Blue-Green Algae

The Wisconsin Division of Public Health collects information about human and animal illness resulting from exposure to blue-green algae. Tracking illness information will help the Wisconsin Division of Public Health 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!



Beginning 7/1/2018, healthcare providers should report any suspected human cases of Cyanobacteria and Cyanotoxin Poisoning electronically through WEDSS or by mailing or faxing a completed Acute and Communicable Disease Case Report, F-44151 to the address on the form.

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 (WebSurvey) 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: July 2, 2018