State
Wisconsin: drinking water records
EPA lists 983 community water systems serving homes in Wisconsin. 196 took part in EPA's national PFAS survey (UCMR 5), and 52 found at least one PFAS above the level laboratories can measure.
In focus983community water systems
Public records. Clearer context.
0
ZIP reports published
983
community water systems
361
systems with a health-based violation since 2016
77
systems that reached the lead action level since 2016
Counties
- Adams County 9 systems
- Ashland County 5 systems
- Barron County 14 systems
- Bayfield County 7 systems
- Brown County 22 systems
- Buffalo County 6 systems
- Burnett County 4 systems
- Calumet County 10 systems
- Chippewa County 11 systems
- Clark County 12 systems
- Columbia County 23 systems
- Crawford County 9 systems
- Dane County 43 systems
- Dodge County 23 systems
- Door County 6 systems
- Douglas County 4 systems
- Dunn County 13 systems
- Eau Claire County 14 systems
- Florence County 2 systems
- Fond du Lac County 15 systems
- Forest County 5 systems
- Grant County 28 systems
- Green County 10 systems
- Green Lake County 5 systems
- Iowa County 15 systems
- Iron County 5 systems
- Jackson County 11 systems
- Jefferson County 19 systems
- Juneau County 16 systems
- Kenosha County 25 systems
- Kewaunee County 4 systems
- La Crosse County 19 systems
- Lafayette County 9 systems
- Langlade County 3 systems
- Lincoln County 3 systems
- Manitowoc County 14 systems
- Marathon County 23 systems
- Marinette County 9 systems
- Marquette County 5 systems
- Menominee County 0 systems
- Milwaukee County 17 systems
- Monroe County 11 systems
- Oconto County 8 systems
- Oneida County 8 systems
- Outagamie County 19 systems
- Ozaukee County 47 systems
- Pepin County 3 systems
- Pierce County 11 systems
- Polk County 12 systems
- Portage County 9 systems
- Price County 5 systems
- Racine County 12 systems
- Richland County 6 systems
- Rock County 18 systems
- Rusk County 8 systems
- Sauk County 23 systems
- Sawyer County 10 systems
- Shawano County 10 systems
- Sheboygan County 17 systems
- St. Croix County 12 systems
- Taylor County 7 systems
- Trempealeau County 14 systems
- Vernon County 14 systems
- Vilas County 8 systems
- Walworth County 27 systems
- Washburn County 6 systems
- Washington County 13 systems
- Waukesha County 73 systems
- Waupaca County 11 systems
- Waushara County 8 systems
- Winnebago County 11 systems
- Wood County 13 systems
ZIP reports
Sources
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.