Each week that the swim area at Candlewood Lake is open, the Danbury Health Department tests to ensure that the water is safe for recreational use. This season, employees were able to increase the number of tests conducted, to include testing for toxins produced by blue-green algae. The blooms are frequently found in freshwater systems. Some types the toxins are skin irritants and cause potent liver toxins for humans and domestic animals. Candlewood Lake’s levels has been consistently under the EPA’s recommendation.