Harmful cyanobacterial bloom advisories in Massachusetts

Harmful Cyanobacterial Bloom Advisories in Massachusetts current as of August 10, 2020

Updated: Aug. 12th, 2020, 8:20 am
  • Long Pond Marstons Mills – Barnstable
  • Lovell’s Pond – Barnstable
  • Shubael Pond Marstons Mills – Barnstable
  • Charles River (from New Charles Dam to Mass Ave Bridge) – Boston, Cambridge
  • Seymour Pond – Brewster
  • Lower Mill Pond – Easthampton
  • Nashawannuck Pond - Easthampton
  • Chebacco Lake – Essex, Hamilton
  • Dunn Pond – Gardner
  • Charles River (Lakes District) – Newton, Waltham, & Weston
  • Magnolia Pond – Northampton
  • Triangle Pond – Northampton
  • Nashua River (from Marion Stoddart Conservation Area to Yale Rd.) – Pepperell
  • Great Herring Pond – Plymouth
  • Halfway Pond – Plymouth

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.