Gresham, OR Environmental Rules: Stormwater Management (2026)

The council declares its intention to acquire, own, construct, reconstruct, equip, operate, regulate, and maintain within the city limits, and outside the city limits when consistent with the council's adopted policies or intergovernmental agreements, a public stormwater system, and to require persons responsible to construct, reconstruct, maintain, and extend the public stormwater system.

(2) The construction of both the public stormwater system and private stormwater treatment facilities through or adjacent to a new development shall be provided by the person responsible for the development. Improvements shall comply with all applicable city ordinances, policies, and standards, including but not limited to the Public Works Standards, the Oregon Plumbing Specialty Code, and the Stormwater Management Manual that establishes standards and guidelines implementing Best Management Practices designed to meet the objectives and requirements of GRC Articles 3.20 to 3.60. Except as permitted by the manager as provided by the Stormwater Management Manual, required on-site stormwater management facilities for stormwater detention, retention, and water quality treatment shall be located on private properties and shall be owned and maintained by the benefited property.