Need a SWPPP in King County, WA? King County has about 2,340,211 residents (2024 estimate) and 38 incorporated cities and towns. Describe your project once: stormwater consultants who work in King County get back to you.
Erosion control permits in King County may be issued by the city, the county or a conservation district.
Services available in King County
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SWPPP and permit coverage
Preparation of the SWPPP and notice of intent under the construction general permit.
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Stormwater inspections
Routine and post-storm inspections with reports for the permit.
Frequently asked questions in King County
Do stormwater consultants cover the whole of King County?
Most pros work across the county and neighboring counties. Enter your ZIP code in the form and we match you with pros who serve your exact area.
SWPPP in Washington: all counties
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.