Indian Lake has reopened to recreational use after water testing showed that cyanobacteria levels have declined to concentrations that no longer pose a public health threat, city officials announced.
The lake had been closed after Worcester received test results Aug. 4 showing cyanobacteria concentrations exceeding the state’s recreational safety threshold.
According to the city’s announcement, subsequent testing found that cell densities had declined sufficiently to allow recreational activities to resume.
Cyanobacteria, sometimes called blue-green algae, occur naturally in freshwater but can multiply rapidly under certain conditions. Some blooms produce toxins that can be harmful to people and animals, making elevated concentrations a particular concern for swimmers, boaters and pet owners.
Worcester maintains an ongoing cyanobacteria monitoring and management program to protect recreational waters and wildlife.
Residents can find additional information about water quality and lake conditions on the city’s recreational waters webpage or contact the Department of Sustainability and Resilience at 508-799-8324.
