Environmental Rules in Kent, WA (2026)
4 verified environmental rules for Kent, Washington, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Kent is an NPDES Phase II city and enforces Department of Ecology stormwater standards. New development and redevelopment over 2,000 sf trigger mitigation under the 2019 stormwater manual.
Kent Stormwater Rules
Heavy RestrictionsErosion Control
Kent requires Temporary Erosion and Sediment Control (TESC) plans for construction projects disturbing 7,000 sf or more per state rules. Silt fencing, cover, and stabilized entrances are standard.
Kent Erosion and Sediment Control
Heavy RestrictionsFlood Zones
Kent is a FEMA-participating community with significant Green River and Mill Creek floodplain. New construction in mapped AE zones requires elevation 1 foot above base flood and a floodplain permit.
Kent Flood Zone Rules (Green River and Mill Creek)
Heavy RestrictionsGrading & Drainage
Kent requires a grading permit for most cut or fill over 50 cubic yards under KCC Title 14. Drainage changes must match the DOE Western Washington Stormwater Manual and not harm neighbors.
Kent Grading and Drainage Rules
Heavy RestrictionsLooking for King County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Kent city rules.
Environmental Rules in King County →