Spokane requires erosion and sediment control plans for any land-disturbing activity over 500 sq ft under SMC 17D.060. Construction sites use silt fences, straw wattles, and inlet protection per the Spokane Regional Stormwater Manual. DOE CSWGP covers 1+ acre sites.
Spokane Municipal Code 17D.060 and the Spokane Regional Stormwater Manual require erosion and sediment control (ESC) plans for land disturbance exceeding 500 square feet. Typical BMPs include silt fences along downhill edges, stabilized construction entrances (rock pads), inlet protection at all storm drain catch basins, straw wattles on slopes, and temporary stabilization via hydroseed or mulch within 7 days of inactivity. Projects disturbing one acre or more must obtain a Washington Department of Ecology Construction Stormwater General Permit (CSWGP) with weekly inspections and turbidity monitoring. Winter construction (November-March) triggers enhanced ESC requirements. Failure to maintain BMPs can lead to stop-work orders and sediment cleanup costs.
ESC failures: stop-work order, fines $500-$10,000 depending on discharge. DOE CSWGP violations: up to $10,000/day.
Spokane, WA
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