A sample collected on the lake tested positive as a cyanobacteria bloom prompting the state to issue an advisory effective today. Advisories are issued when cyanobacterial cell concentrations exceed 70,000 cells/ml. The sample tested was 365,000 cells per milliliter.

NHDES advises lake users to avoid contact with the water in areas experiencing elevated cyanobacteria cell conditions, also known as a bloom. NHDES also advises pet owners to keep their pets out of any waters that have a cyanobacteria bloom. Cyanobacteria toxins can cause both acute and chronic health effects that range in severity. Acute health effects include irritation of skin and mucous membranes, tingling, numbness, nausea, vomiting, seizures and diarrhea. Chronic effects may include liver and central nervous system damage. Be cautious of lake water that has a surface scum, changes colors, or appears to have green streaks or blue-green flecks aggregating along the shore.

The full announcement can be found here.