Wyandotte County, KS Environmental Rules: Stormwater Management (2026)

Article XV of Chapter 8 implements the unified government's federal Clean Water Act obligations as an operator of a municipal separate storm sewer system (MS4) under its Kansas Water Pollution Control General MS4 Permit. Section 8-630 requires that persons undertaking development or redevelopment of land located within the limits of the City of Kansas City, Kansas shall provide stormwater treatment as provided in the article, and separately requires owners of any private stormwater treatment facility to register it with the county engineer, inspect and maintain it, and report on those activities.

Section 8-632 puts the county engineer in charge of adopting and updating the technical stormwater treatment standards, covering post-construction treatment design, facility inspection and maintenance schedules, and the required facility registry; the engineer may demand additional controls beyond the minimum where hydrologic or topographic conditions warrant it, and failing to meet those added requirements is itself unlawful. Non-structural practices are encouraged over structural ones, but any non-structural approach must be locked in through a drainage easement, dedicated tract, or similar recorded instrument so it survives a change in ownership.

Enforcement mirrors the county's erosion-control program: Section 8-642 authorizes injunctive relief through the chief counsel, civil penalties up to $1,000.00 per violation with each recurring day a separate violation, recovery of attorney's fees, court costs, and environmental damages, and criminal prosecution as a class A violation for intentional, harmful, or repeat violations, including falsified monitoring records.