The WA Department of Ecology requires construction projects over 1 acre to obtain coverage under the Construction Stormwater General Permit (CSGP), but there are thousands of sites that go unregulated at a state level and are subject to local requirements.  These small, less than 1 acre, sites can cause huge impacts to our waterways.

Stormwater runoff from construction sites can carry muddy water, debris, and chemicals such as vehicle fluids into local waterways. These pollutants harm aquatic life and increase the potential for urban flooding from stormwater systems being clogged by sediment.