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  2. NPDES Permits Around the Nation

Idaho NPDES Permits

In Idaho, EPA issues NPDES permits for facilities on tribal lands and/or discharging to tribal waters. On June 5, 2018, EPA approved Idaho's application to administer the Idaho Pollutant Discharge Elimination System program to issue other NPDES permits in Idaho. For more information, visit Idaho NPDES Program Authorization.

For EPA-issued permits in Idaho, see the table below.

For state-issued permits, visit Idaho Dept. of Environmental Quality Permits and Water Quality Certifications.

Related pages:
  • About Region 10's NPDES Permit Program

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There are no current public comment opportunities.


Click on the facility/permit name to view permit documents.

NPDES Permits Issued in Idaho
Location Facility or Permit Name Permit Number Effective Date Expiration Date
Ahsahka Ahsahka Water and Sewer District ID0025224 2021-03-01 2026-02-28
Various 2019 General Permits for Aquaculture Facilities in Idaho (excluding facilities in the Upper Snake-Rock subbasin) IDG131000
IDG133000
2019-12-01 2024-11-30
Various General Permit for Concentrated Animal Feeding Operations (CAFOs) in Idaho [PERMIT TRANSFERRED TO IDAHO DEPT OF ENVIRONMENTAL QUALITY] IDG010000 2020-06-15 2025-06-14
Craigmont Craigmont Wastewater Treatment Plant ID0021288 2020-06-01 2025-05-31
Culdesac Culdesac Wastewater Treatment Facility ID0024490 2023-10-01 2028-09-30
Ahsahka Dworshak Dam ID0028586 2024-04-01 2029-03-31
Kamiah Kamiah Water Treatment Plant ID0028461 2013-01-01 2017-12-31
Kamiah Kamiah Wastewater Treatment Plant ID0028002 2023-06-01 2028-05-31
Kooskia Kooskia Wastewater Treatment Plant ID0021814 2020-01-01 2025-12-31
Lapwai Lapwai Regional Wastewater Treatment Plant ID0028347 2019-11-01 2024-10-31
Nezperce Nezperce Wastewater Treatment Plant ID0020397 2019-08-01 2024-07-31
Orofino Orofino Wastewater Treatment Plant  ID0021050 2022-02-01 2027-01-31
Orofino Orofino Water Treatment Plant ID0001058 2017-11-01 2022-10-31
Plummer Plummer Wastewater Treatment Plant ID0022781 2020-09-01 2025-08-31
St. Maries PotlatchDeltic ID0000019 2022-09-01 2027-08-31
Orofino Riverside Water & Sewer District Wastewater Treatment Plant  ID0024503 2022-01-01 2026-12-31
Orofino Riverside Water & Sewer District Water Treatment Plant ID0021237 2017-11-01 2022-10-31
St. Maries St. Maries Wastewater Treatment Plant ID0022799 2020-11-01 2025-10-31
Tensed Tensed Wastewater Treatment Plant ID0025101 2020-10-01 2025-09-30
Winchester Winchester Wastewater Treatment Plant ID0020184 2020-10-01 2025-09-30
Worley Worley Wastewater Treatment Plant ID0022713 2023-07-01 2028-06-30
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Last updated on May 16, 2025
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