Portland's Bureau of Environmental Services (BES) enforces comprehensive stormwater management under City Code Title 17 (Public Improvements) and the Stormwater Management Manual (SWMM). All new development and redevelopment creating 500 square feet or more of impervious surface must manage stormwater on-site. Portland holds an MS4 NPDES permit from Oregon DEQ requiring pollutant reduction in all stormwater discharges.
The SWMM requires pollution reduction, flow control, and infiltration for qualifying projects. Green infrastructure such as bioswales, ecoroofs, and rain gardens is strongly encouraged. BES charges stormwater utility fees based on impervious area. The Clean River Rewards program offers up to 100% discount on stormwater fees for properties managing runoff on-site. All construction sites must implement erosion and sediment control per Title 10.
Illicit discharges to the stormwater system carry civil penalties up to $10,000 per day per violation under Portland City Code 17.39. BES can issue stop-work orders and require corrective action. Failure to maintain required stormwater facilities may result in liens on the property.
Portland, OR
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Side-by-side rule comparisons with other cities in Multnomah County.
See how other cities in Multnomah County handle stormwater management.
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