Cyanobacteria Alert – May 22 2026

Above: Mystic Lake, Barnstable, May 20, 2026

 

“When in Doubt, Please Stay Out.”

A potentially toxic cyanobacteria bloom has been observed at

Hamblin Pond, Barnstable

Mystic Lake, Barnstable

 

The town has posted a pet advisory. If you have any questions, contact the local health department.

 

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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