Public water system · WI6420294
ActiveCashton Waterworks
At a glance
Cashton Waterworks (PWSID WI6420294) is an active community water system in Monroe County, Wisconsin. It reports serving 1,120 people through 528 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 9 violations for this system; 6 are health-based, and the most recent began in July 2004.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,120
Service connections
528
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Cashton Waterworks compare with other water systems in Monroe County?
By EPA's size categories, Cashton Waterworks is a small system (501 to 3,300 people). Monroe County has 102 active public water systems, and Cashton Waterworks is the 4th-largest of them by population served. Its population served is about 191% above the county average of 385 people per system, and accounts for 2.9% of the 39,274 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 Cashton 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 Cashton Waterworks?
EPA lists Cashton 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. 14 of the 102 active systems in Monroe County (14%) are also owned by a local government.
Does Cashton Waterworks have drinking water violations?
EPA's records list 9 violations for this system; 6 are health-based, and the most recent began in July 2004. The violations listed here began between October 1992 and July 2004. By type: 6 contaminant level above the legal limit, 2 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (7 of them). EPA lists 8 as resolved and 1 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2004-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2000-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1999-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1999-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1997-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1997-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Atrazinecode 2050 | No | Resolved |
| 1995-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1993-10-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1992-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
All 9 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.
Cashton Waterworks: frequently asked questions
Who runs Cashton Waterworks?
Cashton Waterworks (PWSID WI6420294) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Cashton Waterworks serve?
Cashton Waterworks reports serving 1,120 people through 528 service connections in Monroe County, Wisconsin.
Where does Cashton 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 Cashton Waterworks have any drinking water violations?
EPA's records list 9 violations for this system; 6 are health-based, and the most recent began in July 2004. 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 Cashton 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 9 violations for this system; 6 are health-based, and the most recent began in July 2004. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Cashton Waterworks' water quality report?
As a community water system, Cashton 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 Monroe County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Sparta Waterworks | Monroe | 10,025 | Community | Groundwater |
| Fort Mccoy North Post | Monroe | 10,000 | Community | Groundwater |
| Tomah Waterworks | Monroe | 9,192 | Community | Groundwater |
| Brookwood High School | Monroe | 700 | Non-transient non-community | Groundwater |
| Norwalk Waterworks | Monroe | 653 | Community | Groundwater |
| Warrens Waterworks | Monroe | 540 | 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, “Cashton Waterworks, PWSID WI6420294, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/cashton-waterworks-wi6420294 (data as of October 1, 2026).