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Photos of Algal Blooms

Despite their name, blue-green algae can be a variety of colors. Blooms can be blue, green, brown, white or a combination of colors. Do you want to share a picture of blue-green algae from your local lake?

Email photos with a description of the bloom and the location to DHSEnvHealth@dhs.wisconsin.gov.

Chetac
Blooms on Lake Chetac in Sawyer County in July 2014.
Blue-Green Algae Tainter Lake
An algal scum on Tainter Lake in Dunn County during the summer of 2010.
Blue-Green Algae
A decaying algal mat on Lake Kegonsa in Dane County during June of 2010.
Blue-Green Algae Fox Lake
A multi-colored algal bloom on Fox Lake in Dodge County.
Blue-Green Algae
A green paint-like algal bloom

Report blue-green algae-related illness

Members of the general public and veterinarians should 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.

Last revised February 27, 2024