Public water system · WI1220107

Active

Lancaster Waterworks

At a glance

Lancaster Waterworks (PWSID WI1220107) is an active community water system in Grant County, Wisconsin. It reports serving 3,907 people through 1,447 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 11 violations for this system; 3 are health-based, and the most recent began in March 2022.

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

Population served

3,907

Service connections

1,447

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDWI1220107

System typeCommunity water system

Activity statusActive

Population served3,907

Service connections1,447

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyWI state drinking water program

City servedLancaster

StateWisconsin

ZIP—

CountyGrant County

How does Lancaster Waterworks compare with other water systems in Grant County?

By EPA's size categories, Lancaster Waterworks is a medium system (3,301 to 10,000 people). Grant County has 90 active public water systems, and Lancaster Waterworks is the 2nd-largest of them by population served. Its population served is about 8.4 times the county average of 463 people per system, and accounts for 9.4% 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 Lancaster Waterworks is about 42% 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 Lancaster Waterworks?

EPA lists Lancaster 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 Lancaster Waterworks have drinking water violations?

EPA's records list 11 violations for this system; 3 are health-based, and the most recent began in March 2022. The violations listed here began between January 1993 and March 2022. By type: 5 monitoring and reporting, 3 contaminant level above the legal limit, 2 public notice, recordkeeping or other and 1 monitoring. The contaminant or rule involved most often is Lead and Copper Rule (2 of them). EPA lists 11 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
2022-03-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2017-06-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2015-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2015-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2013-09-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2013-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2012-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2012-05-22	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2012-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
1997-05-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
1993-01-01	Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51	Lead and Copper Rulecode 5000	No	Resolved

All 11 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.

Lancaster Waterworks: frequently asked questions

Who runs Lancaster Waterworks?

Lancaster Waterworks (PWSID WI1220107) is a community water system owned by a local government. It is regulated by the WI state drinking water program.

How many people does Lancaster Waterworks serve?

Lancaster Waterworks reports serving 3,907 people through 1,447 service connections in Grant County, Wisconsin.

Where does Lancaster 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 Lancaster Waterworks have any drinking water violations?

EPA's records list 11 violations for this system; 3 are health-based, and the most recent began in March 2022. 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 Lancaster 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 11 violations for this system; 3 are health-based, and the most recent began in March 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.

Where can I find Lancaster Waterworks' water quality report?

As a community water system, Lancaster 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
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
Hazel Green Waterworks	Grant	1,193	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, “Lancaster Waterworks, PWSID WI1220107, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/lancaster-waterworks-wi1220107 (data as of October 1, 2026).