Stormwater services and information

What is stormwater runoff?

Stormwater resources for business and property owners

Find stormwater resources for businesses and property owners in unincorporated King County.

Technical guidance for stormwater projects

Stormwater permit-related resources and technical guidance.

Stormwater facilities

Information about what stormwater facilities are, types of stormwater facilities, and who maintains them in unincorporated King County.