Executive/Council Action Form (ECAF)
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Ordinance 26-021, relating to regulation of stormwater; amending Chapters 30.63a, 30.63b, Section 30.70.310, and Subtitle 30.91 of the Snohomish County Code (SCC) in response to the County’s 2024 Phase I Municipal Stormwater Permit
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DEPARTMENT: Planning and Development Services
ORIGINATOR: Hilary McGowan, Senior Planner, PDS
EXECUTIVE RECOMMENDATION: Approved by Tom Teigen 5/11/26
PURPOSE: To update Snohomish County Code in accordance with the NPDES permit requirements from the Washington Department of Ecology.
BACKGROUND: This ordinance amends Snohomish County Code (SCC) to update drainage regulations and administrative rules consistent with the 2024 Phase I Municipal Stormwater Permit Issued by the Washington Department of Ecology. The scope of this non-project action is largely dictated by the regulatory update Ecology is requiring the County make, as described in Appendix 10 of the 2024 Phase I Municipal Stormwater Permit and in the 2024 Ecology Stormwater Management Manual for Western Washington (SWMMWW). The changes include the following: Redevelopment thresholds for road related projects, commercial projects, and industrial projects; Project exemptions; Wetland hydroperiod protection method 2; Minimum requirements and definitions related to minimum requirements; Runoff treatment performance foal thresholds and light rail dispersion BMP; Source control BMPs; Bioretention BMP; Stormwater facility maintenance standards; and Started construction standard The following regulations and rules are proposed to be amended to reflect those updates: chapters 30.63A, 30.63B, and 30.91 SCC; SCC 30.70.310; the Snohomish County Drainage Manual; and the Engineering Design and Development Standards (EDDS). In addition, these amendments propose limited, additional updates to chapter 30.63A SCC to address: (1) review processes and appeal procedures for land development projects with drainage components to clarify the County’s procedure; (2) consistency with previously adopted changes in chapter 30.62A SCC; and (3) update reference to Ecology’s SWMMWW.
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OTHER DEPARTMENTAL REVIEW/COMMENTS: Reviewed/approved by Finance - Nathan Kennedy 5/11/26. AATF: Alethea Hart