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Bacteria bloom warning at Hothole Pond in Loudon

  • New Hampshire Department of Environmental Services issued a warning about a cyanobacteria bloom at Hot Hole Pond in Loudon last week. ELODIE REED

  • New Hampshire Department of Environmental Services issued a warning about a cyanobacteria bloom at Hot Hole Pond in Loudon last week. ELODIE REED


Monitor staff
Monday, August 20, 2018

A bloom of cyanobacteria in Hothole Pond near the Concord-Loudon border has led state officials to caution people about swimming there.

New Hampshire Department of Environmental Services says samples collected last week revealed a bloom of what is sometimes inaccurately called blue-green algae. It has issued an advisory, telling people to avoid water with a “surface scum, green streaks or blue-green flecks aggregating along the shore.”

Officials also caution pet owners to keep their animals, particularly dogs, away. Dogs that drink water with blooms can get sick.

Once a cyanobacteria advisory has been issued, DES returns weekly until the cyanobacteria standards are again met.

Cyanobacteria are natural components of water bodies worldwide, but blooms and surface scums may form when excess nutrients are available. Some cyanobacteria produce toxins that are stored within the cells but released upon cell death, causing potential health effects.

For more information check the DES Beach Program website: https://www.des.nh.gov/organization/divisions/water/wmb/beaches/index.htm