| ANACONDA MANUFACTURING | Hazardous waste | — | — | — | No Violation Identified |
| BATTISON AUTO CENTER INC | Hazardous waste | — | — | — | No Violation Identified |
| BIBLE MISSIONARY CHURCH CAMP | Drinking water | 3 | — | — | No Violation Identified |
| C E HARMON OIL INC / MCKINLEY TAYLOR TANK BATTERY | Air | — | — | — | No Violation Identified |
| C E HARMON OIL INC / THOMPSON TANK BATTERY | Air | — | — | — | No Violation Identified |
| CAMERON INTERNATIONAL CORP | — | — | — | — | — |
| CONTINENTAL RESOURCES / CALLAWAY 1 21H | Air | — | — | — | No Violation Identified |
| CONTINENTAL RESOURCES / HONEYCUTT 8 22 15XH HONEYCUTT 9 22 15X | Air | — | — | — | No Violation Identified |
| CONTINENTAL RESOURCES / LOVE 1 26 23XH | Air | — | — | — | No Violation Identified |
| CONTINENTAL RESOURCES / VANARKEL 2 15 10XH | Air | — | — | — | No Violation Identified |
| CONTINENTAL RESOURCES / VANARKEL 5 15 10XH | Air | — | — | — | No Violation Identified |
| COOK MFG CORP | Hazardous waste | — | — | — | No Violation Identified |
| CVS PHARMACY # 10274 | Hazardous waste | — | — | — | No Violation Identified |
| DCP MIDSTREAM LP/CENTRAL HIGH BOOSTER | Air | — | — | — | No Violation Identified |
| DINOS CLNR / 1015 OAK AVE DINO CLEANERS | Air, Hazardous waste | — | — | — | No Violation Identified |
| DKL BIG SPRING LLC / DUNCAN REFINED PRODUCTS TERMINAL | Air | — | — | — | No Violation Identified |
| DOLESE BROS. CO. - DUNCAN PLANT 2 | Water | 3 | — | — | No Violation Identified |
| DUNCAN #2 BATCH PLANT | — | — | — | — | — |
| DUNCAN ARMORY | Hazardous waste | — | — | — | No Violation Identified |
| DUNCAN PUBLIC UTILITIES AUTH | Water | 10 | 2 | $20,000 | Significant Violation |
| DUNCAN REGIONAL HOSP | Hazardous waste | — | — | — | No Violation Identified |
| DUNCAN REGIONAL ORTHOPAEDIC ASSOC INC | Hazardous waste | — | — | — | No Violation Identified |
| ET GATHERING PROCESSING LLC / VORTEX COMPRESSOR STATION | Air | 1 | — | — | No Violation Identified |
| FAMILY DOLLAR #3885 | Hazardous waste | — | — | — | No Violation Identified |
| FAMILY DOLLAR DISTRIBUTION CENTER OF DUNCAN, OK #204 | Hazardous waste | — | — | — | No Violation Identified |
| FW MIDCON I LLC / JARRED 1H 9X | Air | — | — | — | No Violation Identified |
| FW MIDCON I LLC / WRIGHT 2H 3H 4X VIRGINIA 1H 4X | Air | — | — | — | No Violation Identified |
| FW MIDCON I LLC / WRIGHT 5H 6H 4X | Air | — | — | — | No Violation Identified |
| GULFPORT MIDCON LLC / WRIGHT 2N4W 1 3H | Air | — | — | — | No Violation Identified |
| HALLIBURTON DUNCAN FIELD CAMP | — | — | — | — | — |
| HALLIBURTON ENERGY SERVICES INC / HALLIBURTON ENERGY INSTITUTE | Air | — | — | — | No Violation Identified |
| HALLIBURTON ENERGY SERVICES, INC. | Air, Hazardous waste | 2 | — | — | No Violation Identified |
| HALLIBURTON ENERGY SERVICES, INC. | Water | — | — | — | No Violation Identified |
| HALLIBURTON ENERGY SERVICES-DUNCAN FIELD | Air, Hazardous waste | — | — | — | No Violation Identified |
| HALLIBURTON ENGRY SVCS - PLANT 2 | Air, Hazardous waste | 1 | — | — | No Violation Identified |
| HALLIBURTON TECHNOLOGY CENTER | Air, Hazardous waste | 1 | — | — | No Violation Identified |
| HAULMARK INDUSTRIES INC | Air, Hazardous waste | — | — | — | No Violation Identified |
| HOWARD ENERGY PARTNERS / SHOLEM BOOSTER STATION | Air, Hazardous waste | — | — | — | No Violation Identified |
| INDUSTRIAL PAINT & BLAST | Hazardous waste | — | — | — | No Violation Identified |
| JMA ENERGY COMPANY / MILLER BRISCOE NO 1-36 | Air | — | — | — | No Violation Identified |
| MAGELLAN PIPELINE CO LP / DUNCAN STATION | Air | — | — | — | No Violation Identified |
| NEW CINGULAR WIRELESS PCS LLC DBA AT AN / 10110202 NORTH DUNCAN | Air | — | — | — | No Violation Identified |
| NEW CINGULAR WIRELESS PCS LLC DBA AT AN / 1101 NORTH HIGHWAY 81 FA10110198 | Air | — | — | — | No Violation Identified |
| NEW CINGULAR WIRELESS PCS LLC DBA AT AN / DUNCAN CO 10117566 | Air | — | — | — | No Violation Identified |
| NEW CINGULAR WIRELESS PCS LLC DBA AT AN / DUNCAN SEMINOLE FA10110203 | Air | — | — | — | No Violation Identified |
| NEW CINGULAR WIRELESS PCS LLC DBA AT AN / HALLIBURTON 10110199 | Air | — | — | — | No Violation Identified |
| NEW CINGULAR WIRELESS PCS LLC DBA AT AN / HERJE 14637963 | Air | — | — | — | No Violation Identified |
| NOV HYDRA RIG DUNCAN | Air, Hazardous waste | 1 | — | — | No Violation Identified |
| O'REILLY AUTO PARTS STORE 272 | Hazardous waste | — | — | — | No Violation Identified |
| ONEOK - OGT - A500 INTENSITY | Hazardous waste | — | — | — | No Violation Identified |
| ONEOK - OGT - A500/513 | Hazardous waste | — | — | — | No Violation Identified |
| ONEOK FIELD SERVICES CO LLC / MAYBERRY COMPRESSOR STATION | Air | — | — | — | No Violation Identified |
| PGM PROCESSING LLC / PGM PROCESSING | Air | — | — | — | No Violation Identified |
| PHILLIPS 66 COMPANY | Water | 2 | — | — | — |
| PLAINS PIPELINE LP / DUNCAN CRUDE OIL STATION | Air | 1 | — | — | No Violation Identified |
| REAMES CLNR/1206 N HWY 81 (REAME | Air, Hazardous waste | — | — | — | No Violation Identified |
| RED RIVER TECHNOLOGY CENTER | Hazardous waste | — | — | — | No Violation Identified |
| SENSIA | Hazardous waste | 1 | — | — | No Violation Identified |
| SOLITAIRE HOMES, INC. | — | — | — | — | — |
| SOUTHWEST PLATING INC / DUNCAN PLATING FACILITY | Air, Hazardous waste | — | — | — | No Violation Identified |
| STIM - LAB INC | Hazardous waste | — | — | — | No Violation Identified |
| TARGA PIPELINE MIDCONTINENT LLC / PLATO COMPRESSOR STATION | Air | — | — | — | No Violation Identified |
| TERRITORY RESOURCES LLC / WB STATION | Air | — | — | — | No Violation Identified |
| TMOBILE CENTRAL LLC / OK01791C | Air | — | — | — | No Violation Identified |
| TMOBILE CENTRAL LLC / OK03074B DUNCAN | Air | — | — | — | No Violation Identified |
| TRACTOR SUPPLY # 731 | Hazardous waste | — | — | — | No Violation Identified |
| US CELLULAR / HARRISBURG 751404 | Air | — | — | — | No Violation Identified |
| VALCO MFG / VALCO DUNCAN FACLTY | Air, Hazardous waste | — | — | — | No Violation Identified |
| VALET CLNR / 1623 W ELK VALET CLNR | Air, Hazardous waste | — | — | — | No Violation Identified |
| VERIZON WIRELESS / DUNCAN WEST OK | Air | — | — | — | No Violation Identified |
| VERIZON WIRELESS / EMPIRE CITY | Air | — | — | — | No Violation Identified |
| WALGREENS #5142 | Hazardous waste | — | — | — | No Violation Identified |
| WALMART SUPERCENTER #1116 | Hazardous waste | — | — | — | No Violation Identified |
| WESTERN FARMERS ELECTRIC COOPERATIVE / DUNCAN MW | Air | — | — | — | No Violation Identified |
| XTO ENERGY INC / LAWAYNE 1 17H PRODUCTION SITE | Air | — | — | — | No Violation Identified |