Wisconsin County Water Quality Reports

Adams County, WI: 3 Health Violations — 65/100 (2026)

2026 report: Adams County, WI scores 65/100 (Grade C). 8 ZIP codes analyzed. 24 EPA violations found. Free report with contaminant data and filter picks.

Ashland County, WI: Lead Above EPA Limits — 64/100 (2026)

2026 report: Ashland County, WI scores 64/100 (Grade C). 9 ZIP codes analyzed. 39 EPA violations found. Lead above EPA limits. Free report with contamin...

Barron County, WI: 6 Health Violations — 72/100 (2026)

2026 report: Barron County, WI scores 72/100 (Grade B). 16 ZIP codes analyzed. 83 EPA violations found. Free report with contaminant data and filter picks.

Bayfield County, WI: 2 Health Violations — 68/100 (2026)

2026 report: Bayfield County, WI scores 68/100 (Grade C). 12 ZIP codes analyzed. 17 EPA violations found. Free report with contaminant data and filter p...

Brown County, WI: Lead Above EPA Limits — 76/100 (2026)

2026 report: Brown County, WI scores 76/100 (Grade B). 22 ZIP codes analyzed. 81 EPA violations found. Lead above EPA limits. Free report with contamina...

Buffalo County, WI: 2 Health Violations — 62/100 (2026)

2026 report: Buffalo County, WI scores 62/100 (Grade C). 6 ZIP codes analyzed. 13 EPA violations found. Free report with contaminant data and filter picks.

Burnett County, WI: 1 Health Violation — 81/100 (2026)

2026 report: Burnett County, WI scores 81/100 (Grade B). 4 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter picks.

Calumet County, WI: 4 Health Violations — 74/100 (2026)

2026 report: Calumet County, WI scores 74/100 (Grade B). 11 ZIP codes analyzed. 20 EPA violations found. Free report with contaminant data and filter pi...

Chippewa County, WI: Lead Above EPA Limits — 70/100 (2026)

2026 report: Chippewa County, WI scores 70/100 (Grade B). 11 ZIP codes analyzed. 34 EPA violations found. Lead above EPA limits. Free report with contam...

Clark County, WI: Lead Above EPA Limits — 74/100 (2026)

2026 report: Clark County, WI scores 74/100 (Grade B). 15 ZIP codes analyzed. 41 EPA violations found. Lead above EPA limits. Free report with contamina...

Columbia County, WI: Lead Above EPA Limits — 72/100 (2026)

2026 report: Columbia County, WI scores 72/100 (Grade B). 13 ZIP codes analyzed. 57 EPA violations found. Lead above EPA limits. Free report with contam...

Crawford County, WI: Lead Above EPA Limits — 54/100 (2026)

2026 report: Crawford County, WI scores 54/100 (Grade D). 11 ZIP codes analyzed. 23 EPA violations found. Lead above EPA limits. Free report with contam...

Dane County, WI: 116 Health Violations — 62/100 (2026)

2026 report: Dane County, WI scores 62/100 (Grade C). 58 ZIP codes analyzed. 467 EPA violations found. Free report with contaminant data and filter picks.

Dodge County, WI: Lead Above EPA Limits — 52/100 (2026)

2026 report: Dodge County, WI scores 52/100 (Grade D). 21 ZIP codes analyzed. 61 EPA violations found. Lead above EPA limits. Free report with contamina...

Door County, WI: 17 Violations — 58/100 (2026)

2026 report: Door County, WI scores 58/100 (Grade C). 12 ZIP codes analyzed. 17 EPA violations found. Free report with contaminant data and filter picks.

Douglas County, WI: 10 Health Violations — 60/100 (2026)

2026 report: Douglas County, WI scores 60/100 (Grade C). 10 ZIP codes analyzed. 48 EPA violations found. Free report with contaminant data and filter pi...

Dunn County, WI: 3 Health Violations — 75/100 (2026)

2026 report: Dunn County, WI scores 75/100 (Grade B). 8 ZIP codes analyzed. 30 EPA violations found. Free report with contaminant data and filter picks.

Eau Claire County, WI: 5 Health Violations — 75/100 (2026)

2026 report: Eau Claire County, WI scores 75/100 (Grade B). 8 ZIP codes analyzed. 48 EPA violations found. Free report with contaminant data and filter ...

Florence County, WI: 3 Health Violations — 65/100 (2026)

2026 report: Florence County, WI scores 65/100 (Grade C). 2 ZIP codes analyzed. 14 EPA violations found. Free report with contaminant data and filter pi...

Fond du Lac County, WI: Lead Above EPA Limits — 53/100

2026 report: Fond du Lac County, WI scores 53/100 (Grade D). 18 ZIP codes analyzed. 60 EPA violations found. Lead above EPA limits. Free report with con...

Forest County, WI: 4 Health Violations — 70/100 (2026)

2026 report: Forest County, WI scores 70/100 (Grade B). 7 ZIP codes analyzed. 12 EPA violations found. Free report with contaminant data and filter picks.

Grant County, WI: PFAS Found in Water — 64/100 (2026)

2026 report: Grant County, WI scores 64/100 (Grade C). 20 ZIP codes analyzed. 93 EPA violations found. PFAS detected. Free report with contaminant data ...

Green County, WI: 5 Health Violations — 63/100 (2026)

2026 report: Green County, WI scores 63/100 (Grade C). 6 ZIP codes analyzed. 21 EPA violations found. Free report with contaminant data and filter picks.

Green Lake County, WI: 2 Health Violations — 57/100 (2026)

2026 report: Green Lake County, WI scores 57/100 (Grade C). 7 ZIP codes analyzed. 11 EPA violations found. Free report with contaminant data and filter ...

Iowa County, WI: Lead Above EPA Limits — 64/100 (2026)

2026 report: Iowa County, WI scores 64/100 (Grade C). 14 ZIP codes analyzed. 53 EPA violations found. Lead above EPA limits. Free report with contaminan...

Iron County, WI: 2 Health Violations — 66/100 (2026)

2026 report: Iron County, WI scores 66/100 (Grade C). 9 ZIP codes analyzed. 9 EPA violations found. Free report with contaminant data and filter picks.

Jackson County, WI: 5 Health Violations — 79/100 (2026)

2026 report: Jackson County, WI scores 79/100 (Grade B). 6 ZIP codes analyzed. 22 EPA violations found. Free report with contaminant data and filter picks.

Jefferson County, WI: 15 Health Violations — 55/100 (2026)

2026 report: Jefferson County, WI scores 55/100 (Grade C). 13 ZIP codes analyzed. 57 EPA violations found. Free report with contaminant data and filter ...

Juneau County, WI: 4 Health Violations — 80/100 (2026)

2026 report: Juneau County, WI scores 80/100 (Grade B). 9 ZIP codes analyzed. 21 EPA violations found. Free report with contaminant data and filter picks.

Kenosha County, WI: 51 Health Violations — 67/100 (2026)

2026 report: Kenosha County, WI scores 67/100 (Grade C). 21 ZIP codes analyzed. 217 EPA violations found. Free report with contaminant data and filter p...

Kewaunee County, WI: Lead Above EPA Limits — 62/100 (2026)

2026 report: Kewaunee County, WI scores 62/100 (Grade C). 3 ZIP codes analyzed. 4 EPA violations found. Lead above EPA limits. Free report with contamin...

La Crosse County, WI: 7 Health Violations — 78/100 (2026)

2026 report: La Crosse County, WI scores 78/100 (Grade B). 10 ZIP codes analyzed. 93 EPA violations found. Free report with contaminant data and filter ...

Lafayette County, WI: 6 Health Violations — 62/100 (2026)

2026 report: Lafayette County, WI scores 62/100 (Grade C). 9 ZIP codes analyzed. 19 EPA violations found. Free report with contaminant data and filter p...

Langlade County, WI: 7 Health Violations — 48/100 (2026)

2026 report: Langlade County, WI scores 48/100 (Grade D). 9 ZIP codes analyzed. 24 EPA violations found. Free report with contaminant data and filter pi...

Lincoln County, WI: 2 Health Violations — 67/100 (2026)

2026 report: Lincoln County, WI scores 67/100 (Grade C). 6 ZIP codes analyzed. 10 EPA violations found. Free report with contaminant data and filter picks.

Manitowoc County, WI: Lead Above EPA Limits — 67/100 (2026)

2026 report: Manitowoc County, WI scores 67/100 (Grade C). 16 ZIP codes analyzed. 30 EPA violations found. Lead above EPA limits. Free report with conta...

Marathon County, WI: 8 Health Violations — 60/100 (2026)

2026 report: Marathon County, WI scores 60/100 (Grade C). 17 ZIP codes analyzed. 64 EPA violations found. Free report with contaminant data and filter p...

Marinette County, WI: 4 Health Violations — 70/100 (2026)

2026 report: Marinette County, WI scores 70/100 (Grade B). 13 ZIP codes analyzed. 30 EPA violations found. Free report with contaminant data and filter ...

Marquette County, WI: 2 Health Violations — 71/100 (2026)

2026 report: Marquette County, WI scores 71/100 (Grade B). 4 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter pi...

Milwaukee County, WI: 86 Health Violations — 77/100 (2026)

2026 report: Milwaukee County, WI scores 77/100 (Grade B). 48 ZIP codes analyzed. 1746 EPA violations found. Free report with contaminant data and filte...

Monroe County, WI: 7 Health Violations — 69/100 (2026)

2026 report: Monroe County, WI scores 69/100 (Grade C). 12 ZIP codes analyzed. 22 EPA violations found. Free report with contaminant data and filter picks.

Oconto County, WI: 6 Health Violations — 73/100 (2026)

2026 report: Oconto County, WI scores 73/100 (Grade B). 12 ZIP codes analyzed. 19 EPA violations found. Free report with contaminant data and filter picks.

Oneida County, WI: 6 Health Violations — 64/100 (2026)

2026 report: Oneida County, WI scores 64/100 (Grade C). 11 ZIP codes analyzed. 40 EPA violations found. Free report with contaminant data and filter picks.

Outagamie County, WI: Lead Above EPA Limits — 72/100 (2026)

2026 report: Outagamie County, WI scores 72/100 (Grade B). 17 ZIP codes analyzed. 29 EPA violations found. Lead above EPA limits. Free report with conta...

Ozaukee County, WI: 3 Health Violations — 72/100 (2026)

2026 report: Ozaukee County, WI scores 72/100 (Grade B). 9 ZIP codes analyzed. 23 EPA violations found. Free report with contaminant data and filter picks.

Pepin County, WI: 5 Health Violations — 52/100 (2026)

2026 report: Pepin County, WI scores 52/100 (Grade D). 4 ZIP codes analyzed. 14 EPA violations found. Free report with contaminant data and filter picks.

Pierce County, WI: 3 Health Violations — 61/100 (2026)

2026 report: Pierce County, WI scores 61/100 (Grade C). 10 ZIP codes analyzed. 18 EPA violations found. Free report with contaminant data and filter picks.

Polk County, WI: 2 Health Violations — 76/100 (2026)

2026 report: Polk County, WI scores 76/100 (Grade B). 13 ZIP codes analyzed. 12 EPA violations found. Free report with contaminant data and filter picks.

Portage County, WI: 31 Health Violations — 53/100 (2026)

2026 report: Portage County, WI scores 53/100 (Grade D). 9 ZIP codes analyzed. 183 EPA violations found. Free report with contaminant data and filter pi...

Price County, WI: 3 Health Violations — 76/100 (2026)

2026 report: Price County, WI scores 76/100 (Grade B). 6 ZIP codes analyzed. 14 EPA violations found. Free report with contaminant data and filter picks.

Racine County, WI: PFAS Found in Water — 74/100 (2026)

2026 report: Racine County, WI scores 74/100 (Grade B). 18 ZIP codes analyzed. 192 EPA violations found. PFAS detected. Free report with contaminant dat...

Richland County, WI: 5 Health Violations — 60/100 (2026)

2026 report: Richland County, WI scores 60/100 (Grade C). 8 ZIP codes analyzed. 19 EPA violations found. Free report with contaminant data and filter pi...

Rock County, WI: 12 Health Violations — 57/100 (2026)

2026 report: Rock County, WI scores 57/100 (Grade C). 15 ZIP codes analyzed. 57 EPA violations found. Free report with contaminant data and filter picks.

Rusk County, WI: 5 Health Violations — 70/100 (2026)

2026 report: Rusk County, WI scores 70/100 (Grade B). 9 ZIP codes analyzed. 52 EPA violations found. Free report with contaminant data and filter picks.

Sauk County, WI: 8 Health Violations — 74/100 (2026)

2026 report: Sauk County, WI scores 74/100 (Grade B). 13 ZIP codes analyzed. 44 EPA violations found. Free report with contaminant data and filter picks.

Sawyer County, WI: 4 Health Violations — 70/100 (2026)

2026 report: Sawyer County, WI scores 70/100 (Grade B). 9 ZIP codes analyzed. 30 EPA violations found. Free report with contaminant data and filter picks.

Shawano County, WI: 3 Health Violations — 52/100 (2026)

2026 report: Shawano County, WI scores 52/100 (Grade D). 19 ZIP codes analyzed. 23 EPA violations found. Free report with contaminant data and filter pi...

Sheboygan County, WI: 7 Health Violations — 76/100 (2026)

2026 report: Sheboygan County, WI scores 76/100 (Grade B). 15 ZIP codes analyzed. 31 EPA violations found. Free report with contaminant data and filter ...

St. Croix County, WI: 6 Health Violations — 66/100 (2026)

2026 report: St. Croix County, WI scores 66/100 (Grade C). 13 ZIP codes analyzed. 34 EPA violations found. Free report with contaminant data and filter ...

Taylor County, WI: 8 Health Violations — 74/100 (2026)

2026 report: Taylor County, WI scores 74/100 (Grade B). 8 ZIP codes analyzed. 41 EPA violations found. Free report with contaminant data and filter picks.

Trempealeau County, WI: Lead Above EPA Limits — 74/100

2026 report: Trempealeau County, WI scores 74/100 (Grade B). 11 ZIP codes analyzed. 29 EPA violations found. Lead above EPA limits. Free report with con...

Vernon County, WI: 11 Health Violations — 62/100 (2026)

2026 report: Vernon County, WI scores 62/100 (Grade C). 11 ZIP codes analyzed. 65 EPA violations found. Free report with contaminant data and filter picks.

Vilas County, WI: 2 Health Violations — 68/100 (2026)

2026 report: Vilas County, WI scores 68/100 (Grade C). 6 ZIP codes analyzed. 11 EPA violations found. Free report with contaminant data and filter picks.

Walworth County, WI: PFAS Found in Water — 55/100 (2026)

2026 report: Walworth County, WI scores 55/100 (Grade C). 15 ZIP codes analyzed. 97 EPA violations found. PFAS detected. Free report with contaminant da...

Washburn County, WI: 2 Health Violations — 68/100 (2026)

2026 report: Washburn County, WI scores 68/100 (Grade C). 7 ZIP codes analyzed. 21 EPA violations found. Free report with contaminant data and filter pi...

Washington County, WI: 3 Health Violations — 62/100 (2026)

2026 report: Washington County, WI scores 62/100 (Grade C). 10 ZIP codes analyzed. 20 EPA violations found. Free report with contaminant data and filter...

Waukesha County, WI: PFAS Found in Water — 58/100 (2026)

2026 report: Waukesha County, WI scores 58/100 (Grade C). 32 ZIP codes analyzed. 256 EPA violations found. PFAS detected. Free report with contaminant d...

Waupaca County, WI: 2 Health Violations — 53/100 (2026)

2026 report: Waupaca County, WI scores 53/100 (Grade D). 14 ZIP codes analyzed. 16 EPA violations found. Free report with contaminant data and filter pi...

Waushara County, WI: 1 Health Violation — 71/100 (2026)

2026 report: Waushara County, WI scores 71/100 (Grade B). 10 ZIP codes analyzed. 13 EPA violations found. Free report with contaminant data and filter p...

Winnebago County, WI: 21 Health Violations — 63/100 (2026)

2026 report: Winnebago County, WI scores 63/100 (Grade C). 15 ZIP codes analyzed. 82 EPA violations found. Free report with contaminant data and filter ...

Wood County, WI: Lead Above EPA Limits — 52/100 (2026)

2026 report: Wood County, WI scores 52/100 (Grade D). 15 ZIP codes analyzed. 51 EPA violations found. Lead above EPA limits. Free report with contaminan...