Public water system · WI1140057

Active

Mayville Waterworks

At a glance

Mayville Waterworks (PWSID WI1140057) is an active community water system in Dodge County, Wisconsin. It reports serving 5,112 people through 1,893 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; 6 are health-based, and the most recent began in November 2017.

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

Population served

5,112

Service connections

1,893

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDWI1140057

System typeCommunity water system

Activity statusActive

Population served5,112

Service connections1,893

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyWI state drinking water program

City servedMayville

StateWisconsin

ZIP—

CountyDodge County

How does Mayville Waterworks compare with other water systems in Dodge County?

By EPA's size categories, Mayville Waterworks is a medium system (3,301 to 10,000 people). Dodge County has 180 active public water systems, and Mayville Waterworks is the 3rd-largest of them by population served. Its population served is about 13 times the county average of 408 people per system, and accounts for 7% of the 73,453 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 Mayville Waterworks is about 24% 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 Mayville Waterworks?

EPA lists Mayville 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. 38 of the 180 active systems in Dodge County (21%) are also owned by a local government.

Does Mayville Waterworks have drinking water violations?

EPA's records list 11 violations for this system; 6 are health-based, and the most recent began in November 2017. The violations listed here began between August 1983 and November 2017. By type: 6 contaminant level above the legal limit, 3 monitoring and reporting, 1 reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Combined Radium (-226 and -228) (4 of them). EPA lists 10 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
2017-11-15	ReportingReporting, Assessment Forms (RTCR) · code 4A	Revised Total Coliform Rulecode 8000	No	Resolved
2012-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2012-07-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2010-08-03	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2010-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
2000-09-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
1996-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
1994-10-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
1983-10-20	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Archived
1983-08-22	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	Resolved
1983-08-22	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Combined Radium (-226 and -228)code 4010	Yes	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.

Mayville Waterworks: frequently asked questions

Who runs Mayville Waterworks?

Mayville Waterworks (PWSID WI1140057) is a community water system owned by a local government. It is regulated by the WI state drinking water program.

How many people does Mayville Waterworks serve?

Mayville Waterworks reports serving 5,112 people through 1,893 service connections in Dodge County, Wisconsin.

Where does Mayville 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 Mayville Waterworks have any drinking water violations?

EPA's records list 11 violations for this system; 6 are health-based, and the most recent began in November 2017. 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 Mayville 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; 6 are health-based, and the most recent began in November 2017. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.

Where can I find Mayville Waterworks' water quality report?

As a community water system, Mayville 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 Dodge County

Water system	County	Population served	Type	Source
Beaver Dam Water Utility	Dodge	16,200	Community	Groundwater
Waupun Utilities	Dodge	8,056	Community	Groundwater
Waupun Correctional Inst	Dodge	3,706	Community	Groundwater
Horicon Waterworks	Dodge	3,682	Community	Groundwater
Lomira Waterworks	Dodge	2,701	Community	Groundwater
Juneau Waterworks	Dodge	2,627	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, “Mayville Waterworks, PWSID WI1140057, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/mayville-waterworks-wi1140057 (data as of October 1, 2026).