State park beach closed for swimming due to blue green algae

The beach at Squantz Pond State Park, slightly north of Danbury, has been closed to swimmers because of the presence of blue green algae. The algae can emit toxins harmful to people and dogs.

State environmental officials announced the state park’s beach closing on Friday, before the weekend. Squantz Pond is essentially part of Candlewood Lake and in New Fairfield and Sherman.

Officials are monitoring the waters to assess conditions and tests are being conducted on water samples from the Squantz Pond swim area to determine the level of toxins and when the area will be safe to reopen for swimming.

The swimming area will be closed at least through the weekend.

Indian Well open to swimmers

Locally, testing shows the water at Indian Well State Park in Shelton is fine and it will be open for swimming this weekend.

A complete list of water quality testing results at designated Connecticut state park beaches — showing which beaches are open and which are closed — can be found at

Storm water runoff is factor

Blue-green algae, also known as cyanobacteria, occur naturally in lakes and ponds throughout Connecticut. These microscopic organisms often go unnoticed and cause no harm.

However, when temperatures are high and high levels of phosphorus are carried into waters as a result of storm water runoff, a water body can experience nuisance blue-green algae blooms that may produce and release toxins.

When blue-green algae blooms release toxins, people and pets using the water body for recreation can be affected.

“As we do with all of the designated swim areas at state parks, the state Department of Energy and Environmental Protection will continue to monitor these waters and conduct tests to determine when it is safe to reopen the area for swimming,” said DEEP Commissioner Robert Klee.

“Although the issue of blue green algae blooms is not new, there is now more research and understanding on the toxic effects of these blooms and public health concerns that they raise,” Klee said.

Can have negative effects

People who recreate in waters when a blue-green algae bloom is present may be exposed to toxins by ingesting or inhaling water or skin contact. Potential health effects to such exposure could include:

— Irritation of the skin, nose, eyes and respiratory tract.

— Gastrointestinal upset such as vomiting or diarrhea upon ingestion.

— Liver or nervous system effects, if relatively large amounts of the algae are ingested.