Public water system · WI6180407
ActiveOsseo Cenex
At a glance
Osseo Cenex (PWSID WI6180407) is an active transient non-community water system in Eau Claire County, Wisconsin. It reports serving 25 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 7 violations for this system; 5 are health-based, and the most recent began in November 2010.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
25
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Osseo Cenex compare with other water systems in Eau Claire County?
By EPA's size categories, Osseo Cenex is a very small system (500 people or fewer). Eau Claire County has 111 active public water systems. Its population served is well below the county average of 834 people per system, and accounts for less than 0.1% of the 92,606 people reported by systems filed under the county. Across Wisconsin, the 11,056 active systems average 469 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Osseo Cenex is well below that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. Wisconsin has 9,112 active transient non-community water systems, 82% 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 Osseo Cenex?
EPA lists Osseo Cenex as privately owned. 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. 90 of the 111 active systems in Eau Claire County (81%) are also privately owned.
Does Osseo Cenex have drinking water violations?
EPA's records list 7 violations for this system; 5 are health-based, and the most recent began in November 2010. The violations listed here began between January 1995 and November 2010. By type: 5 contaminant level above the legal limit and 2 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 7 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 |
|---|---|---|---|---|
| 2010-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2009-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitratecode 1040 | Yes | Resolved |
| 2001-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2000-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1998-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitratecode 1040 | Yes | Resolved |
| 1995-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1995-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 7 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.
Osseo Cenex: frequently asked questions
Who runs Osseo Cenex?
Osseo Cenex (PWSID WI6180407) is a transient non-community water system privately owned. It is regulated by the WI state drinking water program.
How many people does Osseo Cenex serve?
Osseo Cenex reports serving 25 people through 1 service connection in Eau Claire County, Wisconsin.
Where does Osseo Cenex 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 Osseo Cenex have any drinking water violations?
EPA's records list 7 violations for this system; 5 are health-based, and the most recent began in November 2010. 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 Osseo Cenex'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 7 violations for this system; 5 are health-based, and the most recent began in November 2010. For current results, consult EPA ECHO, or the WI state drinking water program.
Where can I find Osseo Cenex's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Osseo Cenex is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Eau Claire County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Eau Claire Waterworks | Eau Claire | 70,587 | Community | Groundwater |
| Altoona Waterworks | Eau Claire | 9,627 | Community | Groundwater |
| Augusta Waterworks | Eau Claire | 1,450 | Community | Groundwater |
| Fall Creek Waterworks | Eau Claire | 1,269 | Community | Groundwater |
| Hillcrest Estates MHP | Eau Claire | 850 | Community | Groundwater |
| Menards Old Mill Center | Eau Claire | 730 | Non-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, “Osseo Cenex, PWSID WI6180407, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/osseo-cenex-wi6180407 (data as of October 1, 2026).