 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. Officials in Massachusetts identified the bacteria Enterococci, typically found in the intestinal tracts of warm-blooded animals, including humans.