Harmful cyanobacterial bloom advisories in Massachusetts

Harmful Cyanobacterial Bloom Advisories in Massachusetts current as of October 22, 2020

Updated: Oct. 23rd, 2020, 3:05 pm
  • Billy Ward Pond – Ashburnham
  • Lake Winnekeag – Ashburnham
  • Charles River (from New Charles Dam to Mass Ave Bridge) – Boston, Cambridge
  • Stiles Pond – Boxford
  • Brookline Reservoir – Brookline
  • Chilmark Pond – Chilmark
  • Squibnocket Pond – Chilmark
  • Chebacco Lake – Essex & Hamilton
  • Lake Cochituate (South Pond) – Framingham, Natick, & Wayland
  • Lake Warner – Hadley
  • Bare Hill Pond – Harvard
  • Plunkett Reservoir – Hinsdale
  • Cabot Pond – Mansfield
  • Santuit Pond – Mashpee
  • Sassaquin Pond – New Bedford
  • Magnolia Pond – Northampton
  • Triangle Pond – Northampton
  • Nashua River (from Marion Stoddart Conservation Area to Yale Rd.) – Pepperell
  • Big Sandy Pond – Plymouth
  • Big West Pond – Plymouth
  • Billington Sea – Plymouth
  • Clear Pond – Plymouth
  • Ezekiel Pond – Plymouth
  • Grassy West Pond – Plymouth
  • Halfway Pond – Plymouth
  • Island Pond – Plymouth
  • Little West Pond – Plymouth
  • Hardy Pond – Waltham
  • Lake Pearl – Wrentham

Please note: This should not be considered a complete list of all advisories in Massachusetts. This list includes waterbodies that have been reported to DPH by local, state and federal partners that manage or regulate the respective waterbody. If you think an algal bloom may be present you are encouraged to avoid contact with the water — WHEN IN DOUBT, STAY OUT! To see examples of what algae blooms look like, please visit the Identifying cyanobacterial blooms and scums web page.

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