Idaho NPDES Permits
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.
See the table below for NPDES permits currently issued in Idaho.
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 (Current Permits) | IDG130000 IDG131000 IDG132000 | Final | 2007-12-01 | 2012-11-30 |
| Various | General Permits for Aquaculture Facilities in Idaho (Proposed Permits) | IDG131000 IDG133000 |
Draft | N/A | N/A |
| 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 (Current Permit) | ID0000663 | Final | 2009-06-01 | 2014-05-31 |
| Burley | Burley Industrial Wastewater Treatment Plant (Proposed 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 | 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 (Current Permit) | ID0001163 | Final | 2005-05-01 | 2010-04-30 |
| Lewiston | Clearwater Paper Corporation (Proposed 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 | 2009-01-01 | 2014-12-31 |
| Coeur d'Alene | East Side Highway District MS4 (Stormwater) | IDS028207 | Draft | N/A | N/A |
| Cottonwood | Cottonwood Wastewater Treatment Facility | ID0021849 | Final | 2002-10-01 | 2007-09-30 |
| Council | Council Wastewater Treatment Facility | ID0020087 | Final | 2004-05-01 | 2009-04-30 |
| Craigmont | Craigmont Wastewater Treatment Facility | ID0021288 | Final | 2005-04-01 | 2010-03-31 |
| 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 |
| 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 |
| 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 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 |
| 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 (Current Permit) | ID0021997 | Final | 2018-09-01 | 2023-08-31 |
| Harrison | Harrison Wastewater Treatment Plant (Proposed Permit Modification) | ID0021997 | Draft | N/A | N/A |
| 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 (Current Permit) | ID0000175 | Final | 2003-09-14 | 2008-09-14 |
| Mullan | Hecla Limited Lucky Friday Mine (Proposed Permit) | ID0000175 | Draft | N/A | N/A |
| 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 |
| Lewiston | Idaho Transportation Dept. District #2 MS4 (Stormwater) | IDS028258 | Draft | N/A | N/A |
| 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 | 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 (Current Permit) | ID0028029 | Final | 2004-08-24 | 2009-07-31 |
| McCall | Jug Mountain Ranch (Proposed Permit) | ID0028029 | Draft | N/A | N/A |
| 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 |
| Hayden | Lakes Highway District MS4 (Stormwater)(Current Permit) | IDS028207 | Final | 2009-01-01 | 2014-12-31 |
| Hayden | Lakes Highway District MS4 (Stormwater)(Proposed Permit) | IDS028207 | Draft | N/A | N/A |
| Lapwai | Lapwai Regional Wastewater Treatment Plant (Current Permit) | ID0028347 | Final | 2011-08-05 | 2016-07-31 |
| Lapwai | Lapwai Regional Wastewater Treatment Plant (Proposed Permit) | ID0028347 | Draft | N/A | N/A |
| 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 |
| Lewiston | Lewiston and Lewis-Clark State College MS4 (Stormwater) | IDS028061 | Draft | N/A | N/A |
| 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/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 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 |
| Moscow | Moscow MS4 (Stormwater) | IDS028398 | Draft | N/A | N/A |
| 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 |
| Bannock County | Pocatello Urbanized Area MS4s (Stormwater) (Pocatello, Chubbuck, Bannock County, Idaho Transportation Dept. District #5, Idaho State University) | IDS028053 | Final | 2019-10-01 | 2024-09-30 |
| 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)(Proposed Permit) | IDS028207 | Draft | N/A | N/A |
| Post Falls | Post Falls Highway District MS4 (Stormwater)(Current Permit) | 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 Idaho Inc. Coeur and Galena Mines and Mills (Current Permit) | ID0000027 | Final | 2007-07-01 | 2012-06-30 |
| Wallace | U.S. Silver Idaho Inc. Coeur and Galena Mines and Mills (Proposed Permit) | ID0000027 | Draft | N/A | N/A |
| 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 |