Skip to main content
King County logo

What is the purpose of a storm water permit?

Storm water permits are issued by the Washington State Department of Ecology (DOE) and address legal requirements as well as control the discharge of pollutants to protect surface water and ground water quality in Washington State.

What activities require this permit?

Storm water is regulated in Washington State by several types of permits. The permits are designed to control runoff related impacts from various types of sources.

Notes / comments

NPDES (National Pollutant Discharge and Elimination System) Municipal storm water permit and other information is also available at King County stormwater services.


Washington State Department of Ecology Northwest Regional Office
3190 - 160th Ave. SE
Bellevue, Washington 98008-5452
Telephone: 425-649-7000

Legal authority

Chapter 90.48 of the Revised Code of Washington

Administered by

Washington State Department of Ecology

Related links