Idaho NPDES Permits
Notice of transfer of permitting authority to Idaho: On June 5, 2018, EPA approved Idaho's application to administer and enforce the Idaho Pollutant Discharge Elimination System (IPDES) Program. EPA will retain authority to issue NPDES permits for facilities located on tribal lands and/or discharging to tribal waters. 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 issued permits and water quality certifications.
Related pages:
- About Region 10's NPDES Permit Program
- Stormwater Program in Region 10
- Pretreatment Program in Region 10
Click on the facility/permit name to view the permit documents.
| Location | Facility or Permit Name | Permit Number | Permit Status | Effective Date | Expiration Date |
|---|---|---|---|---|---|
| Ada County (Boise) | Ada County Highway District MS4 (Stormwater) | IDS028185 | Final | 2021-02-01 | 2026-01-31 |
| Aberdeen | Aberdeen Wastewater Treatment Plant | ID0020176 | Final | 2016-03-01 | 2021-02-28 |
| Ahsahka | Ahsahka Water and Sewer District | ID0025224 | Final | 2021-03-01 | 2026-02-28 |
| Old Town | Albeni Falls Dam | ID0020681 | Final | 2002-01-02 | 2007-01-02 |
| American Falls | American Falls Wastewater Treatment Plant | ID0020753 | Final | 2014-08-01 | 2019-07-31 |
| Various | IDG130000 IDG132000 | Final | 2007-12-01 | 2012-11-30 | |
| Various | 2019 General Permits for Aquaculture Facilities in Idaho (excluding facilities in the Upper Snake-Rock subbasin) | IDG131000 IDG133000 |
Final | 2019-12-01 | 2024-11-30 |
| Nampa | Armour Fresh Meats (ConAgra) | ID0000787 | Final | 1999-02-01 | 2004-02-02 |
| Ashton | Ashton Wastewater Treatment Plant | ID0023710 | Final | 2014-04-01 | 2019-03-31 |
| Eagle | Avimor Water Reclamation Facility | ID0028371 | Final | 2016-05-01 | 2021-04-30 |
| Princeton | Bennett Lumber Products | ID0020532 | Final | 2007-01-01 | 2011-12-31 |
| Blackfoot | Blackfoot Wastewater Treatment Plant | ID0020044 | Final | 2013-09-01 | 2018-08-31 |
| Boise | Boise Lander Street Wastewater Treatment Facility | ID0020443 | Final | 2012-08-01 | 2017-07-31 |
| Boise | Boise West Boise Wastewater Treatment Facility | ID0023981 | Final | 2012-08-01 | 2017-07-31 |
| Boise | Boise Geothermal Project | ID0025488 | Final | 1999-11-16 | 2004-11-16 |
| Boise | Boise-Garden City Area MS4s (Stormwater)(Current Permit) (Ada County, Ada County Drainage District #3, Boise State University, City of Boise, City of Garden City, Idaho Transportation Dept. District #3) | IDS027561 | Final | 2021-10-01 | 2026-09-30 |
| Bonners Ferry | Bonners Ferry Wastewater Treatment Facility | ID0020222 | Final | 2011-11-01 | 2016-10-31 |
| Bovill | Bovill Wastewater Treatment Facility | ID0022861 | Final | 2005-04-01 | 2010-03-31 |
| Buhl | Buhl Wastewater Treatment Facility | ID0020664 | Final | 2007-11-01 | 2012-12-31 |
| Burley | Burley Industrial Wastewater Treatment Plant (Current Permit) | ID0000663 | Final | 2009-06-01 | 2014-05-31 |
| Burley | Burley Industrial Wastewater Treatment Plant (Proposed Draft Permit) | ID0000663 | Draft | N/A | N/A |
| Burley | Burley Wastewater Treatment Plant | ID0020095 | Final | 2018-09-01 | 2023-08-31 |
| Various | General Permit for Concentrated Animal Feeding Operations (CAFOs) in Idaho | IDG010000 | Final | 2020-06-15 | 2025-06-14 |
| Caldwell | Caldwell Wastewater Treatment Plant | ID0021504 | Final | 2016-11-01 | 2021-10-31 |
| Caldwell | Caldwell MS4 | IDS028118 | Final | 2020-12-01 | 2025-09-30 |
| Nampa | Canyon Highway District No. 4 MS4 (Stormwater) | IDS028134 | Final | 2021-02-01 | 2026-01-31 |
| Carey | Carey Wastewater Treatment Facility | ID0025747 | Final | 2018-08-01 | 2023-07-31 |
| Payette | Chiquita Processed Foods | ID0000213 | Final | 2001-12-31 | 2007-01-02 |
| Clarkia | Clarkia Water and Sewer District | ID0025071 | Final | 2011-12-31 | 2016-11-30 |
| Lewiston | Clearwater Paper Corporation (Current Permit) | ID0001163 | Final | 2005-05-01 | 2010-04-30 |
| Lewiston | Clearwater Paper Corporation (Proposed Draft Permit) | ID0001163 | Draft | N/A | N/A |
| Coeur d'Alene | Coeur d'Alene Wastewater Treatment Facility | ID0022853 | Final | 2014-12-01 | 2019-11-30 |
| Coeur d'Alene | Coeur d'Alene MS4 (Stormwater) | IDS028215 | Final | 2020-12-01 | 2025-09-30 |
| Cottonwood | Cottonwood Wastewater Treatment Facility | ID0021849 | Final | 2002-10-01 | 2007-09-30 |
| Craigmont | Craigmont Wastewater Treatment Plant | ID0021288 | Final | 2020-06-01 | 2025-05-31 |
| Culdesac | Culdesac Wastewater Treatment Facility | ID0024490 | Final | 2016-10-01 | 2021-09-30 |
| Caldwell | Darigold, Inc. | ID0024953 | Final | 2019-11-01 | 2024-10-31 |
| Deary | Deary Wastewater Treatment Facility | ID0020788 | Final | 2004-05-01 | 2009-04-30 |
| Dover | Dover Wastewater Treatment Plant | ID0027693 | Final | 2018-08-01 | 2023-07-31 |
| Driggs | Driggs Wastewater Treatment Plant | ID0020141 | Final | 2011-01-01 | 2015-12-31 |
| Ahsahka | Dworshak Reservoir Nutrient Supplementation Pilot Project | ID0028444 | Final | 2011-10-15 | 2016-09-30 |
| Elk City | Elk City Water and Sewer Association | ID0022012 | Final | 2015-05-01 | 2020-04-30 |
| Elk River | Elk River Wastewater Treatment Facility | ID0020362 | Final | 2018-09-01 | 2023-08-31 |
| Pine | Elk Valley Subdivision (Featherville) | ID0027979 | Final | 2005-06-01 | 2010-05-31 |
| Emmett | Emmett Wastewater Treatment Plant | ID0020311 | Final | 2001-12-31 | 2007-01-02 |
| Challis | Garden Creek Farms | ID0028533 | Final | 2018-12-31 | 2023-12-30 |
| Fairfield | Fairfield Wastewater Treatment Facility | ID0024384 | Final | 2015-09-01 | 2020-08-31 |
| Filer | Filer Wastewater Treatment Plant (Current Permit) | ID0020061 | Final | 2007-11-01 | 2012-10-31 |
| Filer | Filer Wastewater Treatment Plant (Proposed Draft Permit) | ID0020061 | Draft | N/A | N/A |
| Firth | Firth Wastewater Treatment Facility | ID0024988 | Final | 2013-04-01 | 2018-03-31 |
| Franklin | Franklin Wastewater Treatment Facility | ID0025569 | Final | 2018-06-01 | 2023-05-31 |
| Fruitland | Fruitland Payette River Wastewater Treatment Plant | ID0021199 | Final | 2011-11-01 | 2016-10-31 |
| Fruitland | Fruitland Snake River Wastewater Treatment Plant | ID0020338 | Final | 2011-11-01 | 2016-10-31 |
| Fruitland | Henggeler Packing Company | ID0027901 | Draft | N/A | N/A |
| Genesee | Genesee Wastewater Treatment Plant | ID0020125 | Final | 2017-07-01 | 2022-06-30 |
| Gooding | Glandbia Foods, Inc. | ID0027120 | Final | 2004-03-01 | 2009-02-28 |
| Glenns Ferry | Glenns Ferry Wastewater Treatment Plant | ID0022004 | Final | 2012-01-01 | 2016-12-31 |
| Gooding | Gooding Wastewater Treatment Plant | ID0020028 | Final | 2000-05-01 | 2005-05-01 |
| Grace | Grace Wastewater Treatment Plant | ID0023825 | Final | 2014-11-01 | 2019-10-31 |
| Greenleaf | Greenleaf Wastewater Treatment Plant | ID0028304 | Final | 2013-01-01 | 2017-12-31 |
| Various | General Permit for Groundwater Remediation Facilities in Idaho | IDG911000 | Final | 2014-09-15 | 2019-09-14 |
| Hagerman | Hagerman Wastewater Treatment Plant (Current Permit) | ID0025941 | Final | 2007-11-01 | 2012-10-31 |
| Hagerman | Hagerman Wastewater Treatment Plant (Proposed Draft Permit) | ID0025941 | Draft | N/A | N/A |
| Hailey | Hailey Wastewater Treatment Plant | ID0020303 | Final | 2012-08-01 | 2017-07-31 |
| Hansen | Hansen Wastewater Treatment Plant | ID0022446 | Final | 2007-11-01 | 2012-10-31 |
| Harrison | Harrison Wastewater Treatment Plant | ID0021997 | Final | 2018-09-01 | 2023-08-31 |
| Hayden | Hayden Area Regional Sewer Board | ID0026590 | Final | 2014-12-01 | 2019-11-30 |
| Stanley | Hecla Limited Grouse Creek Unit | ID0026468 | Final | 2018-12-1 | 2023-11-30 |
| Mullan | Hecla Limited Lucky Friday Mine | ID0000175 | Final | 2019-08-01 | 2024-07-31 |
| Heyburn | Heyburn Wastewater Treatment Plant | ID0020940 | Final | 2002-01-07 | 2007-01-08 |
| Homedale | Homedale Wastewater Treatment Plant | ID0020427 | Final | 2013-10-01 | 2018-09-30 |
| Horseshoe Bend | Horseshoe Bend Wastewater Treatment Plant | ID0021024 | Final | 2018-08-01 | 2023-07-31 |
| Salmon | Idaho Cobalt Project | ID0028321 | Final | 2009-04-01 | 2014-03-31 |
| Leonia | Kootenai River Nutrient Injection Site | ID0028291 | Final | 2006-06-02 | 2011-06-02 |
| Idaho Falls | Idaho Falls and Idaho Transportation Dept. District #6 (ITD6) MS4s (Stormwater) | IDS028070 | Final | 2020-10-01 | 2025-09-30 |
| Idaho Falls | Idaho Falls Wastewater Treatment Plant | ID0021261 | Final | 2012-11-01 | 2017-10-31 |
| Coeur d'Alene | Idaho Transportation Dept. District #1 (ITD1) MS4 (Stormwater) | IDS028223 | Final | 2020-12-01 | 2025-09-30 |
| Lewiston | Idaho Transportation Dept. District #2 (ITD2) MS4 (Stormwater) | IDS028258 | Final | 2020-11-01 | 2025-09-30 |
| Boise/Nampa | Idaho Transportation Dept. District #3 (ITD3) MS4 (Stormwater) | IDS028177 | Final | 2021-02-01 | 2026-01-31 |
| Twin Falls | Independent Meat Company | ID0000388 | Final | 2016-01-01 | 2020-12-31 |
| Inkom | Inkom Wastewater Treatment Plant | ID0020249 | Final | 2005-06-01 | 2010-05-31 |
| Jerome | Jerome Wastewater Treatment Plant | ID0020168 | Final | 2010-07-01 | 2015-06-30 |
| McCall | Jug Mountain Ranch | ID0028029 | Final | 2019-08-01 | 2024-07-31 |
| Juliaetta | Juliaetta Wastewater Treatment Plant | ID0023761 | Final | 2018-08-01 | 2023-07-31 |
| Kamiah | Kamiah Water Treatment Plant | ID0028461 | Final | 2013-01-01 | 2017-12-31 |
| Kendrick | Kendrick Wastewater Treatment Plant | ID0024554 | Final | 2018-09-01 | 2023-08-31 |
| Kamiah | Kamiah Wastewater Treatment Plant | ID0028002 | Final | 2011-08-01 | 2016-12-31 |
| Ketchum | Ketchum Wastewater Treatment Plant | ID0020281 | Final | 2012-08-01 | 2017-07-31 |
| Kooskia | Kooskia Wastewater Treatment Plant | ID0021814 | Final | 2020-01-01 | 2025-12-31 |
| Kuna | Kuna Wastewater Treatment Plant | ID0028355 | Final | 2009-06-01 | 2014-05-31 |
| Kootenai County | North Idaho Highway Districts MS4s (Stormwater)(East Side Highway District, Lakes Highway District, Post Falls Highway District) | IDS02807 | Final | 2020-10-01 | 2025-09-30 |
| Lapwai | Lapwai Regional Wastewater Treatment Plant | ID0028347 | Final | 2019-11-01 | 2024-10-31 |
| Moscow | University of Idaho MS4 (Stormwater) | IDS028576 | Final | 2021-03-01 | 2026-02-28 |
| Lava Hot Springs | Lava Hot Springs Wastewater Treatment Plant | ID0021822 | Final | 2005-06-01 | 2010-05-31 |
| Lewiston | Lewiston and Lewis-Clark State College MS4s (Stormwater) | IDS028061 | Final | 2020-11-01 | 2025-09-30 |
| Paul | Magic Valley Produce | ID0026654 | Final | 2003-11-06 | 2008-11-06 |
| Burley | McCain Foods USA | ID0000612 | Final | 2014-11-01 | 2019-10-31 |
| Ketchum | The Meadows LLC/Mid-Valley Sewer Company | ID0024422 | Final | 2012-08-01 | 2017-07-31 |
| Meridian | Meridian Wastewater Treatment Plant | ID0020192 | Final | 2017-08-01 | 2022-07-31 |
| Leesburg | Meridian Beartrack Mine | ID0027022 | Final | 2003-12-01 | 2008-10-31 |
| Middleton | Middleton MS4 (Stormwater) | IDS028100 | Final | 2020-10-01 | 2025-09-30 |
| Moscow | Moscow MS4 (Stormwater) | IDS028398 | Final | 2019-10-01 | 2024-09-30 |
| Mountain Home | Mountain Home Air Force Base | ID0027642 | Final | 2009-12-01 | 2014-11-30 |
| Nampa | Nampa Highway District #1 MS4 (Stormwater) | IDS028142 | Final | 2009-10-15 | 2014-10-14 |
| Nampa | Nampa MS4 (Stormwater) | IDS028126 | Final | 2020-02-01 | 2026-01-31 |
| Nezperce | Nezperce Wastewater Treatment Plant | ID0020397 | Final | 2019-08-01 | 2024-07-31 |
| Cottonwood | North Idaho Correctional Facility | ID0025887 | Final | 2017-09-01 | 2022-08-31 |
| Notus/Parma | Notus-Parma Highway District #2 MS4 (Stormwater) | IDS028151 | Final | 2009-10-15 | 2014-10-14 |
| Orofino | Orofino Wastewater Treatment Plant | ID0021050 | Final | 2022-02-01 | 2027-01-31 |
| Orofino | Orofino Water Treatment Plant | ID0001058 | Final | 2017-11-01 | 2022-10-31 |
| Idaho Falls | Pacificorp Idaho Falls Pole Yard | ID0026565 | Final | 1996-10-31 | 2001-10-31 |
| Plummer | Plummer Wastewater Treatment Plant | ID0022781 | Final | 2020-09-01 | 2025-08-31 |
| Bannock County | Pocatello Urbanized Area MS4s (Stormwater) (Pocatello, Chubbuck, Bannock County, Idaho Transportation Dept. District #5 (ITD5), Idaho State University) | IDS028053 | Final | 2019-10-01 | 2024-09-30 |
| Post Falls | Post Falls MS4 (Stormwater) | IDS028231 | Final | 2020-11-01 | 2025-09-30 |
| St. Maries | PotlatchDeltic | ID0000019 | Final | 1996-10-31 | 2001-10-31 |
| Orofino | Riverside Water & Sewer District Wastewater Treatment Plant | ID0024503 | Final | 2021-01-01 | 2026-12-31 |
| Orofino | Riverside Water & Sewer District Water Treatment Plant | ID0021237 | Final | 2017-11-01 | 2022-10-31 |
| St. Maries | St. Maries Wastewater Treatment Plant | ID0022799 | Final | 2020-11-01 | 2025-10-31 |
| Various | General Permit for Small Suction Dredge Placer Miners in Idaho | IDG370000 | Final | 2018-06-01 | 2023-05-31 |
| Nampa | Sorrento Lactalis, Inc. | ID0028037 | Final | 2018-04-01 | 2023-03-31 |
| Tensed | Tensed Wastewater Treatment Plant | ID0025101 | Final | 2020-10-01 | 2025-09-30 |
| Clayton | Thompson Creek Mining Company | ID0025402 | Final | 2002-01-28 | 2007-01-29 |
| Moscow | University of Idaho Aquaculture Research Laboratory | ID0027154 | Final | 1999-04-14 | 2004-04-14 |
| Winchester | Winchester Wastewater Treatment Plant | ID0020184 | Final | 2020-10-01 | 2025-09-30 |
| Worley | Worley Wastewater Treatment Plant | ID0022713 | Final | 2015-05-01 | 2020-04-30 |
| Various | General Permit for Idaho Drinking Water Facilities | IDG380000 | Final | 2016-11-01 | 2021-01-31 |
| Various | General Permit for Hydroelectric Generating Facilities in Idaho | IDG360000 | Draft | N/A | N/A |