 In Massachusetts, at least 37 beaches were closed Monday afternoon due to bacterial exceedance, according to the state's Department of Public Health. At least three beaches in Coronado, California, and the San Diego Bay have been closed since June 26th, also due to high levels of bacteria in the water. And on Long Island, New York, 63 beaches in Suffolk County last week issued an advisory against swimming due to increased bacteria levels caused by heavy rainfall and stormwater runoff.