Blue-Green Algae warnings in New Hampshire

Update 7/16 – For the latest advisories, please see the sidebar on the right.

It’s summer time again and, with summer, comes the warnings about blue-green algae. According to the N.H. Department of Environmental Services, the algae can cause health effects ranging from skin and mucous membrane irritation to nausea and even central nervous system damage to both pets and people. If you notice a blue-green sheen to a pond or lake, it is better to be safe and keep you pets (and yourself) out of the water.

As of today, Cyanobacteria (Blue-Green Algae) has been found in the following places:

Updated – June 25, 2010


  • Showell Pond, Sandown (6/16)


  • Ahern State Park (6/24 – Bacteria)
  • Robinson Pond Town Beach, Hudson (6/16 – E.Coli)
  • Mill Pond Beach, Ossipee (6/24 – E.Coli)

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