King County is currently in Phase 2 of reopening.

Information for Shoreline

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Drainage and Flooding

The Utility maintains and improves storm water infrastructure in order to prevent flooding. Find out how to assess drainage and flooding issues on your property.

Studies and Plans

The Utility has compiled research into the current status of the surface water drainage system and made plans as to how to best manage the system. Find more information about:

  • 2011-2016 Surface Water Master Plan
  • Watershed-specific reports and plans
  • Water quality reports

NPDES Permit

The Utility has a mandate from the Environmental Protection Agency and the Washington State Department of Ecology to reduce pollution in its stormwater drainage system. Find out more information about this permit here. 

Drainage Maps

View maps of the surface water drainage system including both piped and natural watercourses.