Harmful Cyanobacterial Bloom Advisories in Massachusetts current as of July 17, 2024

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

  • Hopkinton Reservoir, Ashland/Hopkinton
  • Long Pond Marston Mills, Barnstable
  • Capaum Pond, Nantucket
  • Head of Hummock Pond, Nantucket
  • Gibbs Pond, Nantucket
  • Lower Mill Pond, Brewster
  • Upper Mill Pond, Brewster
  • Rubber Thread Pond, Easthampton
  • Pillings Pond, Lynnfield
  • Lake Cochituate – South Pond, Natick
  • Clear Pond, Plymouth
  • Great Herring Pond, Plymouth
  • Wildwood Lake, Upton
  • Quaboag Pond, Brookfield
  • Carbuncle Beach, Oxford
  • Waushakum Pond, Framingham

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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