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 |
|---|---|---|---|---|
| 2019-11-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2011-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 2 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.
Colfax Waterworks: frequently asked questions
Who runs Colfax Waterworks?
Colfax Waterworks (PWSID WI6170261) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Colfax Waterworks serve?
Colfax Waterworks reports serving 1,102 people through 422 service connections in Dunn County, Wisconsin.
Where does Colfax Waterworks 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 Colfax Waterworks have any drinking water violations?
EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in November 2019. 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 Colfax 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. EPA's records list 2 violations for this system; 1 is health-based, and the most recent began in November 2019. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Colfax Waterworks' water quality report?
As a community water system, Colfax 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 Dunn County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Menomonie Waterworks | Dunn | 15,950 | 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 |
| Synergy Cooperative - Ridgeland | Dunn | 475 | Transient non-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, “Colfax Waterworks, PWSID WI6170261, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/colfax-waterworks-wi6170261 (data as of October 1, 2026).