NPDES discharge permits — SD

199 active individual permits with limits in EPA's file of 2026-09-19.

• Aberdeen Energy (Glaicial Lakes Energy - Mina) SD0028509
• Aberdeen, City of SD0020702 · major
• Agropur (Lake Norden Facility) SD0025411
• Alcester, City of SD0021695
• Alpena, Town of SD0025887
• Apple Springs Resort (H2O Clear Solutions LLC) SD0028620
• Arlington, City of SD0020753
• Armour, City of SD0020222
• Ashton, Town of SD0022276
• Astoria, Town of SD0025194
• Avon, City of SD0022730
• Belle Fourche, City of SD0021628
• Beresford, City of SD0020079
• Black Hills Corp LCTF SD0027871
• Blunt, City of SD0025020
• Brandon WTP SD0028654
• Bridgewater, City of SD0021512
• Brookings Municipal Utilities SD0023388 · major
• Bryant, City of SD0021555
• Buffalo, Town of SD0023400
• Canistota, City of SD0022497
• Canton, City of SD0022489
• Centerville, City of SD0022527
• Chamberlain, City of SD0023698
• Chancellor, Town of SD0023639
• Chester Sanitary District SD0020338
• Citation Oil and Gas Corporation SD0025861
• City of Wagner SD0020184
• Clay Rural Water System - Wynstone SD0028011
• Clear Lake, City of SD0020699
• Coffee Cup Fuel Stops SD0027456
• Colman, City of SD0022551
• Colome, City of SD0023230
• Colton, City of SD0022322
• Columbia, City of SD0022926
• Conde, Town of SD0021547
• Corsica, City of SD0021962
• Country Village MHC SD0026999
• Crooks, City of SD0020761
• Custer, City of SD0023281
• Dacotah Bank SD0028568
• Dakota Ethanol, LLC SD0027847
• Dell Rapids, City of SD0022101
• Doland, City of SD0020605
• Eagle Butte - City of SD0020192
• East Dakotas Renewable Energy, LLC SD0028649
• Edgemont, City of SD0023701
• Elk Point, City of SD0022080
• Elkton, City of SD0020788
• Emery, City of SD0021741
• Empirical Technology SD0028606
• Estelline, City of SD0022144
• Ethan, Town of SD0022934
• Eureka, City of SD0020851
• Evans Plunge (Hot Springs, City of) SD0024767
• Faulkton, City of SD0021971
• Flandreau, City of SD0021831
• Frankfort, City of SD0020869
• Frederick, Town of SD0022152
• Freeman, City of SD0022110
• Ft. Pierre, City of SD0023582
• GCC Dacotah SD0000027
• Garretson, City of SD0022560
• Golden Rewards Mining Co. SD0026905 · major
• Grass Ranch Hutterian Brethren SD0028648
• Gregory, City of SD0022179
• Groton, City of SD0022187
• Haakon School District 27-1 SD0025569
• Harrisburg, City of SD0023728
• Hartford, City of SD0021750
• Hermosa, Town of SD0022349
• Herreid, City of SD0022900
• Hill City, City of SD0020885
• Homestake Mining Company - Open Cut SD0025933
• Hot Springs, City of SD0022918 · major
• Howard, City of SD0020613
• Hub City Energy SD0026816
• Huron, City of SD0023434 · major
• Interior, Town of SD0021857
• Ipswich, City of SD0022519
• Irene, City of SD0022454
• Kennebec, Town of SD0022861
• Keystone, Town of SD0024007
• Kimball, City of SD0022772
• Knife River - Knodel Pit SD0028643
• L.G. Everist, Inc. SD0000051
• L.G. Everist, Inc. (NWIA) SD0027928
• L.G. Everist, Inc. - East Sioux Quarry SD0028576
• LAC Minerals (USA) LLC SD0026883 · major
• Lake Andes, City of SD0022004
• Lake Cochrane Sanitary District SD0026514
• Lake Preston, City of SD0023655
• Lanast LLC Dba Arctic Ice SD0027588
• Lead - Deadwood Sanitary District SD0020796 · major
• Lead, City of (CSO) SD0027481
• Lennox, City of SD0021768
• Leola, City of SD0022667
• Lower Brule Sioux Tribe SD0020800
• Lumber Exchange, LLC C/O Lloyd Companies SD0028627
• Madison, City of SD0020010 · major
• Marion, City of SD0020311
• Menno, City of SD0020087
• Midwest Railcar Repair, Inc. SD0028436
• Milbank, City of SD0020371 · major
• Miller, City of SD0022659
• Mina Lake Sanitary District SD0026344
• Mission Hill, Town of SD0026611
• Mitchell, City of SD0023361 · major
• Mobridge, City of SD0020028
• Monroe, Town of SD0023752
• Montrose, City of SD0022012
• New Effington, Town of SD0020931
• North Sioux City, City of SD0020567
• Northern States Power - Angus Anson Generating Plant SD0000264
• Northville, Town of SD0028053
• NuGen Energy, LLC SD0028380
• Oacoma, Town of SD0020737
• Parker, City of SD0020940
• Parkston, City of SD0022021
• Peever, Town of SD0022756
• Pete Lien & Sons, Inc SD0000094
• Pete Lien & Sons, Inc. DBA Birdsall Sand & Gravel Company SD0000183
• Philip, City of SD0020303
• Pierre, City of SD0020176 · major
• Plankinton, City of SD0020958
• Platte, City of SD0020354
• Poet Biorefining - Chancellor SD0027901
• Poet Biorefining - Groton SD0027910
• Poet Biorefining - Hudson SD0027944
• Poet Biorefining - Mitchell SD0028240
• Powder House Pass CID SD0028615
• Presho, City of SD0020117
• Rapid City Regional Recycling And Landfill SD0027685
• Rapid City, City of SD0023574 · major
• Red River Energy, LLC SD0027855
• Redfield Energy LLC SD0028193
• Roscoe, City of SD0020036
• Rosebud Casino and Hotel WWTF SD0034584
• Rosedale Hutterian Brethren SD0028177
• Rosholt, Town of SD0020524
• Roslyn, Town of SD0022802
• SD DOT - Glacial Lakes Rest Area SD0025313
• SD GFP - Cleghorn Fish Hatchery SD0000060
• SD GFP - Game Lodge (Custer State Park) SD0024244
• SD GFP - Mcnenny Fish Hatchery SD0000191
• SD GFP - Sylvan Lake (Custer State Park) SD0024279
• SD Science And Technology Authority SD0000043 · major
• SD Science And Technology Authority SD0028134
• SD Soybean Processors - Miller Facility SD0028644
• Salem, City of SD0020966
• Scotland, City of SD0022853
• Selby, City of SD0021717
• Sioux Falls, City of SD0022128 · major
• Sisseton, City of SD0020826
• Smithfield Foods SD0000078 · major
• South Dakota Ellsworth Development Authority (SDEDA) SD0028611 · major
• Spartan Emergency Response SD0028658
• Spearfish, City of SD0020044 · major
• Spring Creek/Cow Creek Sanitary District SD0028661
• Springfield WTP SD0028647
• St. Josephs Indian School SD0025798
• St. Lawrence, Town of SD0020982
• Sturgis, City of SD0020052 · major
• Summerset, City of SD0027758
• Summit, Town of SD0022811
• T & R Electric Supply Co., Inc. SD0025437
• Tabor, Town of SD0022209
• Toronto, Town of SD0021571
• Tripp, City of SD0022403
• USAF - Ellsworth AFB SD0000281 · major
• USCOE - Big Bend Dam SD0026361
• USCOE - Ft Randall Dam SD0020648
• USCOE - Oahe Dam SD0026794
• USFS - Boxelder JCCCC SD0020834
• USGS - Eros Data Center SD0000299
• USNPS - Mt. Rushmore National Memorial SD0021610
• USVA - Sioux Falls VA Health Care System SD0028631
• Valero Renewable Fuels Company, LLC SD0027898
• Valley Queen Cheese, Inc SD0027987
• Valley Springs, City of SD0020923
• Veblen, City of SD0020001
• Vermillion, City of SD0020061 · major
• Viborg, City of SD0020541
• Vishay-Dale Electronics SD0025917
• Volga, City of SD0021920
• Wakonda, Town of SD0020257
• Wall Lake Sanitary District SD0026778
• Warner, Town of SD0020389
• Watertown, City of SD0023370 · major
• Wessington Springs, City of SD0020460
• Wharf Resources (USA), Inc. SD0025852 · major
• White River, City of SD0022063
• White, City of SD0021636
• Whitewood, City of SD0021466
• Wilmot, City of SD0021024
• Winner, City of SD0020401
• Worthing, City of SD0021474
• Yankton, City of SD0023396 · major
• Yankton, City of Water Purification Facility SD0028628

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