Report a flooding, drainage, or water quality problem in unincorporated King County.
Resources and technical guidance to help manage stormwater.
Information about the King County Surface Water Management fee, and the current rates and discounts.
Information about assistance that is available to help drainage problems in King County.
Requirements and standards for designing surface and stormwater management systems in King County to mitigate the impacts of new development and redevelopment on natural and existing man-made drainage systems.
Resources for preventing pollution at your home and business.
Reports, documents, and resources for our Phase 1 Municipal Stormwater National Pollutant Discharge Elimination System (NPDES) Permit.
Projects that protect public health, property, and natural resources from flooding, soil erosion, and drainage problems caused by flooding.
Definitions for words about managing stormwater.