In the peak of summer, a number of local beaches are closing due to spikes in bacteria levels, as well as harmful algae blooms.
The Massachusetts Department of Public Health monitors the state’s public beaches, curating a list of beaches deemed unsafe for swimming.
A total of 60 Massachusetts beaches are currently closed, the vast majority of which are caused by “bacterial exceedance,” including the Littleton Town Beach, Townsend’s Pearl Hill Pond, Ashby’s Damon Pond Beach and Westminster’s Crow Hill Pond Beach, the last three of which are state Department of Conservation and Recreation properties.
Chelmsford’s Health Department announced Heart Pond would be closed indefinitely, starting Monday morning, due to a “harmful algal bloom,” according to a notice posted on the town’s website.
Mark Masiello, Chelmsford’s environmental health inspector, said the state now has to visit to test the water and determine when they’ll reopen it. Heart Pond will be closed for about seven days, Masiello said, but that could become longer or shorter, depending on the state’s findings.
The town typically closes Heart Pond based on visible algae inlet, Masiello said, but the DPH will need to test the pond again next week, as algae can be hidden below the surface.
“A swimmer did say to the lifeguard [Monday] morning that when they were outside the swimming area, that when they got out of water, there was green all over their arms,” Masiello said.
Most common in the late summer and early fall months, algae blooms can be toxic and “release harmful gases,” according to the DPH’s website. Signs are now posted around Heart Pond forbidding people and their pets from swimming, wading or boating in the water, and those who do come in contact are asked to rinse off.
Lowell’s Rynne Beach was closed Friday for “high bacteria levels,” according to an alert on the city’s website. The Lowell Health Department stated the beach would reopen when those levels dropped, and the water would be tested every 48 hours. It’s unclear whether the beach is still closed, and Director of Health and Human Services Lisa Golden did not respond to requests for comment Monday.
Nashoba Associated Boards of Health, which oversees, in part, Littleton and Townsend, did not respond to requests for comment.
Around this time last summer, the Tewksbury Health Department found three times the state limit of cyanobacteria in Long Pond.