Cyanobacteria Alert – July 1 2025

Above: Long Pond, Marstons Mills on June 30, 2025 APCC

“When in Doubt, Please Stay Out.”

Recent News from

APCC’s Cyanobacteria Monitoring Program

Please be advised that potentially toxic blooms have been identified on the following ponds:

Long Pond Marstons Mills, Barnstable
Long Pond Centerville, Barnstable
Crystal Lake, Barnstable
Santuit Pond, Mashpee

Town officials have been notified.

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.   APCC’s monitoring data is posted on APCC’s interactive map.    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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