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Stormwater and surface water management
Report a problem
Report a flooding, drainage, or water quality problem in unincorporated King County.
Stormwater services and information
Resources and technical guidance to help manage stormwater.
Surface Water Management fee
Information about the King County Surface Water Management fee, and the current rates and discounts.
Stormwater drainage problems and assistance
Information about assistance that is available to help drainage problems in King County.
Surface Water Design Manual
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.
Stormwater pollution and prevention
Resources for preventing pollution at your home and business.
Stormwater Management Program
Reports, documents, and resources for our Phase 1 Municipal Stormwater National Pollutant Discharge Elimination System (NPDES) Permit.
Capital Services Unit
Projects that protect public health, property, and natural resources from flooding, soil erosion, and drainage problems caused by flooding.
Stormwater glossary of terms
Definitions for words about managing stormwater.