Public water system · WI7370660
ActiveRib Mountain Water Utility
At a glance
Rib Mountain Water Utility (PWSID WI7370660) is an active community water system in Marathon County, Wisconsin. It reports serving 6,398 people through 2,416 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 3 violations for this system; none is health-based, and the most recent began in January 2018.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
6,398
Service connections
2,416
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Rib Mountain Water Utility compare with other water systems in Marathon County?
By EPA's size categories, Rib Mountain Water Utility is a medium system (3,301 to 10,000 people). Marathon County has 196 active public water systems, and Rib Mountain Water Utility is the 4th-largest of them by population served. Its population served is about 12 times the county average of 528 people per system, and accounts for 6.2% 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 Rib Mountain Water Utility is roughly in line with 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 Rib Mountain Water Utility?
EPA lists Rib Mountain Water Utility 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 Rib Mountain Water Utility have drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in January 2018. The violations listed here began between July 2000 and January 2018. By type: 2 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminants or rules involved are Total trihalomethanes (TTHM), Haloacetic acids (HAA5) and Consumer Confidence Rule. EPA lists 3 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 |
|---|---|---|---|---|
| 2018-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2018-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2000-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
All 3 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.
Rib Mountain Water Utility: frequently asked questions
Who runs Rib Mountain Water Utility?
Rib Mountain Water Utility (PWSID WI7370660) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Rib Mountain Water Utility serve?
Rib Mountain Water Utility reports serving 6,398 people through 2,416 service connections in Marathon County, Wisconsin.
Where does Rib Mountain Water Utility 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 Rib Mountain Water Utility have any drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in January 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 Rib Mountain Water Utility'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 3 violations for this system; none is health-based, and the most recent began in January 2018. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Rib Mountain Water Utility's water quality report?
As a community water system, Rib Mountain Water Utility 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 |
|---|---|---|---|---|
| Wausau Waterworks | Marathon | 39,994 | Community | Groundwater |
| Weston Municipal Utilities | Marathon | 16,000 | Community | Groundwater |
| Kronenwetter Water & Sewer Utility | Marathon | 6,931 | 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, “Rib Mountain Water Utility, PWSID WI7370660, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/rib-mountain-water-utility-wi7370660 (data as of October 1, 2026).