The U.S. Environmental Protection Agency along with state and tribal agencies will conduct a three-year study of the nation's lakes, the EPA announced on 6 December. The study will assess the state of health of the lakes and determine the relative importance of key stressors on lake systems, such as nutrients and pathogens.
The survey will cover 909 bodies of water in the conterminous United States, though not the Great Lakes or the Great Salt Lake. At each lake, sampling will include chemical quality, nutrients, chlorophyll a, color, turbidity, ecological indicators, algal toxins, and pathogen indicators. The EPA last conducted a survey of lakes in 1972–1976.