DEEP officials have announced the closing of five state park beaches to swimmers on Tuesday due to bacteria being present in the water. The following state parks are closed due to the water quality: \u2013 Indian Well State Park in Shelton \u2013 Silver Sands State Park in Milford \u2013 Kettletown State Park in Southbury \u2013 Wadsworth Falls State Park in Middlefield \u2013 Wharton Brook State Park in Wallingford DEEP explains that indicator bacteria are not disease causing pathogens but tools used to evaluate the potential for contamination of water-bodies. The water quality of state parks is tested by DEEP to ensure it\u2019s safe for swimming. The samples are collected and then analyzed at the Department of Public Health Lab. Municipal swimming areas are sampled by local health departments.