Public water system · WI1220102

Active

Hazel Green Waterworks

At a glance

Hazel Green Waterworks (PWSID WI1220102) is an active community water system in Grant County, Wisconsin. It reports serving 1,193 people through 525 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, 3 are health-based, and the most recent began in October 2025.

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

Population served

1,193

Service connections

525

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDWI1220102

System typeCommunity water system

Activity statusActive

Population served1,193

Service connections525

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyWI state drinking water program

City servedHazel Green

StateWisconsin

ZIP—

CountyGrant County

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

By EPA's size categories, Hazel Green Waterworks is a small system (501 to 3,300 people). Grant County has 90 active public water systems. Its population served is about 158% above the county average of 463 people per system, and accounts for 2.9% 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 Hazel Green 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 Hazel Green Waterworks?

EPA lists Hazel Green 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 Hazel Green Waterworks have drinking water violations?

Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in October 2025. The violations listed here began between November 2000 and October 2025. By type: 6 monitoring and reporting, 3 required treatment not met, 2 monitoring and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Lead and Copper Rule (3 of them). EPA lists 11 as resolved and 1 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
2025-10-02	Required treatment not metTreatment Technique No Certif. Operator · code 12	Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400	Yes	Resolved
2023-10-01	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2022-12-29	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Unaddressed
2022-12-29	Required treatment not metOCCT/SOWT Study/Recommendation · code 57	Lead and Copper Rulecode 5000	Yes	Resolved
2019-09-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2019-01-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2014-05-02	Required treatment not metTreatment Technique No Certif. Operator · code 12	Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400	Yes	Resolved
2012-01-01	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2008-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2008-10-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2002-03-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2000-11-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	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.

Hazel Green Waterworks: frequently asked questions

Who runs Hazel Green Waterworks?

Hazel Green Waterworks (PWSID WI1220102) is a community water system owned by a local government. It is regulated by the WI state drinking water program.

How many people does Hazel Green Waterworks serve?

Hazel Green Waterworks reports serving 1,193 people through 525 service connections in Grant County, Wisconsin.

Where does Hazel Green 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 Hazel Green Waterworks have any drinking water violations?

Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in October 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 Hazel Green 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, 3 are health-based, and the most recent began in October 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 Hazel Green Waterworks' water quality report?

As a community water system, Hazel Green 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
Lancaster Waterworks	Grant	3,907	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

Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.

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, “Hazel Green Waterworks, PWSID WI1220102, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/hazel-green-waterworks-wi1220102 (data as of October 1, 2026).