Help CLF Stop Toxic Blue-Green Algae

Algae on the water's surface with a "Not suitable for swimming" sign posted next to the water.

Seen any scummy algae on your local water body? Tell us about it!

When polluted runoff drains into our rivers, lakes, ponds, and streams, toxic outbreaks of blue-green algae can grow out-of-control in a thin layer of scum on top of the water. Contact with the algae can cause stomach aches, neurological symptoms, and other illnesses.

We need your help to locate algae outbreaks in Massachusetts waters: Please fill out this form within 24 hours if you spot algae outbreaks in the water near you!

How can you tell if it’s blue-green algae? You’ll see:

Blue-green, green or brownish scum covering the water’s surface
Globs of thick algae
Foam at the edges of the water

First Name

Last Name

Email Address

What is the name of the river, lake, pond, or stream where you spotted algae?

Please describe approximately what area of the water body you spotted the algae.

When did you see this algae?

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