Harmful Cyanobacterial Bloom Advisories in Massachusetts current as of July 12, 2024

This list includes waterbodies that have been reported to DPH by local, state and federal partners that manage or regulate the respective waterbody.

  • Long Pond Marston Mills, Barnstable
  • Capaum Pond, Nantucket
  • Gibbs Pond, Nantucket
  • Hopkinton Reservoir, Ashland/Hopkinton
  • Lower Mill Pond, Brewster
  • Upper Mill Pond, Brewster
  • Rubber Thread Pond, Easthampton
  • Pillings Pond, Lynnfield
  • John’s Pond, Mashpee
  • Head of Hummock Pond, Nantucket
  • Lake Cochituate – South Pond, Natick
  • Clear Pond, Plymouth
  • Great Herring Pond, Plymouth
  • Wildwood Lake, Upton

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 page.

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