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Ada County Highway District is responsible for planning, designing and managing efficient traffic flow and traffic safety throughout Ada County. ACHD’s Stormwater Quality staff oversees the National Pollutant Discharge Elimination System (NPDES) permits administered by the Idaho Department of Environmental Quality.

These permits require ACHD to implement programs to protect receiving waters, like the Boise River, from stormwater runoff pollution.

Stormwater Management Programs outline ACHD’s commitment to NPDES compliance and improved water quality through programs for public education and outreach, illicit discharge detection and elimination, erosion and sediment control, stormwater monitoring, investigation and monitoring of dry weather flows, outfall inventory and inspection, and promoting green stormwater infrastructure.

Current ACHD Phase 1 Stormwater Management Plan:

Stormwater Management Plan (PDF)


Do you have stormwater quality questions or concerns? Please give us a call at 208-387-6250.

Stormwater pollution can also be reported via the Storm Water Pollution Hotline - 208-395-8888. A representative will be available 24/7 to take your call. Provide as much information as possible to ensure an appropriate and efficient follow-up response.

For additional information please visit the Stormwater Quality webpage on the Ada County Highway District website.