Environmental Rules in Kennewick, WA (2026)
2 verified environmental rules for Kennewick, Washington, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
The City of Kennewick is a regulated small (Phase II) MS4 operator under the Washington State Department of Ecology's Eastern Washington Municipal Stormwater General Permit, issued under RCW 90.48 and 33 USC 1342 (federal Clean Water Act). Local stormwater and illicit-discharge rules are codified in Kennewick Municipal Code Title 14 (KMC Chapter 14.28) and applied to all discharges to the Columbia River, Yakima River, and irrigation district conveyances.
Kennewick Stormwater and MS4 Discharge Rules
Heavy RestrictionsFlood Zones
Kennewick participates in the National Flood Insurance Program and enforces a local Flood Damage Prevention chapter at Kennewick Municipal Code Chapter 18.66, consistent with 44 CFR 60.3 and Washington's Critical Areas requirements under RCW 36.70A.060. FEMA Flood Insurance Rate Maps identify Special Flood Hazard Areas along the Columbia River, Yakima River, and several local drainages, where development requires a floodplain development permit.
Kennewick Flood Zones and NFIP Floodplain Rules
Heavy RestrictionsLooking for Benton County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Kennewick city rules.
Environmental Rules in Benton County →