Boise enforces stormwater regulations through an MS4 permit with IDEQ. New development and redevelopment disturbing 1 acre or more must submit a Stormwater Pollution Prevention Plan and install permanent post-construction BMPs.
Boise operates a Municipal Separate Storm Sewer System (MS4) permitted by the Idaho Department of Environmental Quality. City Code Title 8 requires construction projects disturbing 1 acre or more (or smaller sites part of a larger plan) to file a SWPPP and implement sediment/erosion controls. Post-construction stormwater quality must be addressed through bioswales, detention ponds, pervious pavement, or similar BMPs. Illicit discharges to storm drains (paint, oil, concrete washwater, pool chlorine) are prohibited. All storm drains in Boise flow to the Boise River untreated, so any pollutant entering a drain reaches the river directly.
Illicit discharge: $500-10,000 per day per state-MS4 permit. Failure to install BMPs: stop work plus fines. Developer liable for downstream damage.
Boise, ID
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Boise, ID
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See how Boise's stormwater management rules stack up against other locations.
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