Idaho NPDES Permits
See the table below for NPDES permits currently issued by EPA in Idaho.
Note: Transfer of permitting authority to Idaho. On June 5, 2018, the EPA approved Idaho's application to administer and enforce the Idaho Pollutant Discharge Elimination System (IPDES) program. To view a schedule for the transfer of permitting authority to Idaho, visit Idaho NPDES Program Authorization. EPA will retain the authority to issue NPDES permits for facilities located on tribal lands and/or discharging to tribal waters.
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 and supporting 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 | 2009-10-15 | 2014-10-14 |
| Aberdeen | Aberdeen Wastewater Treatment Plant | ID0020176 | Final | 2016-03-01 | 2021-02-28 |
| Ahsahka | Ahsahka Water and Sewer District | ID0025224 | Final | 2011-11-01 | 2016-10-31 |
| 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 | General Permits for Aquaculture and Associated Fish Processing Facilities in Idaho | IDG130000 IDG131000 IDG132000 | Final | 2007-12-01 | 2012-11-30 |
| 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) (Ada County, Boise State University, City of Boise, City of Garden City, Drainage District #3, Idaho Transportation Dept. District #3) | IDS027561 | Final | 2012-02-01 | 2018-01-30 |
| 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 | ID0000663 | Final | 2009-06-01 | 2014-05-31 |
| 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 | 2012-05-09 | 2017-05-08 |
| Caldwell | Caldwell Wastewater Treatment Plant | ID0021504 | Final | 2016-11-01 | 2021-10-31 |
| Caldwell | Caldwell MS4 (Stormwater) | IDS028118 | Final | 2009-10-15 | 2014-10-14 |
| Cambridge | Cambridge Wastewater Treatment Facility | ID0021806 | Final | 2005-04-01 | 2010-03-31 |
| Nampa | Canyon Highway District #4 MS4 (Stormwater) | IDS028134 | Final | 2009-10-15 | 2014-10-14 |
| Carey | Carey Wastewater Treatment Facility | ID0025747 | Final | 2018-08-01 | 2023-07-31 |
| Cascade | Cascade Wastewater Treatment Facility | ID0023167 | Final | 2004-01-01 | 2009-12-31 |
| 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 | ID0001163 | Final | 2005-05-01 | 2010-04-30 |
| 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 | 2009-01-01 | 2014-12-31 |
| Cottonwood | Cottonwood Wastewater Treatment Facility | ID0021849 | Final | 2002-10-01 | 2007-09-30 |
| Council | Council Wastewater Treatment Facility | ID0020087 | Final | 05/01/2004 | 2009-04-30 |
| Craigmont | Craigmont Wastewater Treatment Facility | ID0021288 | Final | 04/01/2005 | 2010-03-31 |
| Culdesac | Culdesac Wastewater Treatment Facility | ID0024490 | Final | 10/01/2016 | 2021-09-30 |
| Caldwell | Darigold, Inc. | ID0024953 | Final | 1999-11-02 | 2004-11-02 |
| 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 |
| Shelley | Eastern Idaho Regional Wastewater Authority Oxbow Wastewater Treatment Plant | ID0020133 | Final | 2014-06-01 | 2019-05-31 |
| 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 | Epicenter Aquaculture | ID0028266 | Final | 2007-12-01 | 2012-11-30 |
| 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 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 |
| Boise | Gem Meat Packing | ID0027065 | Final | 1999-11-02 | 2004-11-02 |
| 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 |
| Grangeville | Grangeville Wastewater Treatment Plant | ID0020036 | Final | 2005-10-01 | 2010-09-30 |
| 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 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 Mining Co. Grouse Creek Mine (Current Permit) | ID0026468 | Final | 2002-02-11 | 2007-02-12 |
| Stanley | Hecla Mining Co. Grouse Creek Mine (Proposed Permit) | ID0026468 | Draft | N/A | N/A |
| Mullan | Hecla Mining Co. Lucky Friday Mine | ID0000175 | Final | 2003-09-14 | 2008-09-14 |
| 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 MS4s (Stormwater) | IDS028070 | Final | 2007-05-01 | 2012-04-30 |
| Idaho Falls | Idaho Falls Wastewater Treatment Plant | ID0021261 | Final | 2012-11-01 | 2017-10-31 |
| Coeur d'Alene | Idaho Transportation Dept. District #1 MS4 (Stormwater) | IDS028223 | Final | 2009-01-01 | 2014-12-31 |
| Boise/Nampa | Idaho Transportation Dept. District #3 MS4 (Stormwater) | IDS028177 | Final | 2009-10-15 | 2014-10-14 |
| Twin Falls | Independent Meat Company | ID0000388 | Final | 2016-01-01 | 2019-12-31 |
| Inkom | Inkom Wastewater Treatment Plant | ID0020249 | Final | 2005-06-01 | 2010-05-31 |
| Jerome | Jerome Cheese Company (Current Permit) | ID0027600 | Final | 2001-10-01 | 2006-10-02 |
| Jerome | Jerome Cheese Company (Proposed Permit) | ID0027600 | Draft | N/A | N/A |
| Jerome | Jerome Wastewater Treatment Plant | ID0020168 | Final | 2010-07-01 | 2015-06-30 |
| Lake Fork | Jug Mountain Ranch | ID0028029 | Final | 2004-08-24 | 2009-07-31 |
| 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 |
| Sandpoint | Kootenai-Ponderay Sewer District | ID0021229 | Final | 2018-09-01 | 2023-08-31 |
| Kooskia | Kooskia Wastewater Treatment Plant | ID0021814 | Final | 2002-10-01 | 2007-09-30 |
| Kuna | Kuna Wastewater Treatment Plant | ID0028355 | Final | 2009-06-01 | 2014-05-31 |
| Coeur d'Alene | Lakes Highway District MS4 (Stormwater) | IDS028207 | Final | 2009-01-01 | 2014-12-31 |
| Lapwai | Lapwai Valley Wastewater Treatment Plant | ID0028347 | Final | 2011-08-05 | 2016-07-31 |
| Lava Hot Springs | Lava Hot Springs Wastewater Treatment Plant | ID0021822 | Final | 2005-06-01 | 2010-05-31 |
| Lewiston | Lewiston Wastewater Treatment Plant | ID0022055 | Final | 2016-02-01 | 2021-01-31 |
| Mackay | Mackay Wastewater Treatment Plant | ID0023027 | Final | 2018-06-01 | 2023-05-31 |
| Paul | Magic Valley Produce | ID0026654 | Final | 2003-11-06 | 2008-11-06 |
| Marsing | Marsing Wastewater Treatment Plant | ID0021202 | Final | 2015-11-01 | 2020-10-31 |
| Burley | McCain Foods USA | ID0000612 | Final | 2014-11-01 | 2019-10-31 |
| McCall | McCall Wastewater Treatment Plant | ID0020231 | Final | 2003-05-01 | 2008-04-30 |
| Ketchum | The Meadows LLC | 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 Wastewater Treatment Plant | ID0021831 | Final | 1999-11-02 | 2004-11-02 |
| Middleton | Middleton MS4 (Stormwater) | IDS028100 | Final | 2009-10-15 | 2014-10-14 |
| Montpelier | Montpelier Wastewater Treatment Plant | ID0025585 | Final | 2005-06-01 | 2010-05-31 |
| Moscow | Moscow Wastewater Treatment Plant | ID0021491 | Final | 1999-04-14 | 2004-04-14 |
| Mountain Home | Mountain Home Air Force Base | ID0027642 | Final | 2009-12-01 | 2014-11-30 |
| Mullan | South Fork Coeur d'Alene Sewer District Mullan Wastewater Treatment Plant | ID0021296 | Final | 2013-10-01 | 2018-09-30 |
| Nampa | Nampa Wastewater Treatment Plant | ID0022063 | Final | 2016-11-01 | 2021-10-31 |
| Nampa | Nampa Highway District #1 MS4 (Stormwater) | IDS028142 | Final | 2009-10-15 | 2014-10-14 |
| Nampa | Nampa MS4 (Stormwater) | IDS028126 | Final | 2009-10-15 | 2014-10-14 |
| New Meadows | New Meadows Wastewater Treatment Plant | ID0023159 | Final | 2013-08-01 | 2018-07-31 |
| New Plymouth | New Plymouth Wastewater Treatment Plant | ID0020389 | Final | 2016-09-01 | 2021-08-31 |
| Nezperce | Nezperce Wastewater Treatment Plant (Current Permit) | ID0020397 | Final | 2004-04-01 | 2009-03-31 |
| Nezperce | Nezperce Wastewater Treatment Plant (Proposed Permit) | ID0020397 | Draft | N/A | N/A |
| Cottonwood | North Idaho Correctional Facility | ID0025887 | Final | 2017-09-01 | 2022-08-31 |
| Notus | Notus Wastewater Treatment Plant | ID0021016 | Final | 2013-10-01 | 2018-09-30 |
| Notus/Parma | Notus-Parma Highway District #2 MS4 (Stormwater) | IDS028151 | Final | 2009-10-15 | 2014-10-14 |
| Orofino | Orofino Wastewater Treatment Plant | ID0021050 | Final | 2011-08-01 | 2016-07-31 |
| 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 |
| Shoshone County | South Fork Coeur d'Alene River Sewer District Page Wastewater Treatment Plant | ID0021300 | Final | 2013-10-01 | 2018-09-30 |
| Parma | Parma Wastewater Treatment Plant | ID0021776 | Final | 2017-04-01 | 2022-03-31 |
| Payette | Payette Wastewater Treatment Plant | ID0020672 | Final | 2014-11-01 | 2019-10-31 |
| Pierce | Pierce Wastewater Treatment Plant | ID0020206 | Final | 2018-06-01 | 2023-05-31 |
| Plummer | Plummer Wastewater Treatment Plant | ID0022781 | Final | 2012-07-01 | 2017-06-30 |
| Pocatello | Pocatello Water Pollution Control Facility | ID0021784 | Final | 2012-09-01 | 2017-08-31 |
| Pocatello | Pocatello Area MS4s (Stormwater) (Pocatello, Chubbuck, Bannock County, and Idaho Transportation Dept. District #5) | IDS028053 | Final | 2006-12-15 | 2011-12-14 |
| Post Falls | Post Falls Wastewater Treatment Plant | ID0025852 | Final | 2014-12-01 | 2019-11-30 |
| Post Falls | Post Falls MS4 (Stormwater) | IDS028231 | Final | 2009-01-01 | 2014-12-31 |
| Post Falls | Post Falls Highway District MS4 (Stormwater) | IDS028193 | Final | 2009-01-01 | 2014-12-31 |
| Potlatch | Potlatch Wastewater Treatment Plant | ID0022501 | Final | 2005-04-01 | 2010-10-31 |
| St. Maries | Potlatch Corporation St. Maries Mill | ID0000019 | Final | 1996-10-31 | 2001-10-31 |
| Preston | Preston Wastewater Treatment Plant | ID0020214 | Final | 2017-05-01 | 2022-04-30 |
| Priest River | Priest River Wastewater Treatment Plant | ID0020800 | Final | 2011-12-01 | 2016-11-30 |
| Rexburg | Rexburg Wastewater Treatment Plant | ID0023817 | Final | 2001-09-11 | 2006-09-11 |
| Richfield | Richfield Wastewater Treatment Plant | ID0021211 | Final | 2005-04-01 | 2010-03-31 |
| Ribgy | Rigby Wastewater Treatment Plant | ID0020010 | Final | 2017-01-01 | 2021-12-31 |
| Riggins | Riggins Wastewater Treatment Plant | ID0020931 | Final | 2012-09-01 | 2017-08-31 |
| Ririe | Ririe Wastewater Treatment Plant | ID0026174 | Final | 2004-01-01 | 2009-01-01 |
| Orofino | Riverside Water & Sewer District Wastewater Treatment Plant | ID0024503 | Final | 2011-11-01 | 2016-10-30 |
| Orofino | Riverside Water & Sewer District Water Treatment Plant | ID0021237 | Final | 2017-11-01 | 2022-10-31 |
| Roberts | Roberts Wastewater Treatment Plant | ID0026913 | Final | 2004-05-01 | 2009-04-30 |
| Rockland | Rockland Wastewater Treatment Plant | ID0022047 | Final | 2002-01-07 | 2007-01-08 |
| St. Anthony | St. Anthony Wastewater Treatment Plant | ID0020401 | Final | 2009-12-01 | 2014-11-30 |
| St. Maries | St. Maries Wastewater Treatment Plant | ID0022799 | Final | 2007-10-01 | 2012-09-30 |
| Salmon | Salmon Wastewater Treatment Plant | ID0020001 | Final | 2007-10-01 | 2012-09-30 |
| Sandpoint | Sandpoint Wastewater Treatment Plant (Current Permit) | ID0020842 | Final | 2017-12-01 | 2022-11-30 |
| Fernwood | Santa-Fernwood Sewer District Wastewater Treatment Plant | ID0022845 | Final | 2004-06-01 | 2009-05-31 |
| Shoshone | Shoshone Wastewater Treatment Plant | ID0023728 | Final | 2005-04-01 | 2010-03-31 |
| Various | General Permit for Small Suction Dredge Placer Miners in Idaho | IDG370000 | Final | 2018-06-01 | 2023-05-31 |
| Smelterville | Smelterville Wastewater Treatment Plant | ID0020117 | Final | 2013-10-01 | 2018-09-30 |
| Soda Springs | Soda Springs Wastewater Treatment Plant | ID0020818 | Final | 2001-12-06 | 2006-12-06 |
| Nampa | Sorrento Lactalis, Inc. | ID0028037 | Final | 2018-04-01 | 2023-03-31 |
| Star | Star Sewer and Water District Wastewater Treatment Plant | ID0023591 | Final | 2015-05-01 | 2020-04-30 |
| Tensed | Tensed Wastewater Treatment Plant | ID0025101 | Final | 2004-04-01 | 2009-03-31 |
| Clayton | Thompson Creek Mining Company | ID0025402 | Final | 2002-01-28 | 2007-01-29 |
| Troy | Troy Wastewater Treatment Plant | ID0023604 | Final | 2004-05-01 | 2009-04-30 |
| Twin Falls | Twin Falls Wastewater Treatment Plant | ID0021270 | Final | 2009-11-01 | 2014-10-31 |
| Moscow | University of Idaho Aquaculture Research Laboratory | ID0027154 | Final | 1999-04-14 | 2004-04-14 |
| Wallace | U.S. Silver Corp. Coeur and Galena Mines and Mills | ID0000027 | Final | 2007-07-01 | 2012-06-30 |
| Viola | Viola Water and Sewer District Wastewater Treatment Plant | ID0026310 | Final | 2004-03-15 | 2009-02-28 |
| Weippe | Weippe Wastewater Treatment Plant | ID0020354 | Final | 2014-11-01 | 2019-10-31 |
| Weiser | Weiser Wastewater Treatment Plant | ID0020290 | Final | 2012-01-01 | 2016-12-31 |
| Wilder | Wilder Wastewater Treatment Plant | ID0020265 | Final | 2005-06-01 | 2010-05-31 |
| Winchester | Winchester Wastewater Treatment Plant | ID0020184 | Final | 2013-03-01 | 2018-02-28 |
| 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 (Proposed Permit) | IDG360000 | Draft | N/A | N/A |