Public water system · WI4240218
ActiveMarkesan Waterworks
At a glance
Markesan Waterworks (PWSID WI4240218) is an active community water system in Green Lake County, Wisconsin. It reports serving 1,365 people through 505 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,365
Service connections
505
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Markesan Waterworks compare with other water systems in Green Lake County?
By EPA's size categories, Markesan Waterworks is a small system (501 to 3,300 people). Green Lake County has 70 active public water systems, and Markesan Waterworks is the 2nd-largest of them by population served. Its population served is about 6.5 times the county average of 211 people per system, and accounts for 9.2% of the 14,772 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 Markesan 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 Markesan Waterworks?
EPA lists Markesan 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. 7 of the 70 active systems in Green Lake County (10%) are also owned by a local government.
Does Markesan Waterworks have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for Markesan Waterworks. For the latest compliance status, check EPA ECHO for current compliance history.
Markesan Waterworks: frequently asked questions
Who runs Markesan Waterworks?
Markesan Waterworks (PWSID WI4240218) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Markesan Waterworks serve?
Markesan Waterworks reports serving 1,365 people through 505 service connections in Green Lake County, Wisconsin.
Where does Markesan 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 Markesan Waterworks have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Markesan 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 Safe Drinking Water Act records list no violations for this system. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Markesan Waterworks' water quality report?
As a community water system, Markesan 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 Green Lake County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Berlin Waterworks | Green Lake | 5,524 | Community | Groundwater |
| Princeton Waterworks | Green Lake | 1,166 | Community | Groundwater |
| Green Lake Waterworks | Green Lake | 1,002 | Community | Groundwater |
| Amer Baptist Assem Main | Green Lake | 640 | Non-transient non-community | Groundwater |
| All Saints Catholic Parish | Green Lake | 302 | Non-transient non-community | Groundwater |
| Walkers Bar & Grill | Green Lake | 302 | Transient non-community | Groundwater |
Related pages
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, “Markesan Waterworks, PWSID WI4240218, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/markesan-waterworks-wi4240218 (data as of October 1, 2026).