News Flash

City of Snohomish - NewsFlash

Posted on: February 12, 2020

Toxic Algae Alert

Toxic Algae Alert

Blackmans Lake is experiencing a blue-green algae bloom with scum accumulating along the shorelines.


A sample that was collected on 2/10/2020 confirmed that the algae species has the potential to produce toxins (neurotoxin or liver toxin). 


WARNING signs were posted at Hill Park and the public boat launch which provide guidance for lake recreation (see adjacent sign). It is especially important to avoid areas of algae scum because this is where toxin levels are the highest.

Toxic Algae Sign

The WARNING signs advise the following: 

  • Do not swim in the lake
  • Do not drink lake water
  • Keep pets away from the lake
  • Clean fish well and discard guts
  • Avoid areas of scum when boating


Toxic algae can cause serious illness in humans who drink or play in affected waters. Pets that drink the water are at particular risk. If you or your pet are exposed to a blue-green algae bloom and have unexplained sickness or signs of poisoning, call your health care provider or veterinarian.


Algae scum may look like green, blue or white paint floating on the water surface, often along the shoreline.Algae3







Please visit www.lakes.surfacewater.info to see up-to-date testing information, sign up for alerts, and answers to commonly asked questions (choose the “Toxic Algae” link from the main page).

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