Seth’s Pond in West Tisbury has been reopened for swimming, town board of health agent John Powers confirmed Tuesday morning.
The popular freshwater swimming pond off Lambert’s Cove Road had been closed since July 3 due to high levels of enterococcus bacteria.
On August 9 Mr. Powers said he had five clean water samples that met the state criteria for a geometric mean of levels at or below 33 colony forming units (CFU) per 100 milliliters of water.
He said the shallow depth of the pond during the dry summer could be affecting bacteria levels, as tests from the deep water came back better than those from shallow water.
“The pond is very low right now,” said Mr. Powers. “That has to do with the amount of rainfall, no snowfall last year. There is nothing recharging it.”
The pond also closed three times in June.
According to the state Department of Public Health, swimming in water with high levels of enterococci can be dangerous for young children, the elderly, and people with compromised immune systems.