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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 issued by the EPA.

These permits require ACHD to implement programs to ensure water flowing off the roads and through the storm drain system is cleaned before entering receiving waters, like the Boise River.

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.

Download the Current ACHD Phase 1 Stormwater Management Plan (PDF)


Monica Lowe, Stormwater Quality Coordinator


Andrew Ramsey, Stormwater Quality Specialist, Erosion and Sediment Control