Environmental Rules in Renton, WA (2026)
4 verified environmental rules for Renton, Washington, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Renton Municipal Code 4-6-030 adopts the King County Surface Water Design Manual. Projects creating or replacing 2,000 sq ft of impervious area must manage runoff to protect local waters.
Stormwater Rules in Renton
Heavy RestrictionsErosion Control
Renton requires Temporary Erosion and Sediment Control plans on sites disturbing 7,000 square feet or more. Silt fences, wattles, and stabilized entrances are required per the King County SWDM.
Erosion Control Rules in Renton
Heavy RestrictionsFlood Zones
Renton participates in the NFIP and enforces RMC 4-3-050 floodplain regulations in FEMA Zone AE along the Cedar River and Black River. New construction in the floodplain must meet elevation and floodproofing standards.
Flood Zone Rules in Renton
Heavy RestrictionsGrading & Drainage
Renton Municipal Code 4-8 and the King County SWDM require grading permits for earth-moving over 50 cubic yards and detailed drainage plans to protect the Cedar River, Black River, and downstream habitat.
Grading and Drainage Rules in Renton
Heavy RestrictionsLooking for King County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Renton city rules.
Environmental Rules in King County →