Public water system · WI2650062

Active

Elkhorn Waterworks

At a glance

Elkhorn Waterworks (PWSID WI2650062) is an active community water system in Walworth County, Wisconsin. It reports serving 10,317 people through 3,821 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in November 2021.

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

Population served

10,317

Service connections

3,821

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDWI2650062

System typeCommunity water system

Activity statusActive

Population served10,317

Service connections3,821

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyWI state drinking water program

City servedElkhorn

StateWisconsin

ZIP—

CountyWalworth County

How does Elkhorn Waterworks compare with other water systems in Walworth County?

By EPA's size categories, Elkhorn Waterworks is a large system (10,001 to 100,000 people). Walworth County has 252 active public water systems, and Elkhorn Waterworks is the 2nd-largest of them by population served. Its population served is about 27 times the county average of 380 people per system, and accounts for 11% of the 95,693 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 Elkhorn Waterworks is about 54% 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. 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 Elkhorn Waterworks?

EPA lists Elkhorn 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. 29 of the 252 active systems in Walworth County (12%) are also owned by a local government.

Does Elkhorn Waterworks have drinking water violations?

Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in November 2021. The violations listed here began between January 2015 and November 2021. By type: 6 contaminant level above the legal limit, 3 public notice, recordkeeping or other, 2 monitoring and reporting and 1 required treatment not met. The contaminant or rule involved most often is Combined Radium (-226 and -228) (5 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
2021-11-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2021-10-28	Monitoring and reportingMonitoring, Source Water (GWR) · code 34	E. colicode 3014	No	Resolved
2021-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2020-11-01	Required treatment not metLead Service Line Replacement (LSLR) · code 64	Lead and Copper Rulecode 5000	Yes	Resolved
2020-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2019-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2019-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2018-11-07	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2018-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2015-04-29	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2015-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2015-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	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.

Elkhorn Waterworks: frequently asked questions

Who runs Elkhorn Waterworks?

Elkhorn Waterworks (PWSID WI2650062) is a community water system owned by a local government. It is regulated by the WI state drinking water program.

How many people does Elkhorn Waterworks serve?

Elkhorn Waterworks reports serving 10,317 people through 3,821 service connections in Walworth County, Wisconsin.

Where does Elkhorn 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 Elkhorn Waterworks have any drinking water violations?

Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in November 2021. 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 Elkhorn 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, 7 are health-based, and the most recent began in November 2021. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.

Where can I find Elkhorn Waterworks' water quality report?

As a community water system, Elkhorn 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 Walworth County

Water system	County	Population served	Type	Source
Whitewater Waterworks	Walworth	14,000	Community	Groundwater
Delavan Waterworks	Walworth	9,028	Community	Groundwater
Lake Geneva Utility Commission	Walworth	7,107	Community	Groundwater
East Troy Waterworks	Walworth	5,054	Community	Groundwater
Bloomfield, Village of	Walworth	4,071	Community	Groundwater
Lake Como Sanitary Dist 1	Walworth	3,038	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, “Elkhorn Waterworks, PWSID WI2650062, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/elkhorn-waterworks-wi2650062 (data as of October 1, 2026).