NPDES discharge permits — WY
436 active individual permits with limits in EPA's file of 2026-09-19.
- 3 Creek Ranch WY0052094
- A.O. Bullock WY0097020
- ATR Energy Corp. WY0096971
- AX MHC SNAKE RIVER LLC WY0095320
- Aethon Energy Operating LLC WY0002062
- Alpha Energy LLC WY0025780
- Alpine, Town of WY0035611
- Amplify Energy Operating LLC WY0094803
- Anadarko E&P Onshore, LLC WY0044164
- Anschutz Exploration Corporation WY0097031
- Antler Energy, LLC WY0028231
- Antler Energy, LLC WY0034070
- Arnell Oil Company WY0024368
- Arnell Oil Company WY0024376
- Astoria Park Conservancy WY0096440
- Aud & Di Campground Services, Inc. WY0095613
- B&B Aggregates WY0095711
- BL Property LLC, dba Brooks Lake Lodge WY0028045
- Bareto Energy, LLC WY0000353
- Bareto Energy, LLC WY0026816
- Bareto Energy, LLC WY0026867
- Bareto Energy, LLC WY0027731
- Bareto Energy, LLC WY0031739
- Bareto Energy, LLC WY0032051
- Barn Owls, LLC WY0095753
- Barn Owls, LLC WY0095761
- Barn Owls, LLC WY0095869
- Barn Owls, LLC WY0096296
- Basin, Town of WY0020028
- Bataa Oil, Inc WY0095915
- Bataa Oil, Inc. WY0022578
- Bataa Oil, Inc. WY0040151
- Bear River, Town of WY0031712
- Bentonite Performance Minerals, LLC WY0096563
- Beren Corporation WY0026611
- Beren Corporation WY0028126
- Berenergy Corporation WY0097013
- Berenergy Corporation WY0097024
- Big Muddy Operating, LLC WY0000710
- Big Muddy Operating, LLC WY0000914
- Big Piney, Town of WY0020133
- Bighorn Resort Holdings LLC WY0096938
- Bitterroot Energy Partners LLC WY0096911
- Black Bear Oil Corporation WY0000744
- Black Bear Oil Corporation WY0024503
- Black Bear Oil Corporation WY0024864
- Black Bear Oil Corporation WY0031305
- Black Butte Coal Company WY0096857
- Black Gold Services Inc WY0001473
- Black Hills Corporation WY0097001
- Black Hills Energy WY0096784
- Black Thunder Oil WY0033383
- Black Thunder Oil LLC WY0096822
- Black Thunder Oil LLC WY0096831
- BreitBurn Operating, LP WY0000761
- BreitBurn Operating, LP WY0001031
- BreitBurn Operating, LP WY0001490
- BreitBurn Operating, LP WY0002437
- BreitBurn Operating, LP WY0020265
- Breitburn Operating, LP WY0000973
- Bridger Coal Company WY0030350
- Buckskin Mining Company WY0028479
- Buffalo, Town of WY0021024
- Burlington, Town of WY0096512
- Burns, Town of WY0021652
- Byron, Town of WY0020281
- CV Laramie MHP, LLC WY0021954
- Carbon Creek Energy, LLC WY0048321
- Carbon Creek Energy, LLC WY0048381
- Carbon Creek Energy, LLC WY0049158
- Carbon Creek Energy, LLC WY0049344
- Carbon Creek Energy, LLC WY0049697
- Carbon Creek Energy, LLC WY0049999
- Carbon Creek Energy, LLC WY0050865
- Carbon Creek Energy, LLC WY0051276
- Carbon Creek Energy, LLC WY0051446
- Carbon Creek Energy, LLC WY0051713
- Carbon Creek Energy, LLC WY0051837
- Carbon Creek Energy, LLC WY0051918
- Carbon Creek Energy, LLC WY0052124
- Carbon Creek Energy, LLC WY0052221
- Carbon Creek Energy, LLC WY0052299
- Carbon Creek Energy, LLC WY0052426
- Carbon Creek Energy, LLC WY0052817
- Carbon Creek Energy, LLC WY0052833
- Carbon Creek Energy, LLC WY0054151
- Carbon Creek Energy, LLC WY0054593
- Carbon Creek Energy, LLC WY0055514
- Carbon Creek Energy, LLC WY0055590
- Carbon Creek Energy, LLC WY0055638
- Carbon Creek Energy, LLC WY0056081
- Carbon Creek Energy, LLC WY0056529
- Carbon Creek Energy, LLC WY0094609
- Carbon Creek Energy, LLC WY0095087
- Carbon Creek Energy, LLC WY0095541
- Cardinal Wyoming LLC WY0035521
- Carl D. Underwood Oil & Gas WY0027367
- Carol-Holly Oil Corporation WY0025283
- Carol-Holly Oil Corporation WY0027308
- Carol-Holly Oil Corporation WY0035726
- Casper, City of WY0021920 · major
- Central Wyoming Regional Water System WY0097018
- Chemtrade Logistics WY0034207
- Chevron Environmental Management Company WY0036412
- Cheyenne Board of Public Utilities WY0022381 · major
- Cheyenne Board of Public Utilities WY0022934 · major
- Cheyenne Board of Public Utilities WY0031721
- Cheyenne Regional Airport WYS000020
- Cheyenne Renewable Diesel Company LLC. WY0000442 · major
- Chipcore, LLC WY0023507
- Chipcore, LLC WY0047295
- Citation Oil and Gas Corporation WY0001171
- Citation Oil and Gas Corporation WY0001481
- Citation Oil and Gas Corporation WY0001503
- Citation Oil and Gas Corporation WY0002402
- Citation Oil and Gas Corporation WY0020508
- Citation Oil and Gas Corporation WY0022454
- Citation Oil and Gas Corporation WY0023914
- City of Douglas WY0020109
- City of Evanston WY0020095 · major
- City of Green River WY0020443 · major
- City of Torrington WY0020231 · major
- Cline Production Company WY0097007
- Cloud Peak Operating LLC WY0094439
- Cody Energy, Inc. WY0094013
- Cody, City of WY0020451
- Cokeville, Town of WY0021032
- Contango Resources, INC WY0020699
- Contango Resources, INC WY0022829
- Contango Resources, INC WY0022837
- Contango Resources, INC WY0024414
- Contango Resources, INC WY0031704
- Contango Resources, INC WY0032859
- Contango Resources, INC WY0033120
- Contango Resources, INC WY0033138
- Contango Resources, INC WY0036617
- Contango Resources, LLC WY0000868
- Contango Resources, LLC WY0002445
- Contango Resources, LLC WY0036196
- Cowboy Clean Fuels, LLC WY0049204
- Cowboy Clean Fuels, LLC WY0053821
- Cowboy Clean Fuels, LLC WY0056839
- D90 ENERGY LLC WY0000281
- D90 Energy LLC WY0000264
- Dayton, Town of WY0020435
- Deaver, Town of WY0021580
- Denbury Onshore, LLC WY0000256
- Denbury Onshore, LLC WY0002194
- Denbury Onshore, LLC WY0036064
- Diamond Oil & Gas WY0096946
- Dixon, Town of WY0021938
- Double L LLC WY0097012
- Douglas, Town of WY0056006
- Dubois, Town of WY0020834
- E & B Natural Resources Management Corporation WY0095125
- E & B Natural Resources Management Corporation WY0096229
- Eagle Specialty Materials, LLC WY0003514
- Eagle Specialty Materials, LLC WY0026018
- Ellbogen, John P., LTD WY0025470
- Ellwood Exploration, LLC WY0096181
- Encampment, Town of WY0020591
- Encampment, Town of WY0035980
- Energy Equity Company WY0032760
- Energy Fuels Resources (USA), Inc. WY0095702
- Enterprise Products Operating, LP WY0056499
- Evans Construction Company WY0097034
- Everest Oil & Gas, LLC WY0096351
- Flying J Petroleums, Inc WY0000451
- Fort Bridger Sewer District WY0022071
- Gillette, City of WY0020125 · major
- Glenrock, Town of WY0020630
- Gold King Corp WY0097003
- Gorman Construction, LLC WY0036234
- Grand Targhee Resort (GT Acquisitions I, LLC) WY0024708
- Grand Teton Park, LLC WY0096890
- Granite Creek Energy, LLC WY0097027
- Granite Creek Operating LLC WY0002984
- Granite Creek Operating LLC WY0003140
- Granite Creek Operating LLC WY0023248
- Green Reserve Energy Holdings, LLC WY0028274
- Green River Rock Springs Sweetwater County JPWB WY0000027
- Greybull, Town of WY0020583
- Guernsey, Town of WY0021831
- H2Oil Services LLC WY0097022
- Hadley Jackson Oil WY0096407
- Hadley/Jackson Energy, LLC WY0096211
- Hanna, Town of WY0020745
- Hartville, Town of WY0021440
- Hilcorp Energy Company WY0032697
- Homeowner WY0097025
- Homer Dean Oil Company WY0096954
- Hoy, Philip WY0048488
- Hudson, Town of WY0020664
- Impact Energy Operating, LLC WY0034142
- Impact Energy Operating, LLC WY0094391
- Indian Creek Resources, Inc. WY0096113
- Iron Creek Properties, Inc. WY0023566
- J & J Production WY0001619
- JP Oil Company WY0001864
- JP Oil Company WY0028002
- JTL Group Inc. dba Knife River WY0096199
- Jackson National Fish Hatchery WY0097021
- Jackson, Town of WY0021458 · major
- Jackson, Town of WY0049484
- JoeMar Wyoming Operating LLC WY0056375
- Kaycee, Town of WY0021733
- Kemmerer Operations, LLC WY0000051
- Kemmerer-Diamondville Joint Powers Board WY0000116
- Kemmerer-Diamondville Joint Powers Board WY0020320 · major
- Kennecott Uranium Company WY0025950 · major
- LaBarge, Town of WY0022080
- Lander, City of WY0020389 · major
- Laramie, City of WY0022209 · major
- Loil Oil LLC dba Loil Energy Partners WY0096865
- Loil Oil, LLC DBA Loil Energy Partners WY0000663
- Loil Oil, LLC DBA Loil Energy Partners WY0024716
- LoneHart, LLC WY0056111
- Lost Creek ISR, LLC WY0097006
- Lovell, Town of WY0020061
- Lyman, Town of WY0020117
- M & K Oil Company, LLC WY0002593
- M&K Oil Company, LLC WY0001643
- M&K Oil Company, LLC WY0032832
- M&K Oil Company, LLC WY0033596
- M&K Oil Company, LLC WY0034169
- M&K Oil Company, LLC WY0035599
- M&K Oil Company, LLC WY0036439
- M2S Oil LLC WY0001627
- M2S Oil, LLC WY0026859
- MEGA Energy, LLC WY0096491
- Manderson, Town of WY0052442
- Marbleton, Town of WY0021997
- Martin Marietta Materials, Inc. WY0032492
- Martin Marietta Materials, Inc. WY0034266
- Maxim Drilling and Exploration, Inc. WY0053724
- Maximus Operating, Ltd. WY0096999
- McMurry Ready Mix WY0094170
- Meadow Park Village Homeowners Association WY0031348
- Meerkat Logistics & Operations, LLC WY0025887
- Meeteetse, Town of WY0020044
- Meeteetse, Town of WY0046175
- Merit Energy Company WY0000175
- Merit Energy Company WY0000680
- Merit Energy Company WY0001732
- Merit Energy Company WY0001759
- Merit Energy Company WY0001899
- Merit Energy Company WY0001902
- Merit Energy Company WY0001911
- Merit Energy Company WY0022900
- Merit Energy Company WY0024261
- Merit Energy Company WY0026590
- Merit Energy Company WY0027197
- Merit Energy Company WY0036421
- Merit Energy Company WY0096415
- Merit Energy Company-Chatterton Battery WY0000922
- Merit Energy Company-Maverick Springs Battery WY0000779
- Mid-Con Energy Operating, LLC WY0097040
- Moorcroft, Town of WY0021741
- Mountain Cement Company LLC WY0097037
- Mountain View, Town of WY0022896
- Mullinax Concrete Service Co., Inc. WY0096041
- Mullinax Inc. WY0095079
- Mullinax Inc. WY0095851
- NEPECO WY0030589
- National Park Service WY0023442
- Navajo Transitional Energy Company, LLC WY0023761
- Navajo Transitional Energy Company, LLC WY0030198
- Navajo Transitional Energy Company, LLC WY0096288
- New Era Petroleum WY0032565
- Newcastle, City of WY0096610
- Northeast Wyoming Regional Airport WY0032522
- O'Brien Energy Resources WY0054241
- ONEOK Rockies Midstream WY0097008
- Oil Mountain Energy, Inc. WY0096989
- Osage Partners LLC WY0003221
- Osage Partners, LLC WY0003298
- Osage Partners, LLC WY0003301
- Osage Partners, LLC WY0026719
- Ott, Inc. WY0056359
- PDS Resources LLC WY0024023
- PDS Resources, LLC WY0096571
- POC-1, LLC WY0026701
- POC-I, LLC WY0001414
- POC-I, LLC WY0003051
- POC-I, LLC WY0095681
- Pacificorp WY0003115 · major
- Pacificorp/Naughton Plant WY0020311
- Pathfinder Mines Corp. WY0096466
- Peabody Caballo Mining, LLC WY0024031
- Peabody Caballo Mining, LLC WY0025755
- Peabody Powder River Mining, LLC WY0028177
- Petroleum Resource Management WY0031461
- Petrox Resources, Inc. WY0094510
- Phillips 66 Company WY0030481
- Phillips 66 Company WY0035777
- Phoenix Production Sheldon Dome WY0024953
- Pilot Company WY0033944
- Pilot Company WY0035700
- Pilot Company WY0041084
- Pilot Travel Centers LLC WY0096580
- Pine Bluffs, Town of WY0032212
- Pine Haven Resources, LLC WY0001198
- Pine Haven Resources, LLC WY0033065
- Pine Haven Resources, LLC WY0034151
- Pine Haven, Town of WY0095907
- Pinedale, Town of WY0020656
- Powder Horn Ranch, LLC WY0036251
- Powell, City of WY0020648 · major
- Principle Petroleum LLC WY0095559
- Providence Oil Development LLC WY0096539
- RIM Operating, Inc. WY0097002
- Rael Resources LLC WY0097009
- Ranch Oil Company WY0000299
- Ranch Oil Company WY0034193
- Ranchester, Town of WY0022161
- Rawlins, City of WY0020427 · major
- Red Tiger Oil and Gas, LLC WY0026310
- Red Tiger Oil and Gas, LLC WY0096881
- Regency of Wyoming, Inc. WY0022128
- Remediation Management Services Company WY0048810
- Richardson Operating Company WY0027316
- Richardson Operating Company WY0035840
- Riverside, Town of WY0032662
- Riverton, City of WY0020672 · major
- Rock River, Town of WY0035041
- Rock Springs, City of WY0022357 · major
- Russell Construction Company WY0096792
- SEP - Pass Creek, LLC WY0096750
- SHADCO WY0025011
- Saratoga, Town of WY0021491
- Seedy Draw LLC WY0034673
- Sheridan County School District #1 WY0056308
- Sheridan, City of WY0001392
- Sheridan, City of WY0020010 · major
- Sheridan, City of WY0035661
- Shoshone Municipal Pipeline WY0035629
- Silver Eagle Refining, Inc. WYS000014
- Simon Oil WY0025071
- Simon Oil WY0095877
- Simon Oil LLC WY0095532
- Sinclair, Town of WY0020397
- Six Bar Oil, LLC WY0024741
- Six Bar Oil, LLC WY0024759
- Six Bar Oil, LLC WY0097026
- Skinner Oil and Gas, LLC WY0097028
- Slate Refining, LLC WYS000018
- Smokey Gap Oil Co. LLC WY0002941
- Snowy Owl, LLC WY0096814
- South Pass Petroleum Inc. WY0028860
- Spellbound Energy LLC WY0001694
- Strata Energy WY0095885
- Sunshine Valley Petroleum WY0034681
- T2 Operating Corporation WY0001350
- TA Operating LLC WY0035246
- TA Operating LLC dba Travel Centers of America WY0036153
- Tallgrass Midstream, LLC WY0056227
- Tata Chemicals North America WYS000019
- Ten Sleep, Town of WY0020168
- Thayne, Town of WY0025895
- The Daube Company WY0000272
- The Viking Resort LLC DBA Trailhead Lodge WY0052451
- Thermopolis, Town of WY0020192 · major
- Thunder Basin Coal Company, LLC WY0024091
- Thunder Basin Coal Company, LLC WY0028193
- Tobinsnet Oil & Gas LTD WY0045900
- Town of Albin WY0097033
- Town of Baggs WY0022888
- Town of Clearmont WY0022063
- Town of Fort Laramie WY0020567
- Town of Rock River WY0020184
- TriBar Resources, LLC WY0002721
- True Oil LLC WY0096920
- True Oil, LLC WY0034983
- True Oil, LLC WY0096521
- US Department of the Interior, Fish and Wildlife WY0035688
- US Forest Service - Bighorn National Forest WY0020931
- US SFR Owner, LLC WY0097036
- USA Energy, LLC WY0000817
- USA Energy, LLC WY0000825
- USA Energy, LLC WY0000841
- USA Energy, LLC WY0000906
- USA Energy, LLC WY0023990
- Union Pacific Railroad WY0000647
- Union Pacific Railroad Company WY0032590 · major
- University of Wyoming WY0032336
- Upton, Town of WY0020605
- VCP Wyoming, LLC WY0001520
- VCP Wyoming, LLC WY0002241
- VCP Wyoming, LLC WY0095346
- VCP Wyoming, LLC WY0095931
- Valkyrie Operating, LLC WY0000787
- Valkyrie Operating, LLC WY0001210
- Valkyrie Operating, LLC WY0024660
- Valkyrie Operating, LLC WY0026051
- Valkyrie Operating, LLC WY0034002
- Valkyrie Operating, LLC WY0035271
- Vaquero Bighorn, LLC WY0054798
- Vermilion Energy USA, LLC WY0096083
- Vermilion Energy USA, LLC WY0096091
- Vortex Petroleum, Inc. WY0026573
- WESCO OPERATING INC WY0000469
- WESCO OPERATING INC OIL AND GAS OPERATION WY0000221
- WY Basin Operating LLC WY0096679
- WY Basin Operating LLC WY0096776
- WYDOT WY0043745
- WYDOT - Basin WY0096725
- WYOIL Corporation WY0095923
- Wade's Mobile Manor WY0024651
- Wesco Operating WY0025607
- Wesco Operating - Tensleep #1 WY0025232
- Wesco Operating, Inc. WY0000493
- Western American Resources, LLC WY0096733
- Western Fuels-Wyoming, Inc. WY0032964
- Western Sugar Cooperative WY0000418 · major
- Westmoreland Haystack Mining LLC WY0096873
- White Rock Oil and Gas, L.L.C. WY0000388
- White Rock Oil and Gas, L.L.C. WY0024422
- White Rock Oil and Gas, L.L.C. WY0035491
- White Rock Oil and Gas, L.L.C. WY0043966
- Willow Springs Natural Spring Water WY0097004
- Wind River Energy Commission WY0000949
- Wind River Energy Commission WY0033740
- Worland, City of WY0020176 · major
- Wright Water & Sewer District WY0025992
- Wyodak Resources Development Corporation WY0001261
- Wyoming Air National Guard WY0028576
- Wyoming Air National Guard WY0056731
- Wyoming Game & Fish Department WY0001988
- Wyoming Game and Fish Department WY0000094
- Wyoming Game and Fish Department WY0002003
- Wyoming Game and Fish Department WY0002011
- Wyoming Game and Fish Department WY0002046
- Wyoming Game and Fish Department WY0002054
- Wyoming Game and Fish Department WY0095656
- Wyoming Refining Company WY0001163
- Yellow Creek Estates Mobile Home Park WY0028665
Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states