Stormwater Code and Manual Update 2026 - Background

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Background

The Department of Ecology requires that Seattle updates our current codes with additional stormwater control regulations as a condition of our  2024 National Pollutant Discharge Elimination System (NPDES) Phase 1 Municipal Stormwater Permit (Ecology NPDES Permit). To meet these requirements, we are revising our existing Stormwater Code (SMC 22.800-22.808) and the associated Stormwater Manual (Directors' Rule 10-2021). These new rules will replace the current drainage control code and Directors' Rules which are administered jointly by SDCI and SPU. 

Construction and Inspections

Kye Lee, Interim Director
Address: 700 5th Ave, Suite 2000, Seattle, WA, 98104
Mailing Address: P.O. Box 34019, Seattle, WA, 98124-4019
Phone: (206) 684-8600
Phone Alt: Violation Complaint Line: (206) 615-0808
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SDCI issues land use, construction, and trade permits, conducts construction and housing-related inspections, ensures compliance with our codes, and regulates rental rules. SDCI is committed to an antiracist workplace and to addressing racism through our work in the community.