جريان المياه السطحية
Suburbanization of its watershed area led to an increase in water pollution. Surface runoff brought increased sediment while residential drain fields and increased use of fertilizers rich in nitrogen and phosphorus contributed to eutrophication. DDT was also used for mosquito control until its effects on fish and birds became apparent, and the county discontinued it. A 2005 report showed higher than normal levels of various contaminants in the lake's fish.