Blackmans Lake is experiencing a blue-green algae bloom with scum floating on the lake surface and shoreline.
A sample was screened for toxins by Snohomish County staff on Monday, October 28th. Microcystins (a liver toxin) was present and above the State guidance level set by the Washington Department of Health (DOH). WARNING signs are posted at the public boat launch and Hill Park. Please be aware that lake conditions and locations of algae scum can change from day to day. If you see algae scum, please contact the Snohomish County lakes group at lakes@snoco.org and follow the advice on the WARNING sign. It is very important to avoid areas of algae scum because this is where the toxin levels are the highest.
You may also visit www.nwtoxicalgae.org or https://doh.wa.gov/community-and-environment/contaminants/cyanobacteria to learn more about toxic algae.