County · Wisconsin
Monroe County, Wisconsin: drinking water records
This overview covers 7 ZIP codes and 11 community water systems in Monroe County. It also stands in for 0 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Tomah Waterworks WI6420254 | 9,192 | 300 | 3 | 8 | 0 ppb |
| Sparta Waterworks WI6420297 | 10,025 | 300 | 0 | 0 | 1.4 ppb |
| Fort Mccoy North Post WI6420302 | 10,000 | 360 | 0 | 0 | 8 ppb |
| Wilton Waterworks WI6420306 | 490 | 0 | 0 | 2 | 0 ppb |
| Kendall Waterworks WI6420295 | 458 | 0 | 0 | 3 | 2.4 ppb |
| Oakdale Waterworks WI6420069 | 317 | 0 | 0 | 1 | 0 ppb |
| Cashton Waterworks WI6420294 | 1,120 | 0 | 0 | 0 | 4.5 ppb |
| Norwalk Waterworks WI6420296 | 653 | 0 | 0 | 0 | 0 ppb |
| Warrens Waterworks WI6420305 | 540 | 0 | 0 | 0 | 0 ppb |
| Fort Mccoy South Post WI6420307 | 250 | 0 | 0 | 0 | 2.0 ppb |
| Cortland Acres WI6420299 | 145 | 0 | 0 | 0 | 2.1 ppb |
ZIP reports in Monroe County
No ZIP report in this county is published yet.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.