Public water system · WI4430490

Active

Gillett Waterworks

At a glance

Gillett Waterworks (PWSID WI4430490) is an active community water system in Oconto County, Wisconsin. It reports serving 1,264 people through 673 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; none is health-based, and the most recent began in April 2009.

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

Population served

1,264

Service connections

673

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDWI4430490

System typeCommunity water system

Activity statusActive

Population served1,264

Service connections673

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyWI state drinking water program

City servedGillett

StateWisconsin

ZIP—

CountyOconto County

How does Gillett Waterworks compare with other water systems in Oconto County?

By EPA's size categories, Gillett Waterworks is a small system (501 to 3,300 people). Oconto County has 202 active public water systems, and Gillett Waterworks is the 3rd-largest of them by population served. Its population served is about 13 times the county average of 101 people per system, and accounts for 6.2% of the 20,322 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 Gillett 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 Gillett Waterworks?

EPA lists Gillett 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. 19 of the 202 active systems in Oconto County (9.4%) are also owned by a local government.

Does Gillett Waterworks have drinking water violations?

EPA's records list 11 violations for this system; none is health-based, and the most recent began in April 2009. The violations listed here began between December 1992 and April 2009. By type: 10 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 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
2009-04-01	Monitoring and reportingMonitoring, Regular · code 03	Combined Radium (-226 and -228)code 4010	No	Resolved
2009-04-01	Monitoring and reportingMonitoring, Regular · code 03	Radium-228code 4030	No	Resolved
2009-04-01	Monitoring and reportingMonitoring, Regular · code 03	Gross alpha (excluding radon and uranium)code 4000	No	Resolved
2008-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2008-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2004-12-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2004-03-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2004-02-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2004-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
1999-02-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
1992-12-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	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.

Gillett Waterworks: frequently asked questions

Who runs Gillett Waterworks?

Gillett Waterworks (PWSID WI4430490) is a community water system owned by a local government. It is regulated by the WI state drinking water program.

How many people does Gillett Waterworks serve?

Gillett Waterworks reports serving 1,264 people through 673 service connections in Oconto County, Wisconsin.

Where does Gillett 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 Gillett Waterworks have any drinking water violations?

EPA's records list 11 violations for this system; none is health-based, and the most recent began in April 2009. 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 Gillett 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; none is health-based, and the most recent began in April 2009. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.

Where can I find Gillett Waterworks' water quality report?

As a community water system, Gillett 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 Oconto County

Water system	County	Population served	Type	Source
Oconto Waterworks	Oconto	4,583	Community	Groundwater
Oconto Falls Waterworks	Oconto	2,892	Community	Groundwater
Lena Waterworks	Oconto	585	Community	Groundwater
Sunnyside Elementary Sch	Oconto	575	Non-transient non-community	Groundwater
Suring Waterworks	Oconto	517	Community	Groundwater
Abrams Elementary School	Oconto	400	Non-transient non-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, “Gillett Waterworks, PWSID WI4430490, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/gillett-waterworks-wi4430490 (data as of October 1, 2026).