Blue-green Algae in Wisconsin
3 confirmed blue-green algae reports in Wisconsin, none currently active. About this disease: symptoms and prevention.
3
Reports on record
0
Currently active
0
Last 7 days
0
Last 30 days
Where in the state
1
Recent reports
Blue-green Algae
Historical · Sep 4, 2026
Altoona
Lake Altoona Beach, 604 S Beach Dr; beach closed and a countywide advisory issued, toxin levels high enough to harm people and animals
Source ↗Blue-green Algae
Historical · Aug 21, 2026
East Troy
Booth Lake, Town of Troy, Walworth County; microcystin confirmed, state investigated 9 illness reports; elevated toxins expected through swim season
Source ↗Blue-green Algae
Historical · Aug 13, 2026
Mosinee, Marathon County
Lake Du Bay, advisory re-issued 8/13, spans Marathon and Portage counties
Source ↗