NPDES Stormwater Permit for City of Middleton 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 Middleton, Idaho, within the Nampa Urbanized Area.

Permit number: IDS028100
Effective date: October 1, 2020
Permit expires: September 30, 2025

NPDES Stormwater Permit, City of Middleton MS4, Idaho, #IDS028100 (pdf) (639.13 KB, September 10, 2020)
Final stormwater permit.
NPDES Permit Fact Sheet, City of Middleton MS4, Idaho, #IDS028100 (pdf) (1010.26 KB, July 2020)
Technical basis for permit.
Appendix B1: Stormwater Management Program Template, #IDS028100 (pdf) (965.21 KB)
Optional template for creating or revising Stormwater Management Program (SWMP) document.
Appendix B2: Annual Report Form, #IDS028100 (pdf) (747.98 KB)
Format for annual report. Due no later than December 1 of each year.