Cyanobacteria Alert – June 4 2026

"When in Doubt, Please Stay Out."

A potentially toxic cyanobacteria bloom has been identified at the following pond(s):

Mares Pond, Falmouth
Snake Pond, Sandwich
Queen Sewell Pond, Bourne

The towns have been notified of the findings. If you have any questions, contact the local health department.

You can view the most recent sampling date and results on our interactive map.

Avoid contact, particularly incidental ingestion of pond water that can occur during swimming. Dogs and children are especially susceptible to cyanotoxins through ingestion.

Frequently asked questions about cyanobacteria, click here.

If you see a possible bloom in a pond, avoid it and notify your local board of health. Take a picture, note the location and date and send to cyano@apcc.org

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