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Lifted - Health Advisory: Expanded Cyanobacteria Algae Bloom Advisory for Charles River Lower Basin

Update: As of September 22, 2026, the advisory for the Charles River Lower Basin at all points downstream of the Boston University Duan Family Center for Computing and Data Sciences Building has been...

Lifted - Health Advisory: Charles River Lower Basin Affected by Cyanobacteria Algae Bloom

Update: As of September 22, 2026, the advisory for the Charles River Lower Basin at all points downstream of the Massachusetts Ave. Bridge has been lifted.

Lifted - Health Advisory: Officials Investigating Charles River for Cyanobacteria Algae Bloom

Update: As of August 25, 2026, the advisory for the Charles River between Kendrick Street in Needham and Spring Street in West Roxbury has been lifted.

Lifted - Health Advisory: Cyanobacteria Bloom Expands in the Charles River

Update: As of October 23, 2025, the advisories for the entire Charles River Lower Basin have been lifted. This includes the MIT Richard J. Resch Boathouse, Community Boating, and the Broad Canal area.

Lifted - Health Advisory: Back Bay Fens Waterway Affected By Cyanobacteria Algae Bloom

Update: As of October 30, 2025, this health advisory has been lifted.

Lifted - Health Advisory: Sprague Pond In Hyde Park Affected By Cyanobacteria Algae

Update: As of October 30, 2025, this health advisory has been lifted.

Lifted - Health Advisory: Cyanobacteria Algae In a Section of The Muddy River in Fenway

Avoid Contact with Water in the Muddy River Between Brookline Avenue and Avenue Louis Pasteur

Lifted - Health Advisory: Cyanobacteria in the Charles River

Update: As of October 22, 2025, this health advisory has been lifted.

Lifted - Health Advisory: Cyanobacteria Algae Blooming Sprague Pond

The Boston Public Health Commission (BPHC) is alerting residents that the Massachusetts Department of Public Health (DPH) has lifted the public health advisory issued for cyanobacteria algae bloom in...

HEALTH ADVISORY: Cyanobacteria Algae Bloom in the Charles River

Avoid Contact with Water Downstream of Longfellow Bridge - Broad Canal, Lechmere Canal, North Point Park, Lederman Park
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