| 13-MILE LANDFILL - SECURE WASTE INFRASTRUCTURE USA LLC | Water | 1 | — | — | Significant Violation |
| 1804 LTD. LLC - SPRINGBROOK GAS PLANT - AQ | Air | 3 | — | — | No Violation Identified |
| 25017 - CRUSHING SITE | Water | — | — | — | No Violation Identified |
| 25017/28 SITE 1 | Water | — | — | — | No Violation Identified |
| 25017/28 SITE 3 | Water | — | — | — | No Violation Identified |
| 4TH DIMENSION SURVEYING & CONSULTING, INC. DEVELOPMENT | Water | — | — | — | No Violation Identified |
| ALBERTSONS 28 | Hazardous waste | — | — | — | No Violation Identified |
| AMAZON.COM SERVICES LLC - DAV6 | Hazardous waste | — | — | — | No Violation Identified |
| AMERADA HESS: BLDU #3 | Air | — | — | — | No Violation Identified |
| ANDERS-MADSON 5201-41-13H OASIS | Air | — | — | — | No Violation Identified |
| ASWS LLC/DELANEY POND/STORMWATER CONSTRUCTION | Water | — | — | — | No Violation Identified |
| BAKER HUGHES COMPLETIONS | Hazardous waste | — | — | — | No Violation Identified |
| BASIN ELECTRIC POWER COOPERATIVE | Water | 1 | — | — | No Violation Identified |
| BASIN ELECTRIC POWER COOPERATIVE - PIONEER GENERATION STATION - AQ | Air | 4 | — | — | No Violation Identified |
| BERGER 156-19-9-4-1H LIBERTY | Air | — | — | — | No Violation Identified |
| BETHEL LUTHERAN NURSING & REHAB CENTER | Water | — | — | — | No Violation Identified |
| BLACK HILLS TRUCKING INC-WILLISTON | Water, Hazardous waste | — | — | — | No Violation Identified |
| BNSF - WILLISTON RAILYARD | Water | — | — | — | No Violation Identified |
| BRUIN- STATE 157-100-32C-29-1H | Air | — | — | — | No Violation Identified |
| BRUIN- STATE157-100-29A-32-2H,157-100-29A-32-3H,MOLINE157-100-20D-17-2H,157-100 | Air | — | — | — | No Violation Identified |
| BRUIN-BORRUD 156-101-2A-11-2H,156-101-2B-11-3H,156-101-2B-11-4H,156--101-2B-11- | Air | — | — | — | No Violation Identified |
| CALFRAC WELL SERVICES CORP | Water, Hazardous waste | 1 | — | — | No Violation Identified |
| CASH WISE FOOD - WILLISTON 3046 | Hazardous waste | — | — | — | No Violation Identified |
| CHAMPIONX LLC - WILLISTON | Hazardous waste | 2 | — | — | No Violation Identified |
| CHAZLINE LLC | Hazardous waste | — | — | — | No Violation Identified |
| CHEMTREAT (RED RIVER SUPPLY WAREHOUSE) | Hazardous waste | — | — | — | No Violation Identified |
| CHI MERCY MEDICAL CENTER - WILLISTON | Hazardous waste | — | — | — | No Violation Identified |
| CHORD ENERGY - WILLISTON YARD | Hazardous waste | — | 2 | $17,000 | No Violation Identified |
| CHRISTOPHERSON'S TIN-LIZZY BODY SHOP | Hazardous waste | — | — | — | No Violation Identified |
| CITATION- JENNER 1-22 | Air | — | — | — | No Violation Identified |
| CITY OF WILLISTON - 13TH AVE WEST ROADWAY IMPROVEMENTS | Water | — | — | — | No Violation Identified |
| CITY OF WILLISTON - JAMES DRIVE IMPROVEMENTS | Water | — | — | — | No Violation Identified |
| CITY OF WILLISTON - WILLISTON LANDFILL - AQ | Air | 1 | — | — | No Violation Identified |
| CITY OF WILLISTON LANDFILL | Water | — | — | — | No Violation Identified |
| COASTAL CHEMICAL CO., LLC | Water | 1 | — | — | — |
| COASTAL CHEMICAL CO., LLC | Water | 1 | — | — | No Violation Identified |
| COMMONSPIRIT MEDICAL OUTPATIEN BUILDING - WILLISTON | Water | — | — | — | No Violation Identified |
| CONTINENTAL- ANNA 1-27H | Air | — | — | — | No Violation Identified |
| CONTINENTAL- ANNA 5-34H, 4-34H1, 3-34H, 2-34H | Air | — | — | — | No Violation Identified |
| CONTINENTAL- ANNAPOLIS 5-29H1, 4-29H & RALEIGH 4-20H, 5-20H1 | Air | — | — | — | No Violation Identified |
| CONTINENTAL- ATLANTA PAD (ATLANTA 1, 2, 3, 4, 11, 12, 13, 14-6H AND ATLANTA FED | Air | — | — | — | No Violation Identified |
| CONTINENTAL- HELENA 1-7H | Air | — | — | — | No Violation Identified |
| CONTINENTAL- HELENA 5-7H1 & 4-7H | Air | — | — | — | No Violation Identified |
| CONTINENTAL- MADISON 5-28H, 4-28H1 & PIERRE 5-21H, 4-21H1 | Air | — | — | — | No Violation Identified |
| CONTINENTAL- MEMPHIS 2-4H | Air | — | — | — | No Violation Identified |
| CONTINENTAL- PIERRE 3-21H, 2-21H & MADISON 3-28H, 2-28H | Air | — | — | — | No Violation Identified |
| CONTINENTAL- RALEIGH 3-20H, 2-20H1 & ANNAPOLIS 3-29H, 2-29H2 | Air | — | — | — | No Violation Identified |
| CONTINENTAL- RALEIGH 6-20H1, 7-20H, ANNAPOLIS 6-29H1, 7-29H | Air | — | — | — | No Violation Identified |
| COUGHLIN FUNERAL HOME, INC.-MID-WEST CREMATION SERVICES | Air | — | — | — | No Violation Identified |
| COUNTRY FLORAL | Hazardous waste | — | — | — | No Violation Identified |
| CREEDENCE ENERGY SERVICES - WILLISTON (NORTH) | Water, Hazardous waste | 3 | — | — | No Violation Identified |
| CRUSOE ENERGY SYSTEMS INC | Water | — | — | — | No Violation Identified |
| CUMMINS INC. - WILLISTON | Hazardous waste | — | — | — | No Violation Identified |
| DAKOTA ACCESS, LLC-TRENTON STATION | Air | — | — | — | No Violation Identified |
| DAKOTA SEWER DISPOSAL LLC | Water | 2 | — | — | No Violation Identified |
| DISHON DISPOSAL, INC. | Water | 1 | — | — | No Violation Identified |
| DOMINEK 13-24 TK1 BRIGHAM | Air | — | — | — | No Violation Identified |
| DRILLING TOOLS INTERNATIONAL, INC. | Water | 1 | — | — | No Violation Identified |
| DWS | Hazardous waste | — | — | — | No Violation Identified |
| ELECTRIC & MAGNETO INC. | Hazardous waste | — | — | — | No Violation Identified |
| ELLIS AND SOMERSET OASIS | Air | — | — | — | No Violation Identified |
| EQUINOR PIPELINES LLC-AUNE OIL FACILITY | Air | — | — | — | No Violation Identified |
| EQUINOR PIPELINES LLC-NE WILLIAMS CDP COMPRESSOR STATION | Air | — | — | — | No Violation Identified |
| EQUINOR PIPELINES LLC-TRENTON STATION | Air | — | — | — | No Violation Identified |
| FEDERAL EXPRESS - ZWLS | Hazardous waste | 1 | — | — | No Violation Identified |
| FEDERAL EXPRESS - ZWLS | Water | — | — | — | No Violation Identified |
| FEDERAL EXPRESS CORPORATION - ISNA | Water | 1 | — | — | No Violation Identified |
| FLINDERS AND ANVERS OASIS | Air | — | — | — | No Violation Identified |
| FLYING J PETROLEUMS INC WILLISTON REFINERY | Hazardous waste | 1 | — | — | No Violation Identified |
| GE OIL & GAS PRESSURE CONTROL | Hazardous waste | — | — | — | No Violation Identified |
| GEO RESOURCES INC | Air | — | — | — | No Violation Identified |
| HALLIBURTON - WILLISTON BAROID MUD PLANT | Water | — | — | — | No Violation Identified |
| HALLIBURTON ENERGY SERVICES - WILLISTON | Water | — | — | — | — |
| HALLIBURTON ENERGY SERVICES, INC. | Hazardous waste | 2 | — | — | No Violation Identified |
| HALLIBURTON ENERGY SERVICES, INC. - HALWEST FACILI | Water | — | — | — | No Violation Identified |
| HEDAHL'S PARTS PLUS | Hazardous waste | — | — | — | No Violation Identified |
| HESS NORTH DAKOTA PIPELINES LLC-WHEELOCK COMPRESSOR STATION | Air | — | — | — | No Violation Identified |
| HESS- BL-DAVIDSON- 155-96-0211H-5, 6, 7 & 156-96-3526H-8 & 156-96-3526H-7 | Air | — | — | — | No Violation Identified |
| HESS- SC-BINGEMAN-154-98-0904H-1 | Air | — | — | — | No Violation Identified |
| HILAND CRUDE, LLC-TRENTON STATION | Air | — | — | — | No Violation Identified |
| HILAND PARTNERS HOLDINGS LLC - 4RUNNER COMPRESSOR STATION | Air | 1 | — | — | No Violation Identified |
| HILAND PARTNERS HOLDINGS LLC - EDGEWATER COMPRESSOR STATION | Air | 1 | — | — | No Violation Identified |
| HILAND PARTNERS HOLDINGS LLC - RIVERS EDGE COMPRESSOR STATION | Air | 1 | — | — | No Violation Identified |
| HILAND PARTNERS HOLDINGS LLC - STONY CREEK COMPRESSOR STATION | Air | 1 | — | — | No Violation Identified |
| HILAND PARTNERS HOLDINGS LLC-BROGGER COMPRESSOR STATION | Air | — | — | — | No Violation Identified |
| HILAND PARTNERS HOLDINGS LLC-LAKESIDE COMPRESSOR STATION | Air | — | — | — | No Violation Identified |
| HILAND PARTNERS HOLDINGS LLC-TOPEKA COMPRESSOR STATION | Air | — | — | — | No Violation Identified |
| HUNTING TITAN, INC. | Water | 1 | — | — | No Violation Identified |
| IHD SOLIDS MANAGEMENT | Water | 1 | — | — | No Violation Identified |
| IMPERATIVE CHEMICAL PARTNERS – WILLISTON LAB | Hazardous waste | — | — | — | No Violation Identified |
| INTERSTATE DETROIT DIESEL INC | Hazardous waste | — | — | — | No Violation Identified |
| JERRY SCHAUER - BLUE WATER DEVELOPMENT | Water | — | — | — | No Violation Identified |
| JMAC RESOURCES, INC | Hazardous waste | — | — | — | No Violation Identified |
| JMAC RESOURCES, WASTEWATER TREATMENT FACILITY | Water | 1 | — | — | No Violation Identified |
| JOHNSON 29-30 ZENERGY | Air | — | — | — | No Violation Identified |
| KARL 10-3 BRIGHAM | Air | — | — | — | No Violation Identified |
| LEONARDITE PRODUCTS LLC | Water | 1 | — | — | No Violation Identified |
| LIBERTY OILFIELD SERVICES | Water | — | — | — | No Violation Identified |
| LIBERTY OILFIELD SERVICES - WILLISTON PDP | Hazardous waste | — | — | — | No Violation Identified |
| LIBERTY OILFIELD SERVICES - WILLISTON, ND | Hazardous waste | — | — | — | No Violation Identified |
| MARMON YARD | Hazardous waste | — | — | — | No Violation Identified |
| MELVILLE & BAFFIN | Air | — | — | — | No Violation Identified |
| MIDWEST INDUSTRIAL MAINTENANCE LLC | Hazardous waste | — | — | — | No Violation Identified |
| MODEL DRIVE IN CLEANERS-MODEL DRIVE-IN CLEANERS | Hazardous waste | — | — | — | No Violation Identified |
| MURPHY MOTORS | Hazardous waste | — | — | — | No Violation Identified |
| NABORS DRILLING WILLISTON FACILITY | Water | — | — | — | No Violation Identified |
| NATIONAL OILWELL VARCO | Hazardous waste | — | — | — | No Violation Identified |
| NATIONAL OILWELL VARCO DHT, LP | Hazardous waste | — | — | — | No Violation Identified |
| NDARNG - WILLISTON ARMORY | Hazardous waste | — | — | — | No Violation Identified |
| NDDOT - MINOT DISTRICT OFFICE - PCN 22484 US HWY 52 CSI 26003 | Water | — | — | — | No Violation Identified |
| NDDOT WILLISTON DISTRICT | Water | 1 | — | — | — |
| NDDOT WILLISTON DISTRICT -WILLISTON US HIGHWAY 2 FROM 9TH AVE W TO N OF 3 | Water | 13 | — | — | No Violation Identified |
| NESSON GATHERING SYSTEM, LLC-PAL PROPERTIES COMPRESSOR STATION | Air | — | — | — | No Violation Identified |
| NEXTEIR COMPLETION SOLUTIONS - WILLISTON NORTH FACILITY | Water | — | — | — | No Violation Identified |
| NEXTIER COMPLETION SOLUTIONS | Hazardous waste | 3 | — | — | No Violation Identified |
| NORTH DAKOTA STATE DEPT OF TRANSPORTATION | Hazardous waste | — | — | — | No Violation Identified |
| NORTHERN IMPROVEMENT COMPANY - RALFSTAD PIT | Water | — | — | — | No Violation Identified |
| NOV TUBOSCOPE | Water, Hazardous waste | 1 | — | — | No Violation Identified |
| OASIS- KESTREL 5401-43-22H | Air | — | — | — | No Violation Identified |
| OASIS- LYNN 5502-11 | Air | — | — | — | No Violation Identified |
| OASIS- MOORE 5304-13-1H | Air | — | — | — | No Violation Identified |
| OIL PATCH GROUP LLC - STOUT 8 | Water | 1 | — | — | No Violation Identified |
| ONEOK ROCKIES MIDSTREAM, L.L.C. - STATELINE GAS PLANT - AQ | Air | 2 | — | — | No Violation Identified |
| PACIFIC STEEL & RECYCLING | Water | — | — | — | No Violation Identified |
| PACKERS PLUS ENERGY SERVICES (USA) INC | Water | 1 | — | — | No Violation Identified |
| PAT'S OFFROAD INC | Hazardous waste | — | — | — | No Violation Identified |
| PENNEY OPCO LLC 0113 | Hazardous waste | — | — | — | No Violation Identified |
| PIONEER GENERATING STATION | Water | 1 | — | — | No Violation Identified |
| PLAINS MARKETING WILLISTON TRUCK SHOP | Hazardous waste | — | — | — | No Violation Identified |
| POLAR MIDSTREAM, LLC-EPPING STATION | Air | — | — | — | No Violation Identified |
| POLAR SERVICE CENTER - WILLISTON | Hazardous waste | — | — | — | No Violation Identified |
| PRECISION ADDITIVES INC | Water | 2 | — | — | No Violation Identified |
| QUAIL TOOLS LP | Water, Hazardous waste | — | — | — | No Violation Identified |
| RDO EQUIPMENT CO - WILLISTON | Hazardous waste | — | — | — | No Violation Identified |
| RED BANK COMPRESSOR STATION | Hazardous waste | — | — | — | No Violation Identified |
| RED RIVER SUPPLY | Hazardous waste | — | — | — | No Violation Identified |
| ROSE ROCK MIDSTREAM, LP-TRENTON STATION | Air | — | — | — | No Violation Identified |
| RUACH RESOURCES LLC - WILLISTON READY MIX PLANT | Water | — | — | — | Violation Identified |
| RYAN MOTORS, INC. | Hazardous waste | — | — | — | No Violation Identified |
| SABIN METAL WEST CORP | Air, Water, Hazardous waste | 7 | — | — | No Violation Identified |
| SAFUELS X RENEWABLE FUELS FACILITY | Water | 2 | — | — | No Violation Identified |
| SAM 30-31 BRIGHAM | Air | — | — | — | No Violation Identified |
| SANDAKER, CLARK & NJOS FEDERAL OASIS | Air | — | — | — | No Violation Identified |
| SAVAGE INFRASTRUCTURE, LLC - SAVAGE PIPE YARD | Water, Hazardous waste | — | — | — | No Violation Identified |
| SAVAGE SERVICES CORP. - SAVAGE BAKKEN PETROLEUM SERVICES HUB | Air | 2 | — | — | No Violation Identified |
| SCHLUMBERGER TECHNOLOGY CORP | Hazardous waste | 1 | — | — | No Violation Identified |
| SCHLUMBERGER TECHNOLOGY CORP - WILLISTON | Hazardous waste | 2 | — | — | No Violation Identified |
| SCHLUMBERGER TECHNOLOGY CORP. | Hazardous waste | — | — | — | No Violation Identified |
| SCHLUMBERGER WIRELINE | Hazardous waste | — | — | — | No Violation Identified |
| SECURE ENERGY | Hazardous waste | — | — | — | No Violation Identified |
| SHERWIN-WILLIAMS #3017 | Hazardous waste | — | — | — | No Violation Identified |
| SHERWIN-WILLIAMS #703421 | Hazardous waste | 1 | — | — | No Violation Identified |
| SIMONS PETROLEUM - WILLISTON | Hazardous waste | — | — | — | No Violation Identified |
| SLAWSON- STAMPEDE 1-36-25H | Air | — | — | — | No Violation Identified |
| SLB | Hazardous waste | 1 | — | — | No Violation Identified |
| STALLION OILFIELD SERVICES-WI | Water | 1 | — | — | No Violation Identified |
| STAMPEDE 2-36-25H | Air | — | — | — | No Violation Identified |
| STATELINE COMPLEX | — | — | — | — | — |
| STATOIL- JAKE 2 PAD (JAKE 2-11 1H, 2-11 2TFH) | Air | — | — | — | No Violation Identified |
| STATOIL- JAKE 4 PAD (JAKE 2-11 3TFH, 2-11 4H, 2-11 6H, 2-11 5TFH) | Air | — | — | — | No Violation Identified |
| STATOIL- LEE 16-21-1H | Air | — | — | — | No Violation Identified |
| STATOIL- SUKUT 28-33-1H | Air | — | — | — | No Violation Identified |
| STEALTH ENERGY GROUP | Hazardous waste | — | — | — | No Violation Identified |
| STEALTH ENERGY GROUP | Hazardous waste | — | — | — | No Violation Identified |
| STOCKMAN MOTORS | Hazardous waste | — | — | — | No Violation Identified |
| STRATA CONCRETE, WILLISTON WEST - STRATA CORPORATION | Water | — | — | — | No Violation Identified |
| STRATA CONCRETE-WILLISTON SHOP | Water | — | — | — | No Violation Identified |
| SYLTE 156-101-3&156-101-15 TK508 LIBERTY | Air | — | — | — | No Violation Identified |
| TESORO HIGH PLAINS PIPELINE COMPANY LLC-TIOGA STATION | Air | — | — | — | No Violation Identified |
| THOMAS PETROLEUM, LLC - NORTH | Hazardous waste | — | — | — | No Violation Identified |
| TRACTOR & EQUIPMENT COMPANY | Hazardous waste | — | — | — | No Violation Identified |
| TRACTOR SUPPLY #147 | Hazardous waste | — | — | — | No Violation Identified |
| TRANSPORTATION SECURITY ADMIN (TSA) - WILLISTON BASIN INTERNAT'L (XWA) | Hazardous waste | — | — | — | No Violation Identified |
| TRENTON STATION | Hazardous waste | — | — | — | No Violation Identified |
| UND WILLISTON | Hazardous waste | — | — | — | No Violation Identified |
| UNITED PARCEL SERVICE - WILLISTON | Hazardous waste | — | 2 | $5,300,000 | No Violation Identified |
| V-TIC SERVICES INC | Hazardous waste | 1 | — | — | No Violation Identified |
| VAC U JET WWTP | Water | 3 | — | — | No Violation Identified |
| VALENCE NATURAL GAS SOLUTIONS - FGC 004 | Air | — | — | — | No Violation Identified |
| WALMART SUPERCENTER #1565 | Hazardous waste | 1 | — | — | No Violation Identified |
| WBI ENERGY STATELINE RECEIPT STATION | Hazardous waste | — | — | — | No Violation Identified |
| WBI ENERGY TRANSMISSION, INC.-WILLISTON COMPRESSOR STATION | Air | — | — | — | No Violation Identified |
| WEATHERFORD INTERNATIONAL SUPER CENTER | Hazardous waste | — | — | — | No Violation Identified |
| WELLBORE INTEGRITY SOLUTIONS (WIS) | Water, Hazardous waste | 1 | — | — | Significant Violation |
| WESTERN AREA WATER SUPPLY AUTHORITY - STORMWATER CONSTRUCTION | Water | — | — | — | No Violation Identified |
| WESTERN AREA WATER SUPPLY AUTHORITY - WAWSA-NWRWD EAST WILLISTON & CR 9 RURAL EX | Water | — | — | — | No Violation Identified |
| WHITING- CARSCALLEN 31-14-1TFH, 3TFH, 14H, 3H, 4H, 2H | Air | — | — | — | No Violation Identified |
| WHITING- EVITT 14-12-4TFHX & EVITT 14-12H, 12TFH & EVITT 34-12-2H, 34-12H, 34-12 | Air | — | — | — | No Violation Identified |
| WHITING- JACKMAN 156-100-18-19-1H, BERGER 156-100-7-6-1H & P JACKMAN 156-100-2-1 | Air | — | — | — | No Violation Identified |
| WHITING- JOHNSON 24-7-4H, 3H, 2H & 24-7H | Air | — | — | — | No Violation Identified |
| WHITING- KEELING 31-13TFH, 13H, 2H | Air | — | — | — | No Violation Identified |
| WHITING- NELSON 21-18TFH, 21-18-2TFH, 11-18TFHU, 11-18TFH, 11-18H, 5-18H | Air | — | — | — | No Violation Identified |
| WHITING- P EVITT 154-98-15-12-1-2H3M, 154-98-15-12-2-2H, 154-98-15-12-19-16H, 1 | Air | — | — | — | No Violation Identified |
| WHITING- P EVITT 154-98-13-12-1-3H3, 4H & P EVITT 154-98-13-12-24-14H3M & P EVIT | Air | — | — | — | No Violation Identified |
| WHITING- P WOOD 154-98-13-22-16-12H, 4H, 4H3A | Air | — | — | — | No Violation Identified |
| WHITING- P WOOD 154-98-14-22-15-2H3, 3H3 & P WOOD 154-98-14-22-16-2H, 3H, 3HA | Air | — | — | — | No Violation Identified |
| WHITING- P WOOD 154-98-15-23-15-3H, 2HA, 2H & P WOOD 154-98-15-23-35-15H3A, 15 | Air | — | — | — | No Violation Identified |
| WHITING- P WOOD 154-98-16-23-14-1H3, 1H3A, 2H3 & 154-98-16-23-15-1H & 154-98-16 | Air | — | — | — | No Violation Identified |
| WHITING- P WOOD 154-98-2-27-34-15H, 16H3B, 16H, 16H3A | Air | — | — | — | No Violation Identified |
| WHITING- P WOOD 154-98-3-27-34-14H3, 15H, 15H3M & P WOOD 154-98-3-27-34-14H | Air | — | — | — | No Violation Identified |
| WHITING- P WOOD 154-98-4-26-35-13H, 13H3, 14H, 14H3 | Air | — | — | — | No Violation Identified |
| WHITING- P WOOD 154-98-4-27-34-13HB, 13H3, 13HA, 14H3 | Air | — | — | — | No Violation Identified |
| WHITING- P WOOD 154-98-4E-26-35-14HA, 4H, 14H, 14H3 | Air | — | — | — | No Violation Identified |
| WILLIAMS COUNTY - STORMWATER CONSTRUCTION | Water | — | — | — | No Violation Identified |
| WILLIAMS COUNTY HIGHWAY COMPLEX | Water | — | — | — | No Violation Identified |
| WILLIAMS COUNTY PARKS - BLACKTAIL DAM IMPROVEMENTS | Water | 1 | — | — | No Violation Identified |
| WILLIAMS COUNTY US 2, FROM 9TH AVE TO N OF 34TH ST W - WILLISTON-CONTRACTOR STAG | Water | — | — | — | No Violation Identified |
| WILLIAMS RURAL WATER DISTRICT | Drinking water | — | — | — | No Violation Identified |
| WILLISTON | Drinking water | — | — | — | No Violation Identified |
| WILLISTON 25-36 TK1 BRIGHAM | Air | — | — | — | No Violation Identified |
| WILLISTON BASIN INTERNATIONAL AIRPORT(XWA) | Water | — | — | — | Violation Identified |
| WILLISTON CEMENT PLANT - SCHLUMBERGER | Water | 1 | — | — | — |
| WILLISTON CITY OF | Water | 8 | — | — | No Violation Identified |
| WILLISTON CITY OF | Water | — | — | — | No Violation Identified |
| WILLISTON FACILITY BAKER PETROLITE | Water | 1 | — | — | No Violation Identified |
| WILLISTON ICE AND TURF FACILITY | Water | — | — | — | No Violation Identified |
| WILLISTON INDUSTRIAL SUPPLY CORP. | Water | 1 | — | — | No Violation Identified |
| WILLISTON LAB - TRIPLE 8 ASSETS | Hazardous waste | — | — | — | No Violation Identified |
| WILLISTON STATE COLLEGE | Water | 2 | — | — | No Violation Identified |
| WILLISTON WATER TREATMENT PLANT | Water | 3 | — | — | No Violation Identified |
| WISCO, INC.-WILLISTON FACILITY | Air | — | — | — | No Violation Identified |
| WPR, LLC - STORMWATER CONSTRUCTION | Water | 1 | — | — | No Violation Identified |
| XTO- RAYMOND 21X-5, 5A, 5E, 5AXB, 5FXG | Air | — | — | — | No Violation Identified |
| XTO- WILLEY 31X-3H, 3F, 3G, 3D, 3 | Air | — | — | — | No Violation Identified |
| XTO- WOOD 21X-25A, 25AXB, 25B | Air | — | — | — | No Violation Identified |
| YOUNG BROS. LLC | Hazardous waste | — | — | — | No Violation Identified |
| ZINE 12-1 STATOIL/BRIGHAM | Air | — | — | — | No Violation Identified |