Conserve Prince William
Prince William Conservation Alliance is a nonprofit watershed organization working to protect natural resources and healthy communities through stewardship, recreation and education.
General Information
Streams, Stormwater and Low Impact Development
Prince William Watersheds

Prince William Watershed Studies

Occoquan WatershedThe Occoquan Basin: Nearly 40% of Prince William County lands drain directly into the Occoquan Reservoir before flowing to the Potomac River and on to the Chesapeake Bay.

The Occoquan watershed (drainage area) covers 590 square miles and includes the 1,700-acre Occoquan Reservoir, which serves as the boundary between Fairfax and Prince William counties.

The Occoquan Reservoir supplies about 40% of the drinking water supply for 1.2 million Northern Virginia residents and can supply drinking water for the entire region in an emergency.

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