Public water system · WI6100327

Active

Granton Waterworks

At a glance

Granton Waterworks (PWSID WI6100327) is an active community water system in Clark County, Wisconsin. It reports serving 349 people through 189 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, 2 are health-based, and the most recent began in January 2025.

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

Population served

349

Service connections

189

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDWI6100327

System typeCommunity water system

Activity statusActive

Population served349

Service connections189

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyWI state drinking water program

City servedGranton

StateWisconsin

ZIP—

CountyClark County

How does Granton Waterworks compare with other water systems in Clark County?

By EPA's size categories, Granton Waterworks is a very small system (500 people or fewer). Clark County has 94 active public water systems. Its population served is about 134% above the county average of 149 people per system, and accounts for 2.5% of the 14,002 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 Granton 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 Granton Waterworks?

EPA lists Granton 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. 32 of the 94 active systems in Clark County (34%) are also owned by a local government.

Does Granton Waterworks have drinking water violations?

Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in January 2025. The violations listed here began between January 2011 and January 2025. By type: 9 monitoring and reporting, 2 contaminant level above the legal limit and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Haloacetic acids (HAA5) (3 of them). EPA lists 11 as resolved and 1 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.

Began	Violation	Contaminant or rule	Health-based	Status
2025-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Ethylene dibromide (EDB)code 2946	Yes	Archived
2020-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2020-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2017-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2017-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2016-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2016-01-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2014-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Ethylene dibromide (EDB)code 2946	Yes	Resolved
2014-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2011-03-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2011-02-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2011-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	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.

Granton Waterworks: frequently asked questions

Who runs Granton Waterworks?

Granton Waterworks (PWSID WI6100327) is a community water system owned by a local government. It is regulated by the WI state drinking water program.

How many people does Granton Waterworks serve?

Granton Waterworks reports serving 349 people through 189 service connections in Clark County, Wisconsin.

Where does Granton 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 Granton Waterworks have any drinking water violations?

Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in January 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 Granton 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, 2 are health-based, and the most recent began in January 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 Granton Waterworks' water quality report?

As a community water system, Granton 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 Clark County

Water system	County	Population served	Type	Source
Neillsville Waterworks	Clark	2,384	Community	Groundwater
Thorp Waterworks	Clark	1,636	Community	Groundwater
Loyal Waterworks	Clark	1,308	Community	Groundwater
Greenwood Waterworks	Clark	1,079	Community	Groundwater
Owen Waterworks	Clark	936	Community	Groundwater
Dorchester Waterworks	Clark	834	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, “Granton Waterworks, PWSID WI6100327, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/granton-waterworks-wi6100327 (data as of October 1, 2026).