Blue-Green Algae

The Wisconsin Department of Health Services, Division of Public Health (DPH) collects information about human and animal illness resulting from exposure to blue-green algae.

Tracking illness information will help DPH measure the problem of blue-green algae in our lakes and rivers.

If you get sick after swimming in a Wisconsin lake or river, please report possible algae-related illness.

This program does not provide medical treatment, so if you are experiencing severe symptoms seek medical attention immediately.

Pond covered by algae

When in doubt, stay out!


For members of the general public and veterinarians: call 608-266-1120 or complete the online form Harmful Algae Bloom (HAB) Illness or Sighting Survey, F-02152 (Web Survey) to report any blue-green algae blooms and related human or animal illnesses to the Wisconsin Harmful Algal Blooms Program.


Questions? Call 608-266-1120 or email us.

Last Revised: September 21, 2021