Public water system · WI2680238

Active

Waukesha Water Utility

At a glance

Waukesha Water Utility (PWSID WI2680238) is an active community water system in Waukesha County, Wisconsin. It reports serving 70,718 people through 26,192 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, 8 are health-based, and the most recent began in October 2023.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

70,718

Service connections

26,192

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSIDWI2680238

System typeCommunity water system

Activity statusActive

Population served70,718

Service connections26,192

Primary water sourcePurchased surface water

Owner typeLocal government

Primacy agencyWI state drinking water program

City servedWaukesha

StateWisconsin

ZIP—

CountyWaukesha County

How does Waukesha Water Utility compare with other water systems in Waukesha County?

By EPA's size categories, Waukesha Water Utility is a large system (10,001 to 100,000 people). Waukesha County has 589 active public water systems, and Waukesha Water Utility is the largest of them by population served. Its population served is about 129 times the county average of 549 people per system, and accounts for 22% of the 323,265 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 Waukesha Water Utility is about 11 times 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 Waukesha Water Utility?

EPA lists Waukesha Water Utility 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. 102 of the 589 active systems in Waukesha County (17%) are also owned by a local government.

Does Waukesha Water Utility have drinking water violations?

Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in October 2023. The violations listed here began between March 2023 and October 2023. By type: 8 contaminant level above the legal limit and 4 public notice, recordkeeping or other. The contaminant or rule involved most often is Combined Radium (-226 and -228) (7 of them). EPA lists 10 as resolved and 2 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
2023-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2023-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2023-09-29	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Unaddressed
2023-09-29	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Unaddressed
2023-09-20	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2023-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2023-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2023-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2023-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2023-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Gross alpha (excluding radon and uranium)code 4000	Yes	Resolved
2023-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2023-03-06	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	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.

Waukesha Water Utility: frequently asked questions

Who runs Waukesha Water Utility?

Waukesha Water Utility (PWSID WI2680238) is a community water system owned by a local government. It is regulated by the WI state drinking water program.

How many people does Waukesha Water Utility serve?

Waukesha Water Utility reports serving 70,718 people through 26,192 service connections in Waukesha County, Wisconsin.

Where does Waukesha Water Utility 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 Waukesha Water Utility have any drinking water violations?

Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in October 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 Waukesha Water Utility'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. Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in October 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 Waukesha Water Utility's water quality report?

As a community water system, Waukesha Water Utility 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 Waukesha County

Water system	County	Population served	Type	Source
Brookfield Water Utility	Waukesha	29,070	Community	Groundwater
New Berlin Water Utility	Waukesha	27,899	Community	Purchased surface water
Menomonee Falls Ww - Surface Water	Waukesha	23,867	Community	Purchased surface water
Oconomowoc Waterworks	Waukesha	15,805	Community	Groundwater
Sussex Village Hall & Water Utility	Waukesha	11,750	Community	Groundwater
Hartland Waterworks	Waukesha	9,212	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, “Waukesha Water Utility, PWSID WI2680238, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/waukesha-water-utility-wi2680238 (data as of October 1, 2026).