We lead projects to measure, monitor and improve water quality in the many streams and rivers that drain into Puget Sound. Because water flows across geographical and political boundaries, water areas are identified not by county or city, but by a common point to which they drain. These water areas are called watersheds and basins. 

Watershed and basin studies help Thurston County understand how water moves across the landscape and where pollution comes from. This information helps us identify projects that reduce polluted runoff, protect drinking water aquifers, and improve habitat for frogs, fish, shellfish, and other wildlife. The County's pollution reduction activities are mandated and monitored by the U.S. Environmental Protection Agency and Washington State Legislature. Find details on the Stormwater Management Program page.