There Are Over 30 Harmful Algae Blooms In Massachusetts Lakes And Ponds Right Now: See The List

CBS Boston

August 8, 2025

Health officials in Massachusetts are spreading the word about harmful blooms of cyanobacteria, also known as blue-green algae, in lakes and ponds around the state.

In Plymouth, the public health director told WBZ-TV that there are six ponds with cyanobacteria blooms that can make people and dogs "very sick." Signs are posted on the beaches to tell people not to swim at the water, and to keep their dogs away from shore.

In Brookline on Tuesday, the town warned that a harmful bloom has been confirmed at the Brookline Reservoir, which is a popular walking area. Fishing is banned at the reservoir and no pets are allowed until further notice, the town said. Anyone who makes contact with the algae should rinse off immediately.

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