Public water system · WI1220091
ActiveCassville Waterworks
At a glance
Cassville Waterworks (PWSID WI1220091) is an active community water system in Grant County, Wisconsin. It reports serving 777 people through 502 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; 1 is health-based, and the most recent began in June 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
777
Service connections
502
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Cassville Waterworks compare with other water systems in Grant County?
By EPA's size categories, Cassville Waterworks is a small system (501 to 3,300 people). Grant County has 90 active public water systems. Its population served is about 68% above the county average of 463 people per system, and accounts for 1.9% of the 41,674 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 Cassville 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 Cassville Waterworks?
EPA lists Cassville 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. 21 of the 90 active systems in Grant County (23%) are also owned by a local government.
Does Cassville Waterworks have drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in June 2023. The violations listed here began between January 2012 and June 2023. By type: 2 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Lead and Copper Rule (2 of them). EPA lists 2 as resolved and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2023-06-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2019-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, E. coli (RTCR) · code 1A | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2012-01-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Unaddressed |
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.
Cassville Waterworks: frequently asked questions
Who runs Cassville Waterworks?
Cassville Waterworks (PWSID WI1220091) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Cassville Waterworks serve?
Cassville Waterworks reports serving 777 people through 502 service connections in Grant County, Wisconsin.
Where does Cassville 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 Cassville Waterworks have any drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in June 2023. 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 Cassville 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 3 violations for this system; 1 is health-based, and the most recent began in June 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Cassville Waterworks' water quality report?
As a community water system, Cassville 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 Grant County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Platteville Waterworks | Grant | 12,268 | Community | Groundwater |
| Lancaster Waterworks | Grant | 3,907 | Community | Groundwater |
| Boscobel Waterworks | Grant | 3,237 | Community | Groundwater |
| Fennimore Waterworks | Grant | 2,507 | Community | Groundwater |
| Cuba City Waterworks | Grant | 2,141 | Community | Groundwater |
| Muscoda Waterworks | Grant | 1,453 | Community | Groundwater |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Cassville Waterworks, PWSID WI1220091, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/cassville-waterworks-wi1220091 (data as of October 1, 2026).