Public water system · WI4200474
ActiveMount Calvary Waterworks
At a glance
Mount Calvary Waterworks (PWSID WI4200474) is an active community water system in Fond du Lac County, Wisconsin. It reports serving 478 people through 177 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list one violation for this system; it is not health-based, and the most recent began in June 2002.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
478
Service connections
177
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Mount Calvary Waterworks compare with other water systems in Fond du Lac County?
By EPA's size categories, Mount Calvary Waterworks is a very small system (500 people or fewer). Fond du Lac County has 207 active public water systems. Its population served is about 14% above the county average of 421 people per system, and accounts for 0.5% of the 87,145 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 Mount Calvary 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 Mount Calvary Waterworks?
EPA lists Mount Calvary 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. 26 of the 207 active systems in Fond du Lac County (13%) are also owned by a local government.
Does Mount Calvary Waterworks have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in June 2002. By type: 1 monitoring and reporting. The contaminant or rule involved is Total coliform bacteria (TCR). EPA lists 1 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 |
|---|---|---|---|---|
| 2002-06-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
The one violation in EPA's records.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.
Mount Calvary Waterworks: frequently asked questions
Who runs Mount Calvary Waterworks?
Mount Calvary Waterworks (PWSID WI4200474) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Mount Calvary Waterworks serve?
Mount Calvary Waterworks reports serving 478 people through 177 service connections in Fond du Lac County, Wisconsin.
Where does Mount Calvary 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 Mount Calvary Waterworks have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in June 2002. 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 Mount Calvary 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 one violation for this system; it is not health-based, and the most recent began in June 2002. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Mount Calvary Waterworks' water quality report?
As a community water system, Mount Calvary 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 Fond du Lac County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Fond Du Lac Waterworks | Fond du Lac | 44,678 | Community | Groundwater |
| Ripon Water Utility | Fond du Lac | 7,716 | Community | Groundwater |
| North Fond Du Lac Waterworks | Fond du Lac | 5,414 | Community | Groundwater |
| Campbellsport Waterworks | Fond du Lac | 1,825 | Community | Groundwater |
| Oakfield Waterworks | Fond du Lac | 1,058 | Community | Groundwater |
| Ashwood Grove Edgewater | Fond du Lac | 1,046 | 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, “Mount Calvary Waterworks, PWSID WI4200474, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/mount-calvary-waterworks-wi4200474 (data as of October 1, 2026).