Troutdale, OR Environmental Rules: Stormwater Management (2026)

The City of Troutdale is a regulated small MS4 (Municipal Separate Storm Sewer System) operator under Oregon DEQ's NPDES Phase II General Permit. Local stormwater rules sit in two TMC chapters: Chapter 12.06 (Storm Sewer System), which establishes the city's storm sewer, connection rules, illicit-discharge prohibitions, and enforcement; and Chapter 12.09 (Erosion Control), which governs construction-site erosion and sediment control. The system includes pipes, detention basins, drywells, culverts, creeks, and storm drain inlets; runoff is partially treated before discharge to groundwater or to surface waters, primarily the Sandy River and Columbia River, both of which carry threatened and endangered salmonid populations. Common illicit discharges that the program prohibits and responds to include vehicle wash water, paint, motor oil, sediment from construction, pet waste, yard waste, and chemicals dumped or washed into storm drain inlets — anything other than uncontaminated rainwater. Public Works' Environmental Specialist (Ryan Largura) and the Stormwater Services Division administer the program and respond to spills and releases; residents can report illicit discharges via the city's online survey or by calling Public Works at 503-674-3300 (business hours) or the after-hours emergency line at 503-251-4163. Construction-phase erosion control is required under Chapter 12.09 in coordination with Oregon DEQ's 1200-C General Permit for sites disturbing 1 acre or more.