Public water system · WI4050456
ActiveAshwaubenon Waterworks
At a glance
Ashwaubenon Waterworks (PWSID WI4050456) is an active community water system in Brown County, Wisconsin. It reports serving 17,730 people through 6,566 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in September 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
17,730
Service connections
6,566
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Ashwaubenon Waterworks compare with other water systems in Brown County?
By EPA's size categories, Ashwaubenon Waterworks is a large system (10,001 to 100,000 people). Brown County has 148 active public water systems, and Ashwaubenon Waterworks is the 4th-largest of them by population served. Its population served is about 11 times the county average of 1,666 people per system, and accounts for 7.2% of the 246,537 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 Ashwaubenon Waterworks is about 165% above 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. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 43 Wisconsin systems (0.4%) list purchased surface water as their primary source.
Who owns and regulates Ashwaubenon Waterworks?
EPA lists Ashwaubenon 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. 41 of the 148 active systems in Brown County (28%) are also owned by a local government.
Does Ashwaubenon Waterworks have drinking water violations?
Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in September 2025. The violations listed here began between January 1996 and September 2025. By type: 11 contaminant level above the legal limit and 1 monitoring. The contaminant or rule involved most often is Combined Radium (-226 and -228) (6 of them). EPA lists 12 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 |
|---|---|---|---|---|
| 2025-09-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2001-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Radium (-226 and -228)code 4010 | Yes | Resolved |
| 2001-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Gross alpha (excluding radon and uranium)code 4000 | Yes | Resolved |
| 2000-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Radium (-226 and -228)code 4010 | Yes | Resolved |
| 2000-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Gross alpha (excluding radon and uranium)code 4000 | Yes | Resolved |
| 1999-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Radium (-226 and -228)code 4010 | Yes | Resolved |
| 1999-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Gross alpha (excluding radon and uranium)code 4000 | Yes | Resolved |
| 1998-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Radium (-226 and -228)code 4010 | Yes | Resolved |
| 1998-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Gross alpha (excluding radon and uranium)code 4000 | Yes | Resolved |
| 1997-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Gross alpha (excluding radon and uranium)code 4000 | Yes | Resolved |
| 1997-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Radium (-226 and -228)code 4010 | Yes | Resolved |
| 1996-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Radium (-226 and -228)code 4010 | Yes | Resolved |
The 12 most recent 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.
Ashwaubenon Waterworks: frequently asked questions
Who runs Ashwaubenon Waterworks?
Ashwaubenon Waterworks (PWSID WI4050456) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Ashwaubenon Waterworks serve?
Ashwaubenon Waterworks reports serving 17,730 people through 6,566 service connections in Brown County, Wisconsin.
Where does Ashwaubenon Waterworks get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Ashwaubenon Waterworks have any drinking water violations?
Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in September 2025. 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 Ashwaubenon 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. Of the 12 most recent violations in EPA's records, 11 are health-based, and the most recent began in September 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Ashwaubenon Waterworks' water quality report?
As a community water system, Ashwaubenon 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 Brown County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Green Bay Waterworks | Brown | 107,369 | Community | Surface water |
| De Pere Waterworks Sa 1 | Brown | 25,660 | Community | Purchased surface water |
| Howard Waterworks | Brown | 21,133 | Community | Purchased surface water |
| Bellevue Waterworks | Brown | 16,715 | Community | Purchased surface water |
| Allouez Waterworks | Brown | 13,923 | Community | Purchased surface water |
| Ledgeview Tn Sanitary Dist 2 | Brown | 7,602 | Community | Purchased surface water |
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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, “Ashwaubenon Waterworks, PWSID WI4050456, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/ashwaubenon-waterworks-wi4050456 (data as of October 1, 2026).