| A Cut Above Processing and Meat Market LLC | Water - State Operating Permit | Perkinston | Hancock |
| A and B Inc | Water - State Operating Permit Renewal | Pelahatchie | Rankin |
| AAA Hospitality LLC, 220 Truck Stop | Water - NPDES Commercial Renewal | Tillatoba | Yalobusha |
| AC Polymers Inc | Air - SMOP Renewal | Byhalia | Marshall |
| ADLAM Films LLC | Air - SMOP Renewal | Shannon | Lee |
| AEI LLC | Water - Pretreatment Renewal | Senatobia | Tate |
| AG AIR, LLC | Water - State Operating Permit Renewal | Scott | Bolivar |
| AJs Enterprises Inc, Rons Wash Place | Water - NPDES Commercial Renewal | Roxie | Franklin |
| AMCO Manufacturing Company LLC | Air - SMOP Renewal | Yazoo City | Yazoo |
| ANDRITZ Inc, ANDRITZ Fabrics and Rolls | Water - Pretreatment Renewal | Starkville | Oktibbeha |
| ANR Pipeline Company, Greenville Compressor Station | Water - NPDES Minor Industrial Renewal | Greenville | Washington |
| ANR Pipeline Company, Sardis Compressor Station | Air - Title V Renewal | Sardis | Panola |
| APAC Mississippi Inc, Benton Mine | Water Quality - 401 Certification | Benton | Yazoo |
| ARI Railcar Services LLC, Bude Facility | Air - SMOP Renewal | Bude | Franklin |
| AVM 104 LLC | Water - NPDES Commercial Admin Mod | Picayune | Hancock |
| Advanced Distributor Products LLC | Air - Title V Renewal | Grenada | Grenada |
| Ag Concepts Inc | Water - State Operating Permit Renewal | Itta Bena | Leflore |
| Air Worthy Inc | Water - State Operating Permit Renewal | Lyon | Coahoma |
| Airgas Carbonic Inc, Star Plant | Water - NPDES Commercial Renewal | Star | Rankin |
| Airport Industrial Park | Water - NPDES Minor Industrial Renewal | Aberdeen | Monroe |
| Ajinomoto Foods North America, Inc | Water - Pretreatment Renewal | Oakland | Yalobusha |
| Alligator POTW | Water - NPDES Minor Municipal Renewal | Alligator | Bolivar |
| Alternative Energy Development Copiah LLC | Air - Construction Admin Mod | Hazlehurst | Copiah |
| AmeriPride Services LLC, Durant Plant | Water - Pretreatment ADMIN | Durant | Holmes |
| Amick Farms LLC, Laurel Feed Mill | Water - Pretreatment ADMIN | Laurel | Jones |
| Amick Farms LLC, Laurel Feed Mill | Air - SMOP Admin Mod | Laurel | Jones |
| Amick Farms LLC, Laurel Processing Plant | Water - Pretreatment ADMIN | Laurel | Jones |
| Amite BioEnergy LLC, Wood Pellet Manufacturing Facility | Water - NPDES Minor Industrial | Gloster | Amite |
| Applewhite Subdivision | Water Quality - 401 Certification | Ocean Springs | Jackson |
| Arbor Landing | Water Quality - 401 Certification | Brandon | Rankin |
| Ashley Furniture Industries Inc, Verona Facility | Air - Construction Permit Modification | Verona | Lee |
| Ashley Furniture Industries Inc, Verona Facility | Air - SMOP Modification | Verona | Lee |
| Atlantic Dry Ice LLC | Water - State Operating Permit Renewal | Brandon | Rankin |
| Attala Steel Industries LLC | Water - State Operating Permit Renewal | Kosciusko | Attala |
| Axiall LLC | Air - Title V Renewal | Aberdeen | Monroe |
| Axiall LLC | Air - Construction Permit Modification | Aberdeen | Monroe |
| BACCO Materials Inc, Air Base Mine | Water - State Operating Permit Admin Mod | Columbus | Lowndes |
| BACCO Materials Inc, Air Base Mine | Water - State Operating Permit Admin Mod | Columbus | Lowndes |
| BFEL Indemnitor Inc, Potter Production Facility | Water - NPDES Minor Industrial Renewal | Wesson | Copiah |
| BFI Waste Systems of Mississippi LLC, Big River Landfill | Water Quality - 401 Certification | Leland | Washington |
| Barge Forest Products Company | Water - NPDES Minor Industrial Renewal | Macon | Noxubee |
| Barnes Crossing Hyundai Mazda | Water Quality - 401 Certification | Tupelo | Lee |
| Bass Memorial Academy | Water - NPDES Commercial Renewal | Lumberton | Lamar |
| Batesville Manufacturing Inc, Vicksburg | Air - Title V Renewal | Vicksburg | Warren |
| Beau Rivage Resorts LLC, Fallen Oak Golf Course | Water - State Operating Permit Renewal | Saucier | Harrison |
| Bellwill Properties, LLC, Henderson Shores Subdivision | Water Quality - 401 Certification | Pass Christian | Harrison |
| Benoit Flying Service Inc | Water - State Operating Permit Renewal | Benoit | Bolivar |
| Bernard Bayou Industrial District | Water Quality - 401 Certification | Gulfport | Harrison |
| Bertucci Park, Bertucci Subdivision | Water Quality - 401 Certification | Biloxi | Harrison |
| Black Sea Petroleum Inc dba Shady Oak Express | Water - NPDES Commercial Renewal | Lyon | Coahoma |
| Black Snake Petroleum, LLC, MB 26-1H Number 1 Facility | Air - SMOP Admin Mod | Caledonia | Lowndes |
| Blain Sand and Gravel Inc, Bailey Road Shop | Water - State Operating Permit Admin Mod | Georgetown | Copiah |
| Blain Sand and Gravel Inc, Bailey Road Shop | Water - State Operating Permit Admin Mod | Georgetown | Copiah |
| Blessed Investment Team LLC, Anchor Landing Subdivision | Water Quality - 401 Certification | Biloxi | Harrison |
| Boe Farms LLC | Water - State Operating Permit Renewal | Moselle | Jones |
| Briar Hill Rest Home LLC | Water - NPDES Commercial Renewal | Florence | Rankin |
| Brick and Company LLC, Durham Trail | Water - State Operating Permit Renewal | Petal | Forrest |
| C L Dews and Sons Foundry and Machinery Company Inc | Air - SMOP Renewal | Hattiesburg | Forrest |
| Caesar Oaks LLC, Caesar Oaks Wastewater Treatment Facility | Water - NPDES Commercial Renewal | Carriere | Pearl River |
| Caledonia Energy Partners LLC, Caledonia Gas Storage Facility | Air - SMOP Renewal | Caledonia | Lowndes |
| Caledonia POTW | Water - NPDES Minor Municipal Renewal | Caledonia | Lowndes |
| Canebrake Utilities Association Inc, Bellegrass Lagoon and Spray Field | Water - State Operating Permit Renewal | Hattiesburg | Lamar |
| Canton Municipal Utilities, Beatties Bluff Wastewater Treatment Facility | Water - NPDES Major Municipal Renewal | Canton | Madison |
| Canton Municipal Utilities, Hydrograph Controlled Release POTW | Water - NPDES Major Municipal Renewal | Canton | Madison |
| Caterpillar Inc | Water - Pretreatment Renewal | Corinth | Alcorn |
| Caterpillar Inc, Caterpillar Remanufactured Components Group | Air - SMOP Modification | Booneville | Prentiss |
| Caterpillar Inc, Caterpillar Remanufactured Components Group | Air - SMOP Modification | Booneville | Prentiss |
| Central Industries Inc, dba River Valley Ingredients | Water - NPDES Major Industrial Admin Mod | Forest | Scott |
| Chambers Clearview Environmental Landfill Inc | Water - Pretreatment Renewal | Lake | Scott |
| Chambers Clearview Environmental Landfill Inc | Water - NPDES Storm Renewal | Lake | Scott |
| Chevron USA Inc, Chevron Products Company, Pascagoula Refinery | Water - NPDES Major Industrial Renewal | Pascagoula | Jackson |
| Chevron USA Inc, Chevron Products Company, Pascagoula Refinery | Hazardous Waste - TSD Renewal | Pascagoula | Jackson |
| Choctaw Flying Service Inc | Water - State Operating Permit Renewal | Inverness | Sunflower |
| Chucks Flying Service LLC | Water - State Operating Permit Renewal | Canton | Madison |
| Chukstop Inc | Water - NPDES Commercial Renewal | Jackson | Hinds |
| Church of Acts, The | Water - NPDES Commercial Renewal | New Albany | Union |
| Cintas Corporation Number 2 | Water - Pretreatment Renewal | Jackson | Hinds |
| Circle K Stores Inc, 2721539 | Water - NPDES Commercial Renewal | Pontotoc | Pontotoc |
| Circle K Stores Inc, 2723386 | Water - State Operating Permit Renewal | Brooklyn | Forrest |
| Circle K Stores Inc, 2723397 | Water - NPDES Commercial Renewal | Magee | Simpson |
| Citgo Petroleum Corporation, Vicksburg Terminal | Air - SMOP Modification | Vicksburg | Warren |
| City of Starkville, Starkville Class I Rubbish Site | Solid Waste - Rubbish Modification | Starkville | Oktibbeha |
| Clarksdale, City of, Levee and Detention Basin | Water Quality - 401 Certification | Clarksdale | Coahoma |
| Clarksdale, City of, Levee and Detention Basin | Water Quality - 401 Certification | Clarksdale | Coahoma |
| Cleveland Air Service Inc | Water - State Operating Permit Renewal | Cleveland | Bolivar |
| Cleveland POTW | Water - NPDES Major Municipal Admin Mod | Boyle | Bolivar |
| Clinton POTW, Lovett | Water - NPDES Minor Municipal Renewal | Clinton | Hinds |
| Clinton POTW, Northeast | Water - NPDES Minor Municipal Renewal | Clinton | Hinds |
| Collinsville Water Association Inc | Water - NPDES | Collinsville | Lauderdale |
| Colonial Pipeline Company, Collins Complex | Water - NPDES Minor Industrial Renewal | Collins | Covington |
| Columbia Gulf Transmission LLC, Corinth Compressor Station | Air - Title V Renewal | Corinth | Alcorn |
| Columbia Gulf Transmission LLC, Inverness Compressor Station | Water - State Operating Permit Renewal | Inverness | Humphreys |
| Columbia POTW, North | Water - NPDES Minor Municipal Renewal | Columbia | Marion |
| Como POTW | Water - NPDES Minor Municipal Renewal | Como | Panola |
| Cooper Tire and Rubber Company, Clarksdale, a subsidiary of The Goodyear Tire and Rubber Company | Air - Title V Admin Mod | Clarksdale | Coahoma |
| Cooper Tire and Rubber Company, a wholly owned subsidiary of The Goodyear Tire and Rubber Company | Air - Construction Admin Mod | Tupelo | Lee |
| Cooper Tire and Rubber Company, a wholly owned subsidiary of The Goodyear Tire and Rubber Company | Water - Pretreatment ADMIN | Tupelo | Lee |
| Cooper Tire and Rubber Company, a wholly owned subsidiary of The Goodyear Tire and Rubber Company | Air - Title V Admin Mod | Tupelo | Lee |
| Cooperative Energy, a Mississippi electric cooperative, Benndale Peaking Station | Air - SMOP | Benndale | George |
| Culkin Water Treatment Facility | Water - NPDES Minor Industrial Renewal | Vicksburg | Warren |
| Custom Products Corporation | Water - Pretreatment ADMIN | Flowood | Rankin |
| Cutshall Funeral Home Holdings LLC | Air - Construction Permit | Iuka | Tishomingo |
| Cutting Edge Meat Company LLC | Water - State Operating Permit | Leakesville | Greene |
| DAK Americas Mississippi Inc | Water - NPDES Minor Industrial Renewal | Bay St. Louis | Hancock |
| DAK Americas Mississippi Inc | Water - Pretreatment Renewal | Bay St. Louis | Hancock |
| DR Horton, LLC, Palm Point Subdivision | Water Quality - 401 Certification | Ocean Springs | Jackson |
| Dalewood Sewer District, Plant Number 1 | Water - NPDES Minor Municipal Renewal | Lauderdale | Lauderdale |
| Danny J Dill, Rolling Acres Mobile Home Park | Water - State Operating Permit Admin Mod | Tupelo | Lee |
| Darling Ingredients Inc | Water - Pretreatment Renewal | Jackson | Hinds |
| Debra Lindsey dba DJs Fish House | Water - State Operating Permit Renewal | Sallis | Attala |
| Delek Renewables LLC | Air - SMOP Renewal | New Albany | Union |
| Delta City Utility District | Water - NPDES Minor Municipal Renewal | Delta City | Sharkey |
| Delta Energy Natchez LLC | Air - SMOP Modification | Natchez | Adams |
| Delta Protein International Inc | Water - NPDES Minor Industrial Renewal | Sunflower | Sunflower |
| Delta Terminal Inc | Air - Title V Minor Modification | Greenville | Washington |
| Denbury Onshore LLC, Brandon Pump Station | Water - NPDES Minor Industrial Renewal | Brandon | Rankin |
| Denbury Onshore LLC, Brookhaven Central Processing Facility | Water - NPDES Minor Industrial Renewal | Brookhaven | Lincoln |
| Denbury Onshore LLC, Martinville EOR Facility | Air - SMOP Modification | Mendenhall | Simpson |
| Denbury Onshore LLC, Olive Field EOR Facility | Water - NPDES Minor Industrial Renewal | Summit | Amite |
| Dixie Hills Utility District, Dixie Hills Subdivision | Water - NPDES Commercial Renewal | Laurel | Jones |
| Dixie Packaging Inc | Water - State Operating Permit Renewal | Summit | Pike |
| Dunn Roadbuilders LLC, Laurel Operations Office | Water - State Operating Permit Modification | Ellisville | Jones |
| Dutch Oil Company, Sprint Mart Number 4135 | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Dwayne Peterson, Steep Hollow Custom Slaughter | Water - State Operating Permit Renewal | Perkinston | Pearl River |
| EP Engineered Clays Corporation | Water - State Operating Permit Renewal | Jackson | Hinds |
| Ellisville POTW, North | Water - NPDES Minor Municipal Renewal | Ellisville | Jones |
| Enpro Industries Inc | Water - NPDES Minor Industrial Renewal | Water Valley | Yalobusha |
| Entergy Mississippi LLC, Gerald Andrus Plant | Air - Title V Minor Modification | Greenville | Washington |
| Entergy Mississippi LLC, Gerald Andrus Plant | Water - NPDES Major Industrial Admin Mod | Greenville | Washington |
| Enterprise Gas Processing LLC, Pascagoula Gas Processing Plant | Air - SMOP Modification | Moss Point | Jackson |
| Enterprise Gas Processing LLC, Pascagoula Gas Processing Plant | Air - SMOP Modification | Moss Point | Jackson |
| Enviva Pellets Amory LLC | Air - Title V Renewal | Amory | Monroe |
| Enviva Pellets Lucedale, LLC | Air - Construction Permit Modification | Lucedale | George |
| Enviva Pellets Lucedale, LLC | Air - Construction Permit Modification | Lucedale | George |
| Ergon Refining Inc | Air - Title V Renewal | Vicksburg | Warren |
| Eupora POTW | Water - NPDES Minor Municipal Renewal | Eupora | Webster |
| Express Grain Terminals LLC | Air - Construction Permit Modification | Greenwood | Leflore |
| FXI Inc | Air - SMOP Renewal | Verona | Lee |
| Fabricated Pipe Inc | Air - SMOP Renewal | Fernwood | Pike |
| Fazzios Car Wash Inc | Water - State Operating Permit Renewal | Gulfport | Harrison |
| Fiber Glass Systems LP, Iuka FRP Facility | Air - Title V | Iuka | Tishomingo |
| Fieldhouse Inc, The | Water - State Operating Permit Renewal | Hattiesburg | Forrest |
| Five County Child Development Program Inc, The, New Zion Head Start Center | Water - State Operating Permit Admin Mod | Bogue Chitto | Lincoln |
| Florida Gas Transmission Company LLC, Wiggins Compressor Station Number 10 | Air - Title V Renewal | Wiggins | Perry |
| Fortenberry Slaughter House Inc | Water - NPDES Minor Industrial Renewal | Carriere | Pearl River |
| Four County Gin Inc | Water - State Operating Permit Renewal | Calhoun City | Calhoun |
| Franklin Development Company LLC | Water - Pretreatment Renewal | Houston | Chickasaw |
| Freshwater Farms Products LLC | Water - NPDES Minor Industrial Renewal | Belzoni | Humphreys |
| Friars Point POTW | Water - NPDES Minor Municipal Renewal | Friars Point | Coahoma |
| Fulton POTW, West Central | Water - NPDES Minor Municipal Renewal | Fulton | Itawamba |
| G and R Fish Farms LLC | Water - NPDES Minor Industrial Renewal | Brooksville | Noxubee |
| GX Technologies LLC | Air - Construction Permit | Natchez | Adams |
| GX Technologies LLC | Water - Pretreatment | Natchez | Adams |
| Gaddy Properties and Development, Jackson Lakes Development | Water Quality - 401 Certification | Long Beach | Harrison |
| Gautier Kar Wash Inc | Water - NPDES Commercial Renewal | Gautier | Jackson |
| Georgia Pacific Monticello LLC | Air - Title V Minor Modification | Monticello | Lawrence |
| Georgia Pacific Wood Products LLC, Taylorsville | Air - Title V Renewal | Taylorsville | Smith |
| Gloster POTW | Water - NPDES Minor Municipal Renewal | Gloster | Amite |
| Goodrich Petroleum Company LLC, CMR Foster Creek 31-22 H Number 1 Production Facility | Air - Construction Permit Modification | Centreville | Wilkinson |
| Grace Covenant Church | Water - State Operating Permit Renewal | Laurel | Jones |
| Great River Utility Company LLC, Brookwood Place Subdivision | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Great River Utility Operating Company LLC, 1st Addition | Water - NPDES Commercial Admin Mod | Hattiesburg | Lamar |
| Great River Utility Operating Company LLC, Avalon Subdivision | Water - NPDES Commercial Admin Mod | Columbus | Lowndes |
| Great River Utility Operating Company LLC, Beersheba Hills Subdivision | Water - NPDES Commercial Admin Mod | Columbus | Lowndes |
| Great River Utility Operating Company LLC, Belmor Lakes Subdivision | Water - NPDES Commercial Renewal | Olive Branch | Desoto |
| Great River Utility Operating Company LLC, Black Creek Utilities | Water - State Operating Permit Admin Mod | Hattiesburg | Forrest |
| Great River Utility Operating Company LLC, Blue Lake Springs Subdivision | Water - NPDES Commercial Admin Mod | Lake Cormorant | Desoto |
| Great River Utility Operating Company LLC, Camden Place Subdivision | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Great River Utility Operating Company LLC, Carters Plantation Subdivision | Water - NPDES Commercial Admin Mod | Olive Branch | Desoto |
| Great River Utility Operating Company LLC, Cedar Creek Development | Water - NPDES Commercial Admin Mod | Natchez | Adams |
| Great River Utility Operating Company LLC, Cedarview Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Great River Utility Operating Company LLC, Centerhill Downs Subdivision | Water - NPDES Commercial Admin Mod | Olive Branch | Desoto |
| Great River Utility Operating Company LLC, College Hills Subdivision | Water - NPDES Commercial Admin Mod | Olive Branch | Desoto |
| Great River Utility Operating Company LLC, Cypress Creek Plantation | Water - NPDES Commercial Admin Mod | Olive Branch | Desoto |
| Great River Utility Operating Company LLC, Doyle Estates Subdivision | Water - NPDES Commercial Admin Mod | Columbus | Lowndes |
| Great River Utility Operating Company LLC, Edgewood Subdivision | Water - NPDES Commercial Admin Mod | Oxford | Lafayette |
| Great River Utility Operating Company LLC, Evening Shade Subdivision | Water - NPDES Commercial Admin Mod | Olive Branch | Desoto |
| Great River Utility Operating Company LLC, Fairways Subdivision | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Great River Utility Operating Company LLC, First Colony Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Great River Utility Operating Company LLC, Forest Cove Subdivision | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Great River Utility Operating Company LLC, Forrest Hills Subdivision | Water - NPDES Commercial Renewal | Oak Grove | Lamar |
| Great River Utility Operating Company LLC, Grand Oaks Subdivision | Water - NPDES Commercial Admin Mod | Starkville | Oktibbeha |
| Great River Utility Operating Company LLC, High Forest Subdivision | Water - NPDES Commercial Admin Mod | Tupelo | Lee |
| Great River Utility Operating Company LLC, Highlands Subdivision, The | Water - NPDES Commercial Admin Mod | Senatobia | Tate |
| Great River Utility Operating Company LLC, Hillcrest Subdivision | Water - NPDES Commercial Admin Mod | Columbus | Lowndes |
| Great River Utility Operating Company LLC, Hughes Estates Subdivision | Water - NPDES Commercial Admin Mod | Columbus | Lowndes |
| Great River Utility Operating Company LLC, Kerry Estates, New Hope Garden Apartments | Water - NPDES Commercial Admin Mod | Columbus | Lowndes |
| Great River Utility Operating Company LLC, King Farms Subdivision | Water - NPDES Commercial Admin Mod | Meridian | Lauderdale |
| Great River Utility Operating Company LLC, Lakeover Estates Subdivision | Water - NPDES Commercial Admin Mod | Columbus | Lowndes |
| Great River Utility Operating Company LLC, Lakes of Oxford, The | Water - NPDES Commercial Admin Mod | Oxford | Lafayette |
| Great River Utility Operating Company LLC, Lealand Pointe Subdivision | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Great River Utility Operating Company LLC, New Hope Park Subdivision | Water - NPDES Commercial Admin Mod | Columbus | Lowndes |
| Great River Utility Operating Company LLC, Openwood Plantation | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Great River Utility Operating Company LLC, Pecan Village Subdivision | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Great River Utility Operating Company LLC, Pine Woods Mobile Home Park | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Great River Utility Operating Company LLC, Reese Creek Lagoon | Water - NPDES Commercial Admin Mod | Petal | Forrest |
| Great River Utility Operating Company LLC, Ridge Park, Wakeland Hills and Wildwood Subdivisions | Water - NPDES Commercial Admin Mod | Raymond | Hinds |
| Great River Utility Operating Company LLC, Ring Road Subdivision | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Great River Utility Operating Company LLC, Roanoke Estates Subdivision | Water - NPDES Commercial Admin Mod | Columbus | Lowndes |
| Great River Utility Operating Company LLC, Sherwood Forest Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Great River Utility Operating Company LLC, Silver Leaf Development | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Great River Utility Operating Company LLC, TangleRidge Village | Water - NPDES Commercial Admin Mod | New Albany | Union |
| Great River Utility Operating Company LLC, TangleRidge Village | Water - NPDES Commercial Renewal | New Albany | Union |
| Great River Utility Operating Company LLC, Taylor Greene Subdivision | Water - NPDES Commercial Admin Mod | Taylor | Lafayette |
| Great River Utility Operating Company LLC, Trace Subdivision Number 4 | Water - NPDES Commercial Admin Mod | Hattiesburg | Lamar |
| Great River Utility Operating Company LLC, Trace Subdivision, The | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Great River Utility Operating Company LLC, Turkey Creek Subdivision | Water - NPDES Commercial Admin Mod | Olive Branch | Desoto |
| Great River Utility Operating Company LLC, Twelve Oaks Estates Subdivision | Water - NPDES Commercial Admin Mod | Oxford | Lafayette |
| Great River Utility Operating Company LLC, Wellsgate Subdivision | Water - NPDES Commercial Renewal | Oxford | Lafayette |
| Great River Utility Operating Company LLC, Wellsgate Subdivision | Water - NPDES Commercial Admin Mod | Oxford | Lafayette |
| Great River Utility Operating Company LLC, Westover West Subdivision | Water - NPDES Commercial Admin Mod | Hattiesburg | Lamar |
| Great River Utility Operating Company LLC, Windridge Subdivision | Water - NPDES Commercial Admin Mod | Hattiesburg | Lamar |
| Great River Utility Operating Company LLC, Woodall Mountain Estates | Water - NPDES Commercial Renewal | Iuka | Tishomingo |
| Great River Utility Operating Compnay LLC, Shelby Place of Oxford | Water - NPDES Commercial Admin Mod | Oxford | Lafayette |
| Greenfield Environmental Multistate Trust, LLC | Hazardous Waste - TSD Operating Modification | Meridian | Lauderdale |
| Grenada POTW | Water - NPDES Major Municipal Renewal | Grenada | Grenada |
| Gulf South Pipeline Company LLC, Kiln Compressor Station | Air - Title V Renewal | Kiln | Hancock |
| Gulf South Pipeline Company LLC, Petal Compressor Station | Air - Title V Minor Modification | Petal | Forrest |
| Gulf States Canners Inc | Water - Pretreatment Renewal | Clinton | Hinds |
| Hancock County School District, Hancock North Central Elementary School | Water - NPDES Commercial Renewal | Kiln | Hancock |
| Hancock County Water and Sewer District, Port Bienville Industrial Park | Water - NPDES Minor Industrial Renewal | Bay St. Louis | Hancock |
| Hankins Inc | Air - Title V Minor Modification | Ripley | Tippah |
| Hankins Lumber Company Inc, Elliott | Air - Construction Permit | Elliott | Grenada |
| Hankins Lumber Company Inc, Elliott | Water - Pretreatment | Elliott | Grenada |
| Hankins Timbers LLC | Air - Title V | Grenada | Grenada |
| Hardy Technologies LLC | Water - Pretreatment | Lumberton | Lamar |
| Hardy Technologies LLC, Lumberton Sawmill Complex | Water Quality - 401 Certification | Lumberton | Lamar |
| Harrison County Utility Authority, Delisle Wastewater Treatment Facility | Water - NPDES Minor Municipal Renewal | Pass Christian | Harrison |
| Harrison County Utility Authority, South Woolmarket WRRF | Water - NPDES Major Municipal Modification | Woolmarket | Harrison |
| Hazlehurst POTW, Lagoon | Water - NPDES Minor Municipal Admin Mod | Hazlehurst | Copiah |
| Hazlehurst POTW, Lagoon | Water - NPDES Minor Municipal Renewal | Hazlehurst | Copiah |
| Heritage Professional Group LLC dba McKibben and Guinn Funeral Service | Air - Construction Permit | Grenada | Grenada |
| Hickorys, The | Water - NPDES Commercial Renewal | Sardis | Panola |
| High Place Retreat, The | Water - NPDES Commercial Renewal | Florence | Simpson |
| Holcim US Inc | Water - State Operating Permit | Artesia | Lowndes |
| Homan Industries Inc | Water - NPDES Minor Industrial Renewal | Fulton | Itawamba |
| Hood Industries Inc | Air - Title V Minor Modification | Silver Creek | Lawrence |
| Hood Industries Inc, Wiggins Plywood Plant | Water - State Operating Permit Renewal | Wiggins | Stone |
| Hose R Down Car Wash LLC | Water - State Operating Permit Renewal | Steens | Lowndes |
| Huey P Stockstill LLC | Water - NPDES Minor Industrial Renewal | Picayune | Pearl River |
| Hunt Southland Refining Company LLC | Water - NPDES Minor Industrial Renewal | Heidelberg | Jones |
| Hunter Douglas Window Coverings, Inc. | Air - SMOP Renewal | Shannon | Lee |
| Hunter Engineering Company, Raymond | Water - Pretreatment Renewal | Raymond | Hinds |
| Hutson Ventures LLC, New Haven Recovery Center | Water - NPDES Commercial Admin Mod | Brookhaven | Lincoln |
| Illinois Central Railroad Company CN | Water - Pretreatment Renewal | Jackson | Hinds |
| Illinois Central Railroad Company CN, McComb Yard | Water - NPDES Minor Industrial Renewal | McComb | Pike |
| Independent Furniture Supply Company Inc | Air - Title V Renewal | Tupelo | Lee |
| Ingalls Shipbuilding, Comynie Bayou Pier and Kayak Lauch | Water Quality - 401 Certification | Pascagoula | Jackson |
| Interfor US Inc, Bay Springs Division | Air - Title V Admin Mod | Bay Springs | Jasper |
| Interfor US Inc, Bay Springs Division | Water - NPDES Minor Industrial Admin Mod | Bay Springs | Jasper |
| International Paper Company, Columbus Modified Fiber Plant | Water - Pretreatment Modification | Columbus | Lowndes |
| International Paper Company, Columbus Modified Fiber Plant | Air - Title V Renewal | Columbus | Lowndes |
| International Paper Company, Houston | Air - SMOP Renewal | Houston | Chickasaw |
| International Paper Company, Richland Facility | Air - SMOP Modification | Richland | Rankin |
| International Paper Company, Richland Facility | Water - Pretreatment ADMIN | Richland | Rankin |
| International Paper Company, Vicksburg Mill | Air - Title V Renewal | Redwood | Warren |
| JJC Enterprises Inc, Oakland Ridge Duplexes | Water - State Operating Permit Renewal | Petal | Forrest |
| Jack Batte and Sons Inc | Air - Title V Modification | Forest | Smith |
| Jackson Board of Supervisors, Old Fort Bayou Dredging | Water Quality - 401 Certification | Ocean Springs | Jackson |
| Jackson Board of Supervisors, Old Fort Bayou Dredging | Water Quality - 401 Certification | Ocean Springs | Jackson |
| Jackson County Board of Supervisors, Singing River Health System | Air - SMOP Renewal | Pascagoula | Jackson |
| Jackson County Port Authority, Bayou Casotte Water Treatment Plant | Water - State Operating Permit Renewal | Moss Point | Jackson |
| Jackson County Utility Authority, POTW 1C | Water - State Operating Permit Renewal | Ocean Springs | Jackson |
| Jackson County Utility Authority, POTW 2C | Water - NPDES Major Municipal Renewal | Gautier | Jackson |
| Jackson County Utility Authority, POTW 7C | Water - NPDES Major Municipal Renewal | Pascagoula | Jackson |
| Jackson POTW, Savanna Street | Water - NPDES Major Municipal Renewal | Jackson | Hinds |
| Jackson POTW, Trahon and Big Creek Wastewater Treatment Facility | Water - NPDES Major Municipal Renewal | Jackson | Hinds |
| Jackson POTW, Trahon and Big Creek Wastewater Treatment Facility | Water - NPDES Major Municipal Admin Mod | Jackson | Hinds |
| Jaxon Energy LLC, Jaxon Energy Processing Plant | Water - NPDES Storm Renewal | Jackson | Hinds |
| Jefferson Davis County Board of Supervisors, Jefferson Davis County Class I Rubbish Site | Solid Waste - Rubbish Modification | Prentiss | Jefferson Davis |
| John Fortenberrys Meat Plant LLC | Water - NPDES Minor Industrial Admin Mod | Sandy Hook | Walthall |
| Johnson Camper Carwash LLC | Water - NPDES Commercial Renewal | Hazlehurst | Copiah |
| Jones County Schools, Glade Elementary | Water - NPDES Commercial Renewal | Laurel | Jones |
| Jones County Schools, Northeast Jones High School | Water - NPDES Commercial Renewal | Laurel | Jones |
| Jones County Schools, Shady Grove Attendance Center | Water - NPDES Commercial Renewal | Laurel | Jones |
| Jones County Schools, West Jones High School | Water - NPDES Commercial Renewal | Laurel | Jones |
| Julie's Pasture to Plate Meat Market and Processing LLC | Water - State Operating Permit | Lumberton | Pearl River |
| Jumpertown, Town of, WWTF | Water - NPDES Minor Municipal Renewal | Jumpertown | Prentiss |
| Kemira Chemicals Inc | Air - SMOP Renewal | Aberdeen | Monroe |
| Kemira Chemicals Inc | Air - SMOP Modification | Aberdeen | Monroe |
| Kohler Company, Hattiesburg Engine Plant | Air - SMOP Modification | Hattiesburg | Forrest |
| Kohler Company, Hattiesburg Engine Plant Number 2 | Air - Title V Modification | Hattiesburg | Forrest |
| Kohler Company, Hattiesburg Engine Plant Number 2 | Air - Title V Modification | Hattiesburg | Forrest |
| Lake Ruth RV Park | Water - State Operating Permit Renewal | French Camp | Choctaw |
| Land Sales LLC, Shady Cove RV Park, Phase 2 | Water - State Operating Permit | Hattiesburg | Forrest |
| Lauderdale County Landfill LLC | Solid Waste - Rubbish ADMIN | Toomsuba | Lauderdale |
| Leaf River Cellulose LLC | Air - Title V Modification | New Augusta | Perry |
| Leonards Cypress Landing Inc | Water - State Operating Permit Renewal | Summit | Pike |
| Liberty Fuels Company LLC, North American Coal Corporation, Liberty Fuels Mine | Water - NPDES Minor Industrial Renewal | DeKalb | Kemper |
| Linde Inc | Water - NPDES Minor Industrial Renewal | Brandon | Rankin |
| Lipscomb Oil Company Inc, Filling Station #16, The | Water - NPDES Commercial Renewal | Greenville | Washington |
| Lockheed Martin Space Operations LLC, Propulsion Manufacturing Center | Water - Pretreatment | Stennis Space Center | Hancock |
| Louis Dreyfus Company River Elevators LLC, Port of Rosedale, River Elevator | Air - SMOP Modification | Rosedale | Bolivar |
| Loves Travel Stops and Country Stores Inc, Number 343 | Water - NPDES Commercial Renewal | Toomsuba | Lauderdale |
| Lyon POTW | Water - NPDES Minor Municipal Renewal | Lyon | Coahoma |
| M and M Processing LLC | Water - Pretreatment | Biloxi | Harrison |
| M and M Processing LLC | Water - Pretreatment ADMIN | Biloxi | Harrison |
| MC Environmental LLC, MC Environmental Class I Rubbish Facility | Solid Waste - Rubbish | Columbia | Marion |
| MDOT, Highway 78, Welcome Center, Itawamba | Water - NPDES Commercial Renewal | Tremont | Itawamba |
| MDOT, Interstate 10 Welcome Center | Water - NPDES Commercial Renewal | Moss Point | Jackson |
| MDOT, Louisville Maintenance Headquarters | Water - State Operating Permit Renewal | Louisville | Winston |
| MGC Terminal LLC | Air - SMOP Modification | Meridian | Lauderdale |
| MS District UPC Camp Grounds | Water - NPDES Commercial Renewal | Raymond | Hinds |
| MSARNG, Camp McCain Training Center | Air - SMOP Renewal | Elliott | Grenada |
| MSARNG, Camp Shelby Joint Forces Training Center | Water - NPDES Major Municipal Renewal | Camp Shelby | Forrest |
| MTD Products Company | Water - Pretreatment Modification | Verona | Lee |
| Macon Treating Company | Water - NPDES Storm Renewal | Macon | Noxubee |
| Magnolia Hills Inc, Magnolia Hills Mobile Home Park | Water - NPDES Commercial Renewal | Nesbit | Desoto |
| Magnolia Spring Assembly of God Church | Water - State Operating Permit Renewal | Moss Point | Jackson |
| Main Street Taylor LLC | Water - NPDES Commercial Renewal | Taylor | Lafayette |
| Marietta POTW, HCR Lagoon | Water - NPDES Minor Municipal Renewal | Marietta | Prentiss |
| Mars Food US, LLC | Air - SMOP | Greenville | Washington |
| Martinez, Henry, Private Residence | Water Quality - 401 Certification | Bay St. Louis | Hancock |
| Maryland Heights Homeowners Association, Maryland Heights Subdivision | Water - NPDES Commercial Renewal | Yazoo | Yazoo |
| Maxwell Flying Service Inc | Water - State Operating Permit Renewal | Benoit | Bolivar |
| Meadville POTW | Water - NPDES Minor Municipal Renewal | Meadville | Franklin |
| Misfits Offroad and RV Park LLC | Water - State Operating Permit Renewal | Perkinston | Hancock |
| Mississippi Action for Progress Inc, Lexie Head Start, Early Head Start Center | Water - NPDES Commercial Admin Mod | Tylertown | Walthall |
| Mississippi Action for Progress Inc, Yale Headstart Center | Water - NPDES Commercial Admin Mod | Magnolia | Pike |
| Mississippi Department of Marine Resources, Singing River Island Artificial Research Reef | Water Quality - 401 Certification | Pascagoula | Jackson |
| Mississippi Department of Marine Resources, St. Louis Bay Oyster | Water Quality - 401 Certification | Pass Christian | Harrison |
| Mississippi Department of Marine Resources, USM ERDC Experimental Oyster Reef | Water Quality - 401 Certification | Biloxi | Harrison |
| Mississippi Department of Wildlife Fisheries and Parks, Kemper County Lake | Water - NPDES Commercial Renewal | DeKalb | Kemper |
| Mississippi Department of Wildlife, Fisheries and Parks, Paul B Johnson State Park | Water - NPDES Commercial Renewal | Hattiesburg | Forrest |
| Mississippi Lignite Mining Company | Water - NPDES Minor Industrial Modification | Ackerman | Choctaw |
| Mississippi Lime Company, dba Falco Lime | Air - SMOP Modification | Vicksburg | Warren |
| Mississippi Power Company, Operations Center | Air - SMOP Renewal | Gulfport | Harrison |
| Mississippi Power Company, Plant Jack Watson | Water - NPDES Major Industrial Renewal | Gulfport | Harrison |
| Mississippi State Penitentiary POTW, Number 1 | Water - NPDES Minor Municipal Renewal | Parchman | Sunflower |
| Mississippi State Penitentiary POTW, Number 2 | Water - NPDES Minor Municipal Renewal | Parchman | Sunflower |
| Mississippi University for Women, Plymouth Bluff Nature Center | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Monroe County Board of Supervisors, Monroe County Class I Rubbish Site | Solid Waste - Rubbish Modification | Aberdeen | Monroe |
| Monticello, Town of, Atwood Water Park | Water - State Operating Permit Renewal | Monticello | Lawrence |
| Morning Glory Property LLC, dba Soap and Suds Bay Wash | Water - NPDES Commercial Renewal | Clinton | Hinds |
| Moss Point Reverse Osmosis Water Plant | Water - NPDES Minor Industrial Renewal | Moss Point | Jackson |
| Mueller Casting and Copper Tube Products | Air - Title V Renewal | Fulton | Itawamba |
| Nanocor LLC | Air - Title V Renewal | Aberdeen | Monroe |
| National Warmwater Aquaculture Center, Delta Branch Experiment Station | Water - NPDES Minor Industrial Renewal | Stoneville | Washington |
| Nellie Alston dba Sawmill Cafe | Water - State Operating Permit Renewal | Lucedale | Greene |
| New Albany POTW | Water - NPDES Major Municipal Admin Mod | New Albany | Union |
| New Albany POTW | Water - NPDES Major Municipal | New Albany | Union |
| New Augusta POTW | Water - NPDES Minor Municipal Renewal | New Augusta | Perry |
| New Hope Missionary Baptist Church | Water - NPDES Commercial Renewal | Natchez | Adams |
| Niagara Bottling LLC | Water - Pretreatment Renewal | Byhalia | Marshall |
| Nidec Motor Corporation | Air - SMOP Renewal | Southaven | Desoto |
| Nissan North America Inc, Canton Manufacturing Facility | Water - Pretreatment Renewal | Canton | Madison |
| Noble Carwash LLC | Water - NPDES Commercial Renewal | Pass Christian | Hancock |
| Norbertine Priory of St Moses The Black, The | Water - State Operating Permit Renewal | Raymond | Hinds |
| North Central Baptist Association Inc, dba Lakeside Baptist Assembly, Camp Lakeside | Water - State Operating Permit Renewal | Scobey | Tallahatchie |
| North Mississippi Medical Center Inc | Air - Title V Renewal | Tupelo | Lee |
| North Tishomingo County Utility Service Inc | Water - State Operating Permit Renewal | Iuka | Tishomingo |
| Noxubee County Producers Inc, Superior Fish Products | Water - NPDES Minor Industrial Renewal | Macon | Noxubee |
| Nucor Steel Jackson Inc | Water - Pretreatment ADMIN | Flowood | Rankin |
| O B Curtis Water Treatment Plant | Water - NPDES Minor Industrial Renewal | Ridgeland | Madison |
| O Town Properties LLC | Water - State Operating Permit Renewal | Oxford | Lafayette |
| Oakview Utility Company Inc, Rowan Oak Subdivision | Water - NPDES Commercial Renewal | Terry | Hinds |
| Oil Dri Production Company | Air - Title V Modification | Ripley | Tippah |
| Olin Winchester LLC | Air - SMOP Renewal | Oxford | Lafayette |
| Omega Protein, Inc | Air - SMOP Modification | Moss Point | Jackson |
| Osyka POTW | Water - NPDES Minor Municipal Renewal | Osyka | Pike |
| PACCAR Engine Company | Air - SMOP Renewal | Columbus | Lowndes |
| PACCAR Engine Company | Water - Pretreatment Renewal | Columbus | Lowndes |
| PG Technologies LLC | Air - SMOP | Ellisville | Jones |
| PG Technologies LLC | Water - Pretreatment Renewal | Ellisville | Jones |
| PROFILE Products LLC | Air - Title V Renewal | Blue Mountain | Tippah |
| Palmer Machine Works Inc | Air - SMOP Renewal | Amory | Monroe |
| Paradise Ranch LLC, Paradise Ranch RV Resort | Water - NPDES Commercial | Tylertown | Walthall |
| Patrick Industries Inc dba Baymont Inc, Line Number 3 | Air - Construction Permit | Belmont | Tishomingo |
| Pearl River Foods LLC | Water - Pretreatment Renewal | Carthage | Leake |
| Pecan Grove Trailer Park | Water - NPDES Commercial Renewal | Hattiesburg | Lamar |
| Peco Foods Inc, Lake Feed Mill | Air - SMOP Renewal | Lake | Newton |
| Peco Foods Inc, West Point Plant | Water - Pretreatment ADMIN | West Point | Clay |
| Peco Foods Inc, West Point Plant | Water - Pretreatment Modification | West Point | Clay |
| Penske Truck Leasing Company LP | Water - Pretreatment Renewal | Jackson | Hinds |
| Pesticide General Permit | Water - NPDES Renewal | | Value Needed |
| Phillip Odom, Rose Lane Mobile Home Park | Water - State Operating Permit Renewal | Laurel | Jones |
| Pine Belt Crematory LLC | Air - Construction Permit | Hattiesburg | Forrest |
| Planters Air Service Inc | Water - State Operating Permit Renewal | Alligator | Bolivar |
| Platte Chemical Co dba Loveland Products | Air - SMOP Modification | Greenville | Washington |
| Plumrose USA Inc dba Swift Prepared Foods | Water - Pretreatment ADMIN | Booneville | Prentiss |
| Poplar Springs Nursing Center, LLC | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Port Gibson POTW | Water - NPDES Minor Municipal Renewal | Port Gibson | Claiborne |
| PowerChem Inc | Water - Pretreatment | Natchez | Adams |
| PowerChem Inc | Air - Construction Permit | Natchez | Adams |
| Prairie Land Water Association Inc, Arbor Walk Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Precision Spine Inc | Water - Pretreatment ADMIN | Pearl | Rankin |
| Producers Rice Mill Inc | Water - Pretreatment Renewal | Greenville | Washington |
| Quitman Pellets LLC | Air - Title V | Quitman | Clarke |
| Quitman Pellets LLC | Air - Construction Admin Mod | Quitman | Clarke |
| RHHK LLC, D Iberville Car Wash | Water - NPDES Commercial Renewal | D'Iberville | Harrison |
| Rainbow Bridge Pet Crematory LLC | Air - Construction Permit | Bailey | Lauderdale |
| Raleigh POTW | Water - NPDES Minor Municipal Renewal | Raleigh | Smith |
| Rex Lumber, Brookhaven LLC | Air - Title V Renewal | Brookhaven | Lincoln |
| Rienzi POTW | Water - NPDES Minor Municipal Renewal | Rienzi | Alcorn |
| Ripley Cremation Services LLC | Air - Construction Permit | Ripley | Tippah |
| Roxul USA Inc | Air - Construction PSD modification | Byhalia | Marshall |
| Roxul USA Inc | Air - Title V | Byhalia | Marshall |
| Roy Lane, Chateau Lane Apartments | Water - NPDES Commercial Admin Mod | Starkville | Oktibbeha |
| SAIPEM America Inc, SAIPEM Pascagoula Operations | Air - Construction Permit | Pascagoula | Jackson |
| SMW Mfg, Inc | Water - Pretreatment ADMIN | Oxford | Lafayette |
| Salvation Army, The, Camp Hidden Lake | Water - NPDES Commercial Renewal | Lexington | Holmes |
| Sanderson Farms Inc, Foods Division | Water - Pretreatment ADMIN | Flowood | Rankin |
| Sandersville POTW | Water - NPDES Minor Municipal Renewal | Sandersville | Jones |
| Saunders Midwest LLC | Air - Construction Permit | Meridian | Lauderdale |
| Schlater POTW | Water - NPDES Minor Municipal Renewal | Schlater | Leflore |
| Scott Petroleum Corporation, Greenville Facility | Water - Pretreatment Renewal | Greenville | Washington |
| Scranton Manufacturing Company Inc dba McLaughlin Family Companies Inc, NewWay | Water - Pretreatment | Booneville | Prentiss |
| Senatobia, City of, Back Acres Subdivision | Water - NPDES Commercial Admin Mod | Senatobia | Tate |
| Sequa Corporation, dba Precoat Metals | Air - Title V | Jackson | Hinds |
| Sherman POTW, Activated Sludge Facility | Water - NPDES Minor Municipal Renewal | Sherman | Pontotoc |
| Shuqualak POTW | Water - NPDES Minor Municipal Renewal | Shuqualak | Noxubee |
| Signal LLC, Beard 29-7 Number 1 Tank Battery | Air - Title V | Waynesboro | Wayne |
| Signet Maritime Corporation, Signet Shipbuilding and Repair | Air - SMOP Renewal | Pascagoula | Jackson |
| Silver City POTW | Water - NPDES Minor Municipal Renewal | Silver City | Humphreys |
| Simpson County School District, Pinola Head Start Center | Water - NPDES Commercial Renewal | Pinola | Simpson |
| Skylane Holdings LLC, Skylane Mobile Home Park | Water - NPDES Commercial Renewal | Walls | Desoto |
| Solero Technologies LLC | Water - Pretreatment ADMIN | Water Valley | Yalobusha |
| South Mississippi Funeral Services LLC, Capps Funeral Home | Air - Construction Permit | Tylertown | Walthall |
| Southeastern Railway Services | Air - SMOP Renewal | Magnolia | Pike |
| Southern Natural Gas Company LLC, Pickens Compressor Station | Water - State Operating Permit Renewal | Pickens | Yazoo |
| Southern Natural Gas Company LLC, Rankin Compressor Station | Air - Title V Renewal | Brandon | Rankin |
| Southwire Company LLC | Air - SMOP Renewal | Starkville | Oktibbeha |
| Starling Construction Company Inc, Sweet Water Subdivision | Water - State Operating Permit Renewal | Saltillo | Lee |
| Steel Dynamics Columbus LLC | Water - NPDES Minor Industrial Renewal | Columbus | Lowndes |
| Stella Jones Corporation | Water - State Operating Permit | Scooba | Kemper |
| Stericycle Inc, Stericycle Canton | Solid Waste - Processing Renewal | Canton | Madison |
| Steve Rodgers dba Rodgers Air Service | Water - State Operating Permit Renewal | Belzoni | Humphreys |
| Stewart, Thomas, Private Access Road Gulf Haven Subdivision | Water Quality - 401 Certification | Gulfport | Harrison |
| Summit POTW, South | Water - NPDES Minor Municipal Renewal | Summit | Pike |
| Sun Air Products Inc dba Yellow Creek Coating Service | Air - SMOP Renewal | Iuka | Tishomingo |
| Sunnyhill Water Association | Water - NPDES Minor Municipal Admin Mod | McComb | Pike |
| Syntron Material Handling LLC | Air - SMOP Renewal | Saltillo | Lee |
| Systems Electro Coating LLC | Water - Pretreatment Renewal | Madison | Madison |
| T May Company Inc, TMCO Class I Rubbish Site | Solid Waste - Rubbish ADMIN | Saltillo | Lee |
| T and R Management LLC, Robert E Smith Trailer Park | Water - State Operating Permit Renewal | Hattiesburg | Forrest |
| TMJ LLC | Water - NPDES Commercial Renewal | Brandon | Rankin |
| TVA Caledonia Combined Cycle Plant | Water - Pretreatment Renewal | Caledonia | Lowndes |
| Taylor Jersey Farm Inc | Water - State Operating Permit Renewal | Booneville | Prentiss |
| Taylor Power Systems Inc, Richland | Water - Pretreatment Modification | Richland | Rankin |
| Taylors Flying Service Inc | Water - State Operating Permit Renewal | Bolton | Hinds |
| Taylorsville POTW | Water - NPDES Minor Municipal Renewal | Taylorsville | Smith |
| Tellus Operating Group LLC, Raleigh CO2 Plant | Air - Title V Minor Modification | Raleigh | Smith |
| Tellus Operating Group LLC, Tallahala 4-7 Number 1 Tank Battery | Air - Title V Renewal | Sylvarena | Smith |
| Tellus Operating Group LLC, Trenton Plant | Air - Title V Renewal | Raleigh | Smith |
| Tennessee Gas Pipeline Company LLC, Bay St Louis Compressor Station Number 530 | Air - Title V Renewal | Bay St. Louis | Hancock |
| Tennessee Gas Pipeline Company LLC, Isola Compressor Station Number 843 | Water - State Operating Permit Renewal | Isola | Humphreys |
| Tennessee Gas Pipeline Company LLC, Purvis Compressor Station Number 534 | Water - NPDES Minor Industrial Renewal | Purvis | Forrest |
| Texas Eastern Transmission LP, Clinton Compressor Station | Water - NPDES Minor Industrial Renewal | Jackson | Hinds |
| Tishomingo Acquisition LLC, dba TBEI, Tishomingo | Air - Title V Renewal | Tishomingo | Tishomingo |
| Tishomingo County Board of Supervisors, Tri State Commerce Park | Water - NPDES Minor Industrial Renewal | Iuka | Tishomingo |
| Tishomingo POTW | Water - NPDES Minor Municipal Renewal | Tishomingo | Tishomingo |
| Topline Manufacturing Company Inc | Air - SMOP Renewal | Tremont | Itawamba |
| Transcontinental Gas Pipeline Company LLC, Station 70 | Water - NPDES Minor Industrial Renewal | Tylertown | Walthall |
| Trash Doctors LLC, Medical Waste Processing Facility | Solid Waste - Processing ADMIN | Bay St. Louis | Hancock |
| True Temper Sports Inc | Water - NPDES Minor Industrial Renewal | Amory | Monroe |
| Trunkline Gas Company LLC, Shaw Compressor Station | Air - Title V Renewal | Shaw | Bolivar |
| Trunkline Gas Company, LLC, Independence Compressor Station | Air - Title V Renewal | Coldwater | Tate |
| US Army COE, Memphis District, Mississippi River Maintenance Dredging | Water Quality - 401 Certification | Tunica | Tunica |
| US Army COE, Stennis East Bank Park | Water - State Operating Permit Renewal | Aberdeen | Monroe |
| US Army COE, Waverly Ferry Recreation Area | Water - State Operating Permit Renewal | West Point | Clay |
| US Navy, Naval Construction Battalion Center | Air - SMOP Renewal | Gulfport | Harrison |
| University of Mississippi Medical Center | Water - NPDES Minor Industrial Modification | Jackson | Hinds |
| University of Mississippi Medical Center | Air - SMOP Modification | Jackson | Hinds |
| Utility Services LLC, Dogwood Lake Estates | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Utility Services LLC, Sunset Subdivision | Water - NPDES Commercial Renewal | Starkville | Oktibbeha |
| Vaiden POTW | Water - NPDES Minor Municipal Renewal | Vaiden | Carroll |
| Valley Air Applicators | Water - State Operating Permit Renewal | Indianola | Sunflower |
| W E Blain and Sons Inc, Mt Olive Shop | Water - State Operating Permit Admin Mod | Mount Olive | Covington |
| W E Blain and Sons Inc, Mt Olive Shop | Water - State Operating Permit Admin Mod | Mount Olive | Covington |
| W E Blain and Sons Inc, Natchez Office and Shop | Water - State Operating Permit Admin Mod | Natchez | Adams |
| W E Blain and Sons Inc, Natchez Office and Shop | Water - State Operating Permit Admin Mod | Natchez | Adams |
| Wade Services Inc | Water - Pretreatment Renewal | Laurel | Jones |
| Wade Services Inc | Air - SMOP Renewal | Laurel | Jones |
| Warmkraft Inc | Water - Pretreatment Renewal | Taylorsville | Smith |
| Warren Paving Inc, Gulfport Plant | Air - SMOP Renewal | Gulfport | Harrison |
| Warren Paving Inc, Gulfport Plant | Water Quality - 401 Certification | Gulfport | Harrison |
| Waste Oil Collectors Inc | Water - Pretreatment Renewal | Gautier | Jackson |
| Waste Water Solutions LLC, Eagle Point | Water - NPDES Commercial Admin Mod | Collinsville | Lauderdale |
| Wastequip Manufacturing Company LLC | Air - SMOP Renewal | Brookhaven | Lincoln |
| Water Valley POTW | Water - NPDES Major Municipal Modification | Water Valley | Yalobusha |
| Water Way Inc, Paul Edmondson Road Facility | Air - Title V Renewal | Iuka | Tishomingo |
| Waters International Trucks Inc | Water - NPDES Commercial Renewal | Washington | Adams |
| Wendy Oaks R V Resort Inc | Water - NPDES Commercial Renewal | Florence | Rankin |
| Wepfer Marine of Greenville LLC | Water - Pretreatment Renewal | Greenville | Washington |
| Westlake Compounds LLC dba Westlake Global Compounds, Gallman | Water - NPDES Minor Industrial Renewal | Hazlehurst | Copiah |
| Westport Linen Services LLC | Water - Pretreatment ADMIN | Greenville | Washington |
| Westside Estates Homeowners Association | Water - NPDES Commercial Renewal | Brookhaven | Lincoln |
| Wet Deck Log Spray General Permit | Water - NPDES Renewal | Jackson | Hinds |
| Weyerhaeuser NR Company, Bruce Facility | Air - Air-Construction PSD | Bruce | Calhoun |
| Weyerhaeuser NR Company, Bruce Facility | Water - Pretreatment | Bruce | Calhoun |
| Weyerhaeuser NR Company, Bruce Facility | Water - NPDES Minor Industrial Modification | Bruce | Calhoun |
| Weyerhaeuser NR Company, McComb Wood Products | Water - Pretreatment Renewal | Magnolia | Pike |
| Weyerhaeuser NR Company, McComb Wood Products | Air - Title V Minor Modification | Magnolia | Pike |
| Weyerhaeuser NR Company, Philadelphia Facility | Water - Pretreatment Renewal | Philadelphia | Neshoba |
| Winston Plywood and Veneer LLC | Air - Title V Modification | Louisville | Winston |
| Winston Plywood and Veneer LLC | Air - Title V Modification | Louisville | Winston |
| Wolf River Ranch Resort | Water - NPDES Commercial Renewal | Lumberton | Pearl River |
| Wood Preserving Inc | Water - Pretreatment Renewal | Brookhaven | Lincoln |
| Yazoo City Public Service Commission | Water - Pretreatment Renewal | Yazoo City | Yazoo |
| Zavation LLC | Water - Pretreatment ADMIN | Flowood | Rankin |
| Zavation LLC | Water - Pretreatment Modification | Flowood | Rankin |