NPDES Stormwater Permit for Boise-Garden City Area MS4s in Idaho
Transfer of permitting authority to Idaho. As of July 1, 2021, EPA has transferred authority to administer and enforce this permit to the Idaho Department of Environmental Quality. For more information, visit Idaho Pollutant Discharge Elimination System (IPDES) Program.
Below are EPA's National Pollutant Discharge Elimination System (NPDES) municipal separate storm sewer system (MS4) final permit and supporting documents for the following co-permittees in the Boise Urbanized Area:
- Ada County Highway District
- Boise State University
- City of Boise
- City of Garden City
- Drainage District #3
- Idaho Transportation Dept. District #3
Permit expires: September 30, 2026
NPDES Stormwater Permit, Boise-Garden City Area MS4s, #IDS027561 (pdf)
Final stormwater permit.
Appendix B: Annual Report Form, NPDES Permit #IDS027561 (pdf)
Format for annual report to EPA.
NPDES Permit Fact Sheet, Boise-Garden City Area MS4s, #IDS027561 (pdf)
Technical basis for permit.
Response to Comments on Draft NPDES Stormwater Permit, Boise-Garden City Area MS4s, #IDS027561 (pdf)
EPA's responses to public comments on the February 2021 draft permit and Idaho's final water quality certification.