Crystal Lake’s public beach will remain closed to swimmers after water samples confirmed elevated levels of cyanobacteria, Manchester health officials said Thursday.
The toxic algae bloom was first detected during routine water sampling on June 30, with laboratory analysis confirming the presence of cyanobacteria. Follow-up samples collected Thursday showed levels still above acceptable limits, according to the Manchester Health Department.
Cyanobacteria blooms produce toxins that can harm humans and animals. The New Hampshire Department of Environmental Services warns people to avoid water that appears “scummy,” turbid, colorful or contains concentrated flecks.
Health officials advise against all water contact, including swimming, wading and kayaking near the bloom. Pet owners should keep animals away from the affected area.
The beach closure will continue until no visible evidence of the bloom remains and water samples return to acceptable levels. The New Hampshire Public Health Laboratory is assisting with expedited testing.
Manchester health officials plan to reassess the area Monday and collect new water samples. Results will be announced in a subsequent press release.