Public water system · WI7370102
ActiveWausau Waterworks
At a glance
Wausau Waterworks (PWSID WI7370102) is an active community water system in Marathon County, Wisconsin. It reports serving 39,994 people through 15,643 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in September 2000.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
39,994
Service connections
15,643
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Wausau Waterworks compare with other water systems in Marathon County?
By EPA's size categories, Wausau Waterworks is a large system (10,001 to 100,000 people). Marathon County has 196 active public water systems, and Wausau Waterworks is the largest of them by population served. Its population served is about 76 times the county average of 528 people per system, and accounts for 39% of the 103,490 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 Wausau Waterworks is about 6 times 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 Wausau Waterworks?
EPA lists Wausau 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. 43 of the 196 active systems in Marathon County (22%) are also owned by a local government.
Does Wausau Waterworks have drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in September 2000. The violations listed here began between July 1992 and September 2000. By type: 3 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 4 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 |
|---|---|---|---|---|
| 2000-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1994-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1992-08-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1992-07-01 | Monitoring and reportingWater Quality Parameter M/R · code 53 | Lead and Copper Rulecode 5000 | No | Resolved |
All 4 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.
Wausau Waterworks: frequently asked questions
Who runs Wausau Waterworks?
Wausau Waterworks (PWSID WI7370102) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Wausau Waterworks serve?
Wausau Waterworks reports serving 39,994 people through 15,643 service connections in Marathon County, Wisconsin.
Where does Wausau 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 Wausau Waterworks have any drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in September 2000. 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 Wausau 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 4 violations for this system; 1 is health-based, and the most recent began in September 2000. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Wausau Waterworks' water quality report?
As a community water system, Wausau 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 Marathon County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Weston Municipal Utilities | Marathon | 16,000 | Community | Groundwater |
| Kronenwetter Water & Sewer Utility | Marathon | 6,931 | Community | Groundwater |
| Rib Mountain Water Utility | Marathon | 6,398 | Community | Groundwater |
| Mosinee Waterworks | Marathon | 3,406 | Community | Groundwater |
| Rothschild Waterworks | Marathon | 3,190 | Community | Groundwater |
| Abbotsford Waterworks | Marathon | 2,502 | 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, “Wausau Waterworks, PWSID WI7370102, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/wausau-waterworks-wi7370102 (data as of October 1, 2026).