State officials warn of algae bloom along Charles River

Officials will retest the river until cyanobacteria levels return to acceptable limits.

A toxic algae present in the Charles River gave a green cast to the water in Cambridge earlier this summer. People were urged to avoid contact with the water.
A toxic algae present in the Charles River gave a green cast to the water in Cambridge. People are being urged to avoid contact with the water. –Jessica Rinaldi / The Boston Globe

BOSTON (AP) — Massachusetts officials are advising people not to wade into parts of the Charles River because of a dangerous algae bloom.

The state Department of Conservation and Recreation said Thursday a cyanobacteria bloom has been detected in the river. It’s advising people and pets to avoid all contact with the water from the Boston University bridge to the Museum of Science until further notice.

Officials will retest the river until cyanobacteria levels return to acceptable limits.

The 80-mile river scored a “B” grade for water quality from the U.S. Environmental Protection Agency last month. The once-industrial river earned an “A-minus” last year.

Advertisement

An “A” grade means the river almost always met standards for boating and swimming. A “B” means it met standards for almost all boating and some swimming.

Close

Get the latest breaking news sent directly to your phone. Download our free app.