NPDES Stormwater Permit for City of Nampa MS4 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 City of Nampa MS4 in Idaho.

Permit number: IDS028126
Effective date: February 1, 2021
Modified: June 25, 2021
Permit expires: January 31, 2026

NPDES Stormwater Permit, City of Nampa MS4, Idaho, #IDS028126 (pdf) (1.15 MB, June 25, 2021)
Final modified stormwater permit.
Appendix B1: Stormwater Management Program Template, #IDS028126 (pdf) (1012.37 KB)
Optional template for creating or revising Stormwater Management Program (SWMP) document.
Appendix B2: Annual Report Form, #IDS028126 (pdf) (876.2 KB)
Format for annual report. Due no later than April 4 of each year.
NPDES Permit Modification Fact Sheet, City of Nampa MS4, Idaho, #IDS028126 (pdf) (3.58 MB, May 2021)
Technical basis for modification to permit.
NPDES Permit Fact Sheet, City of Nampa MS4, Idaho, #IDS028126 (pdf) (1.18 MB, September 2020)
Technical basis for original permit.
Response to Comments on Draft NPDES Permit for City of Nampa MS4, Idaho, #IDS028126 (pdf) (2.51 MB, December 2020)
EPA's responses to public comments on the September 2020 draft permit.