| 24 Hour Storage, LLC, Commercial Development | Water Quality - 401 Certification | Ocean Springs | Jackson |
| A Da Hi Utility Inc | Water - NPDES Commercial Renewal | Aberdeen | Monroe |
| ABB Motors and Mechanical Inc | Water - State Operating Permit Renewal | Columbus | Lowndes |
| ACCO Brands USA LLC | Air - SMOP Renewal | Booneville | Prentiss |
| AITX Railcar Services LLC, Brookhaven Facility | Air - Construction Permit Modification | Brookhaven | Lincoln |
| ANR Pipeline Company, Greenville Compressor Station | Air - Title V Renewal | Greenville | Washington |
| APAC MISSISSIPPI, INC BACCO MINE | Water - State Operating Permit Admin Mod | Columbus | Lowndes |
| APAC MISSISSIPPI, INC BAILEY ROAD SHOP | Water - State Operating Permit Admin Mod | Georgetown | Copiah |
| APAC MISSISSIPPI, INC MOUNT OLIVE SHOP | Water - State Operating Permit Admin Mod | Mount Olive | Covington |
| APAC MISSISSIPPI, INC NATCHEZ SHOP | Water - State Operating Permit Admin Mod | Natchez | Adams |
| AVM 104 LLC | Water - NPDES Commercial Renewal | Picayune | Hancock |
| Abbeville POTW | Water - NPDES Minor Municipal Renewal | Abbeville | Lafayette |
| Adams County Water Association, Foresite Subdivision | Water - NPDES Commercial Renewal | Natchez | Adams |
| Adams County Water Association, Highland North Subdivision | Water - NPDES Commercial Renewal | Natchez | Adams |
| Adams County Water Association, La Grange Heights Subdivision | Water - NPDES Commercial Renewal | Natchez | Adams |
| Akers Railroad Holdings, LLC, Chipper Yard | Air - Construction Permit | Amory | Monroe |
| Aluminum Dynamics, LLC | Water Quality - 401 Certification | Columbus | Lowndes |
| Amalgamated LLC, Mables Carwash | Water - State Operating Permit Renewal | Holly Springs | Marshall |
| American Credit Corporation of Mississippi LLC, Pine Lakes Mobile Home Park Inc | Water - NPDES Commercial Renewal | Clinton | Hinds |
| Americlean LLC | Solid Waste - Processing | Picayune | Pearl River |
| Amick Farms LLC | Air - SMOP Renewal | Laurel | Jones |
| Anderson Construction, Cedar Lake Commercial Development | Water Quality - 401 Certification | Biloxi | Harrison |
| Anguilla POTW | Water - NPDES Minor Municipal Renewal | Anguilla | Sharkey |
| Arbor View LLC, Arbor View Apartments | Water Quality - 401 Certification | D'Iberville | Harrison |
| Ardagh Metal Packaging USA Corp | Air - Title V Renewal | Olive Branch | Desoto |
| Ashland POTW, East | Water - NPDES Minor Municipal Renewal | Ashland | Benton |
| B and D Plastics LLC | Air - Title V Renewal | Gautier | Jackson |
| BB Recycling, LLC | Solid Waste - Rubbish ADMIN | Crystal Springs | Copiah |
| BCS Development Company, Roderick Griffin Street East | Water Quality - 401 Certification | Brandon | Rankin |
| BFI Waste Systems of Mississippi LLC, Big River Landfill | Solid Waste - Mun Landfill Renewal | Leland | Washington |
| Bakelite Chemicals LLC, Taylorsville | Water - Pretreatment ADMIN | Taylorsville | Smith |
| Bakelite Chemicals LLC, Taylorsville | Water - NPDES Storm Renewal | Taylorsville | Smith |
| Bakelite Chemicals LLC, Taylorsville | Air - Title V Renewal | Taylorsville | Smith |
| Baldwyn POTW | Water - NPDES Minor Municipal Renewal | Baldwyn | Lee |
| Batesville, City of, Heafner Class II Rubbish Site | Solid Waste - Rubbish Modification | Batesville | Panola |
| Baxter Healthcare Corporation | Air - SMOP Modification | Cleveland | Bolivar |
| Baxter Healthcare Corporation, Mt Carmel Global Logistics Center | Water - Pretreatment | Byhalia | Marshall |
| Bentcreek Utilities, Heritage Subdivision | Water - State Operating Permit Renewal | Hattiesburg | Lamar |
| Bentonia POTW | Water - NPDES Minor Municipal Renewal | Bentonia | Yazoo |
| Bernard Bayou Industrial District | Water - NPDES Minor Industrial Renewal | Gulfport | Harrison |
| Bethel Temple Pentecostal Church Inc | Water - State Operating Permit Renewal | Brookhaven | Lincoln |
| Beulah POTW | Water - NPDES Minor Municipal Renewal | Beulah | Bolivar |
| Biloxi, City of, Beach Renourishment Front Beach | Water Quality - 401 Certification | Biloxi | Harrison |
| Biloxi, Ciy of, Lighthouse Park and Visitor Center | Water Quality - 401 Certification | Biloxi | Harrison |
| Blackland Water Association System, Golden Acres Subdivision | Water - NPDES Commercial Renewal | Booneville | Prentiss |
| BlueScope Coated Products LLC | Air - Title V Admin Mod | Jackson | Hinds |
| BlueScope Coated Products LLC | Water - Pretreatment ADMIN | Jackson | Hinds |
| Bluff Creek Campgrounds Inc | Water - State Operating Permit Renewal | Vancleave | Jackson |
| Bollinger Mississippi Repair, LLC | Air - Title V Admin Mod | Pascagoula | Jackson |
| Bollinger Mississippi Repair, LLC | Air - Title V Renewal | Pascagoula | Jackson |
| Bollinger Mississippi Shipbuilding, LLC | Air - Title V Admin Mod | Pascagoula | Jackson |
| Boondock Eddies LLC | Water - NPDES Commercial Renewal | Waynesboro | Wayne |
| Booneville POTW | Water - NPDES Major Municipal Renewal | Booneville | Prentiss |
| Boyle Flying Service Inc | Water - State Operating Permit Renewal | Boyle | Bolivar |
| Bradford OKeefe Funeral Homes, Inc (dba Mississippi Gulf Coast Crematory) | Air - Construction Permit | D'Iberville | Harrison |
| Briar Creek Utilities LLC | Water - NPDES Commercial Renewal | Starkville | Oktibbeha |
| BroomeCo Inc dba Nelsons Utility | Water - NPDES Commercial Renewal | Hattiesburg | Lamar |
| Browning Creek Neighborhood Utility Service Inc | Water - NPDES Commercial Renewal | Starkville | Oktibbeha |
| Buffalo Services Inc, B Kwik Number 3 | Water - State Operating Permit Renewal | Natchez | Adams |
| C L Dews and Sons Foundry and Machinery Company Inc | Air - SMOP Modification | Hattiesburg | Forrest |
| C T Custom Meats LLC | Water - State Operating Permit | Lucedale | George |
| CAM2 International LLC | Water - NPDES Minor Industrial Renewal | Vicksburg | Warren |
| Calbee North America LLC, Harvest Snap Facility | Water - Pretreatment | Senatobia | Tate |
| Calgon Carbon Corporation | Water - NPDES Minor Industrial Modification | Bay St. Louis | Hancock |
| Capital Investors LLC, Country Place Rentals | Water - State Operating Permit Renewal | Kosciusko | Attala |
| Carlisle Construction Materials LLC, Carlisle SynTec Systems, Plant 9 | Air - SMOP Renewal | Senatobia | Tate |
| Carolyn Nicholson, The Reel Steakhouse Restaurant | Water - State Operating Permit Renewal | Lucedale | George |
| Cartlidge Family Partners LP, Longleaf Acres Subdivision | Water - NPDES Commercial Renewal | Petal | Forrest |
| Cary POTW | Water - NPDES Minor Municipal Renewal | Cary | Sharkey |
| Castle Energy Equipment, LLC | Water - State Operating Permit Renewal | Meridian | Clarke |
| Caterpillar Inc | Water - Pretreatment Modification | Corinth | Alcorn |
| Cavenham Forest Industries LLC | Hazardous Waste - TSD Post-Closure Renewal | Gulfport | Harrison |
| Central Hinds Academy | Water - NPDES Commercial Renewal | Raymond | Hinds |
| Centreville POTW, South | Water - NPDES Minor Municipal Renewal | Centreville | Wilkinson |
| Charles W McMaster dba Poole Subdivision | Water - NPDES Commercial Renewal | Terry | Hinds |
| Chute, LLC, Creekmore Green Tree Reservoir | Water Quality - 401 Certification | Eagle Lake | Warren |
| Claiborne County Board of Supervisors, Hermanville Facility | Water - NPDES Minor Municipal Renewal | Hermanville | Claiborne |
| Clarksdale POTW | Water - NPDES Major Municipal Renewal | Clarksdale | Coahoma |
| Clinton Briars POTW | Water - NPDES Minor Municipal Renewal | Clinton | Hinds |
| Clinton POTW, Lovett | Water - NPDES Minor Municipal Modification | Clinton | Hinds |
| Collins POTW | Water - NPDES Minor Municipal Renewal | Collins | Covington |
| Collinsville MS LLC, DBA Corner Market | Water - NPDES Commercial Admin Mod | Collinsville | Lauderdale |
| Colonial Pipeline Company, Collins Complex | Air - Title V Renewal | Collins | Covington |
| Columbia, City of, Mississippi, R.A. Johnson Sports Complex | Water Quality - 401 Certification | Columbia | Marion |
| Columbus Christian Academy Inc | Water - NPDES Commercial Renewal | Steens | Lowndes |
| Columbus Light and Water Department, North Water Treatment Plant | Water - NPDES Minor Industrial Renewal | Columbus | Lowndes |
| Continental Tire the Americas, LLC | Water - Pretreatment Renewal | Clinton | Hinds |
| Cooper Marine and Timberlands Corporation | Water - NPDES Minor Industrial Renewal | Dennis | Tishomingo |
| Cooperative Energy, a Mississippi electric cooperative, Sylvarena Generating Plant | Water - NPDES Minor Industrial Renewal | Bay Springs | Smith |
| Corinth, City of, Corinth Class II Rubbish Site | Solid Waste - Rubbish Modification | Corinth | Alcorn |
| Cottonwing Air LLC | Water - State Operating Permit Renewal | Indianola | Sunflower |
| Craddock Oil Company, The C Store Number 301 | Water - NPDES Commercial Renewal | Summit | Pike |
| Crosby POTW | Water - NPDES Minor Municipal Renewal | Crosby | Wilkinson |
| Crossing LLC, The, North Ridge Crossing Subdivision | Water - NPDES Commercial Renewal | Saltillo | Lee |
| Crown Health Care Laundry LLC | Water - Pretreatment Renewal | Columbia | Marion |
| Crowson Thornton LLC, Crowson Auto World | Water - NPDES Commercial Renewal | Louisville | Winston |
| Crystal Springs POTW | Water - NPDES Minor Municipal Renewal | Crystal Springs | Copiah |
| Cushions To Go LLC | Air - SMOP Renewal | Pontotoc | Pontotoc |
| Cushions To Go LLC, Plant 3 | Air - SMOP Renewal | Baldwyn | Prentiss |
| Custom Commodities Transport | Water - Pretreatment | Bay St. Louis | Hancock |
| Custom Products Corporation | Water - Pretreatment ADMIN | Flowood | Rankin |
| Cutting Edge Meat Company, CEMCO Holdings LLC | Water - State Operating Permit Admin Mod | Leakesville | Greene |
| D Lo POTW | Water - NPDES Minor Municipal Renewal | D'Lo | Simpson |
| DAK Americas Mississippi Inc | Air - Title V Renewal | Bay St. Louis | Hancock |
| Danny J Dill, Rolling Acres Mobile Home Park | Water - State Operating Permit Renewal | Tupelo | Lee |
| Darling Ingredients Inc | Air - Title V Minor Modification | Jackson | Hinds |
| Davis Hartness Trailer Park | Water - State Operating Permit Renewal | Starkville | Oktibbeha |
| Dawn Williams dba Venus Park | Water - State Operating Permit Renewal | Brandon | Rankin |
| Dekalb POTW, Number 1 | Water - NPDES Minor Municipal Renewal | DeKalb | Kemper |
| Dekalb POTW, Number 2 | Water - NPDES Minor Municipal Renewal | DeKalb | Kemper |
| Delta Air Inc | Water - State Operating Permit Renewal | Belzoni | Humphreys |
| Delta MHP LLC | Water - NPDES Commercial Renewal | Sidon | Leflore |
| Denbury Onshore LLC, Little Creek EOR Facility | Air - Title V Renewal | Ruth | Pike |
| Desoto Outfitters LLP | Water - State Operating Permit Renewal | Brooklyn | Perry |
| Destin Pipeline Company LLC, Pascagoula Compressor Station | Air - Title V Renewal | Moss Point | Jackson |
| Destiny Mars LLC dba Outfitters | Water - NPDES Commercial Renewal | Hernando | Desoto |
| Diamondhead Water and Sewer District | Water - NPDES Major Municipal Renewal | Diamondhead | Hancock |
| Dickerson and Bowen Inc, McComb Asphalt Plant | Water - NPDES Minor Industrial Renewal | McComb | Pike |
| Dixie Dusters Inc | Water - State Operating Permit Renewal | Itta Bena | Leflore |
| ESCO Group LLC | Air - Title V Renewal | Newton | Newton |
| EXCA, LLC, Bluff Creek Mobile Home Park | Water - NPDES Commercial Renewal | Gautier | Jackson |
| East Jasper School District, The New William J Berry Elementary School | Water - NPDES Commercial Renewal | Heidelberg | Jasper |
| East Oxford Utilities LLC | Water - NPDES Commercial Admin Mod | Oxford | Lafayette |
| East Side Jersey Dairy Inc | Water - Pretreatment Renewal | Kosciusko | Attala |
| Edgewood Park Inc | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Edwards POTW | Water - NPDES Minor Municipal Renewal | Edwards | Hinds |
| Ellisville POTW, South | Water - NPDES Minor Municipal Renewal | Ellisville | Jones |
| Ellisville State School | Water - NPDES Minor Municipal Renewal | Ellisville | Jones |
| Entergy Mississippi LLC, Choctaw County Generating Station | Water - NPDES Major Industrial Renewal | French Camp | Choctaw |
| Entergy Mississippi LLC, Gerald Andrus Plant | Air - Title V Renewal | Greenville | Washington |
| Enviva Pellets Bond, LLC | Air - Construction Permit | Wiggins | Stone |
| Ergon Refining Inc | Water - NPDES Minor Industrial Modification | Vicksburg | Warren |
| Ethel POTW | Water - NPDES Minor Municipal Renewal | Ethel | Attala |
| FXI Inc, Baldwyn | Air - SMOP Modification | Baldwyn | Lee |
| Family Life Fellowship Inc | Water - State Operating Permit Renewal | Lucedale | George |
| Fayette POTW, North Lagoon | Water - NPDES Minor Municipal Renewal | Fayette | Jefferson |
| Fayette POTW, Northeast | Water - NPDES Minor Municipal Renewal | Fayette | Jefferson |
| Fayette POTW, Southwest | Water - NPDES Minor Municipal Renewal | Fayette | Jefferson |
| Fikes Wholesale Inc, CEFCO Number 584 | Water - NPDES Commercial Renewal | Stonewall | Clarke |
| First Chemical LLC dba Oleo-X | Water - Pretreatment Renewal | Pascagoula | Jackson |
| First Chemical LLC dba Oleo-X | Water - NPDES Storm | Pascagoula | Jackson |
| Five Star Products Inc | Air - Title V Renewal | Pontotoc | Pontotoc |
| Flea Market and RV Park at Menge LLC | Water - State Operating Permit Renewal | Pass Christian | Harrison |
| Florence Gardens Subdivision | Water Quality - 401 Certification | Gulfport | Harrison |
| Florida Gas Transmission Company, Carnes Compressor Station | Air - Title V Renewal | Carnes | Stone |
| Flying Y Aero Inc | Water - State Operating Permit Renewal | Tutwiler | Tallahatchie |
| Formentera Operations LLC, South Cypress Creek Facility | Air - Title V Admin Mod | Waynesboro | Wayne |
| Formentera Operations LLC, West Nancy Field | Air - Title V Admin Mod | Vossburg | Clarke |
| Foxworth POTW | Water - NPDES Minor Municipal Renewal | Foxworth | Marion |
| Front Porch Cafe LLC, The | Water - State Operating Permit Renewal | Pass Christian | Harrison |
| Fulton POTW, Southwest | Water - NPDES Minor Municipal Renewal | Fulton | Itawamba |
| Future Foam Inc | Air - SMOP Modification | Tupelo | Lee |
| G2O Technologies LLC | Water - State Operating Permit Admin Mod | Monticello | Lawrence |
| G2O Technologies LLC | Water - NPDES Minor Industrial Admin Mod | Centreville | Wilkinson |
| GCP Laboratories, Inc | Water - NPDES Minor Industrial Renewal | Gulfport | Harrison |
| GRT Ripley Operations LLC | Air - Title V Admin Mod | Ripley | Tippah |
| GRT Ripley Operations LLC | Water - NPDES Minor Industrial Renewal | Ripley | Tippah |
| GRT Ripley Operations LLC | Water - NPDES Minor Industrial Admin Mod | Ripley | Tippah |
| George County Schools, Benndale Elementary School | Water - State Operating Permit Renewal | Lucedale | George |
| Georgetown POTW | Water - NPDES Minor Municipal Renewal | Georgetown | Copiah |
| Georgia Pacific Wood Products LLC, Taylorsville | Air - Title V Modification | Taylorsville | Smith |
| Gloster Forest Products, LLC | Air - Air-Construction PSD | Gloster | Amite |
| Godfreys Trailer Park | Water - State Operating Permit Renewal | Forest | Scott |
| Goodman Road Car Wash LLC | Water - NPDES Commercial Renewal | Olive Branch | Desoto |
| Goodyear Tire and Rubber Company, The | Air - Title V Admin Mod | Tupelo | Lee |
| Goodyear Tire and Rubber Company, The | Air - Title V Renewal | Tupelo | Lee |
| Grand Oaks Lake Project | Water Quality - 401 Certification | Oxford | Lafayette |
| Great River Utility Operating Company LLC, Beersheba Hills Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Great River Utility Operating Company LLC, Big Bay Lake Subdivision | Water - State Operating Permit Renewal | Lumberton | Lamar |
| Great River Utility Operating Company LLC, Centerhill Downs Subdivision | Water - NPDES Commercial Renewal | Olive Branch | Desoto |
| Great River Utility Operating Company LLC, Edgewood Subdivision | Water - NPDES Commercial Renewal | Oxford | Lafayette |
| Great River Utility Operating Company LLC, Forest Cove Subdivision | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Great River Utility Operating Company LLC, High Forest Subdivision | Water - NPDES Commercial Renewal | Tupelo | Lee |
| Great River Utility Operating Company LLC, Highlands Subdivision, The | Water - NPDES Commercial Renewal | Senatobia | Tate |
| Great River Utility Operating Company LLC, Villanova Subdivision | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Great River Utility Operating Company, LLC, Blakely Sewage District Subdivision | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Great River Utility Operating Company, LLC, Dogwood Lake Estates | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Great River Utility Operating Company, LLC, Highway 589 Lagoon and Spray Field | Water - State Operating Permit Renewal | Hattiesburg | Lamar |
| Great River Utility Operating Company, LLC, Lower Woodville Estates | Water - NPDES Commercial Admin Mod | Natchez | Adams |
| Great River Utility Operating Company, LLC, Mobile Home Park | Water - NPDES Commercial Renewal | Starkville | Oktibbeha |
| Great River Utility Operating Company, LLC, Oak Park Subdivision | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Great River Utility Operating Company, LLC, Pleasant Valley Utility Subdivision | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Great River Utility Operating Company, LLC, Serene Hills Subdivision | Water - NPDES Commercial Admin Mod | Hattiesburg | Forrest |
| Great River Utility Operating Company, LLC, Timber Creek Apartments | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Great Southern Industries Inc | Water - Pretreatment | Jackson | Hinds |
| Green Acres Water Association Inc, Lane Acres Subdivision | Water - NPDES Commercial Renewal | Lyon | Coahoma |
| Greene County Board of Supervisors, Green Rural Events Center | Water - State Operating Permit Renewal | Leakesville | Greene |
| Greenville POTW | Water - NPDES Major Municipal Renewal | Greenville | Washington |
| Grenada POTW, Holcomb Facility | Water - NPDES Minor Municipal Renewal | Holcomb | Grenada |
| Grundfest and Klaus Gin Inc | Air - State Operating Permit Renewal | Cary | Sharkey |
| Gulf LNG Energy LLC, LNG Clean Energy Project | Water Quality - 401 Certification | Pascagoula | Jackson |
| Gulf South Pipeline Company LLC, Heidelberg Compressor Station | Air - SMOP Renewal | Heidelberg | Jasper |
| Gulf South Pipeline Company LLC, McComb Compressor Station | Air - Title V Renewal | Jayess | Walthall |
| Gunnison POTW | Water - NPDES Minor Municipal Renewal | Gunnison | Bolivar |
| Hancock County Technical Center | Water Quality - 401 Certification | Kiln | Hancock |
| Hancock County Utility Authority, Southern Regional WWTP | Water - NPDES Major Municipal Renewal | Waveland | Hancock |
| Hancock County Utility Authority, Western Regional WWTP | Water - NPDES Minor Municipal | Pearlington | Hancock |
| Hankins Lumber Company Inc, Elliott | Air - Title V Renewal | Elliott | Grenada |
| Harrison County Development Commission, Bayou Bernard Industrial District | Water Quality - 401 Certification | Gulfport | Harrison |
| Hattiesburg Laurel Regional Airport Authority | Water - NPDES Commercial Renewal | Moselle | Jones |
| Haworth Inc., Bruce Plant | Water - Pretreatment Renewal | Bruce | Calhoun |
| Haygood Trailer Park | Water - NPDES Commercial Renewal | McComb | Pike |
| Heritage Investment Properties LLC, Reservoir Trail Townhouses | Water - State Operating Permit Renewal | Bailey | Lauderdale |
| Hickory POTW | Water - NPDES Minor Municipal Renewal | Hickory | Newton |
| Hills of the Bear LLC, Hills of the Bear LLC South Facility | Water - State Operating Permit Renewal | Iuka | Tishomingo |
| Holmes County School District, Goodman Pickens Elementary School | Water - NPDES Commercial Renewal | Goodman | Holmes |
| Holmes County School District, S V Marshall Elementary School | Water - NPDES Commercial Renewal | Lexington | Holmes |
| Hood Industries Inc | Air - Air-Construction PSD | Silver Creek | Lawrence |
| Houston POTW | Water - NPDES Minor Municipal Renewal | Houston | Chickasaw |
| Hunt Southland Refining Company | Air - Title V Renewal | Vicksburg | Warren |
| Hunt Southland Refining Company LLC | Air - Title V Renewal | Lumberton | Lamar |
| Huntington Ingalls Incorporated, Ingalls Shipbuilding Division, Pascagoula Operations | Water Quality - 401 Certification | Pascagoula | Jackson |
| Hutson Ventures LLC | Water - NPDES Commercial Renewal | Brookhaven | Lincoln |
| Industrial Chemical Solutions LLC | Water - Pretreatment Renewal | Columbia | Marion |
| Institute For Marine Mammal Studies Inc, The, Research and Rehabilitation Facility | Water - NPDES Minor Industrial Renewal | Gulfport | Harrison |
| Interfor US Inc, Bay Springs Division | Water - NPDES Minor Industrial Renewal | Bay Springs | Jasper |
| Interfor US Inc, Bay Springs Division | Air - Air-Construction PSD | Bay Springs | Jasper |
| International Paper Company, Columbus Modified Fiber Plant | Water - Pretreatment Modification | Columbus | Lowndes |
| International Paper Company, Houston | Air - SMOP Modification | Houston | Chickasaw |
| International Paper Company, Richland Facility | Air - SMOP Modification | Richland | Rankin |
| Itawamba County Schools, Dorsey Elementary School | Water - NPDES Commercial Renewal | Fulton | Itawamba |
| Itta Bena POTW | Water - NPDES Minor Municipal Renewal | Itta Bena | Leflore |
| J Ds Flying Service Inc | Water - State Operating Permit Renewal | Glen Allan | Washington |
| J and G Enterprises LLC, Price Trailer Park | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| JAI Jalaram Inc, Super 8 Motel | Water - NPDES Commercial Renewal | Tupelo | Lee |
| JBW Construction, LLC | Water Quality - 401 Certification | Bay St. Louis | Hancock |
| JELG Properties LLC, Hillsdale Apartments | Water - NPDES Commercial Renewal | Tremont | Itawamba |
| JS LLC, Garden Park Estates | Water - NPDES Commercial Renewal | Saltillo | Lee |
| JS LLC, Mount Vernon Estates Subdivision | Water - NPDES Commercial Renewal | Tupelo | Lee |
| Jack Batte and Sons Inc | Air - Title V Minor Modification | Forest | Smith |
| Jackson County Board of Supervisors, Dredging, Lake Comynie | Water Quality - 401 Certification | Pascagoula | Jackson |
| Jackson County Board of Supervisors, East Central Community Center | Water - State Operating Permit Renewal | Hurley | Jackson |
| Jackson County Board of Supervisors, Lake Yazoo Canal Maintenance Dredging | Water Quality - 401 Certification | Pascagoula | Jackson |
| Jimmy Peterson, Peterson Subdivision | Water - State Operating Permit Renewal | Sturgis | Winston |
| Joe Reed and Company Inc, Class I Rubbish Site | Solid Waste - Rubbish Modification | Cleveland | Bolivar |
| Joel Trusts Partnership | Water - NPDES Commercial Renewal | Cleveland | Bolivar |
| John Pace, Arrington Place Apartments | Water - State Operating Permit Renewal | Hattiesburg | Forrest |
| John Reeves, RMW Commercial Park | Water - State Operating Permit Renewal | Meridian | Lauderdale |
| John Shepherd, Rocky Creek Catfish Cottage | Water - State Operating Permit Renewal | Lucedale | George |
| KA3M Management LLC, The Chimney at Poorhouse | Water - NPDES Commercial | Starkville | Oktibbeha |
| Katrina Forbes dba Rabbitman Farms | Water - State Operating Permit Renewal | Sandy Hook | Marion |
| Keiths Superstore Number 115 LLC | Water - State Operating Permit Renewal | Moselle | Jones |
| Kelley Brothers Contractors Inc | Water - State Operating Permit Renewal | Waynesboro | Wayne |
| Kim Tuggle, Country Side RV Park | Water - State Operating Permit Renewal | Saucier | Harrison |
| Kimberly Clark Corporation, Corinth Mill | Air - Title V Renewal | Corinth | Alcorn |
| Koch Farms of Mississippi LLC | Air - SMOP Renewal | Morton | Scott |
| Kohler Company, Hattiesburg Engine Plant Number 2 | Air - Title V Modification | Hattiesburg | Forrest |
| Kosciusko POTW, South | Water - NPDES Major Municipal Renewal | Kosciusko | Attala |
| Kuts and Kurls 3 LLC | Water - NPDES Commercial Renewal | Weir | Choctaw |
| L and L Flying Inc | Water - State Operating Permit Renewal | Glen Allan | Issaquena |
| La Z Boy Inc, Plant 21 | Air - SMOP Renewal | Newton | Newton |
| Lakeview Holdings LLC, Lakeview Mobile Home Park | Water - State Operating Permit Renewal | Walls | Desoto |
| Land Sales LLC dba Lakeview RV Resort | Water - State Operating Permit Renewal | Saucier | Harrison |
| Lauderdale County School District, Northeast Middle School | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Lauderdale County School District, West Lauderdale Attendance Center | Water - NPDES Commercial Renewal | Collinsville | Lauderdale |
| Leaf River Cellulose LLC | Water - State Operating Permit Renewal | New Augusta | Perry |
| Leakesville POTW | Water - NPDES Minor Municipal Renewal | Leakesville | Greene |
| Legacy Boats LLC dba Avid Boats | Air - SMOP Modification | Amory | Monroe |
| Lily Rose Water Association Inc, Stamps Subdivision | Water - NPDES Commercial Renewal | Prentiss | Jefferson Davis |
| Lincoln County School District, Loyd Star School | Water - NPDES Commercial Renewal | Brookhaven | Lincoln |
| Lincoln County Schools, Bogue Chitto Attendance Center | Water - NPDES Commercial Renewal | Bogue Chitto | Lincoln |
| Lincoln County Schools, Enterprise Attendance Center | Water - NPDES Commercial Renewal | Brookhaven | Lincoln |
| Little Angels Day Care Center, Inc | Water - State Operating Permit Renewal | Perkinston | Stone |
| Long Beach Industrial District Park | Water - NPDES Minor Industrial Renewal | Long Beach | Harrison |
| Longwood Flying Service Inc | Water - State Operating Permit Renewal | Hollandale | Washington |
| Louis Dreyfus Company River Elevators LLC, Port of Rosedale, River Elevator | Air - SMOP Modification | Rosedale | Bolivar |
| Louisville Municipal School District, Nanih Waiya Attendance Center | Water - NPDES Commercial Renewal | Louisville | Winston |
| Louisville POTW, East | Water - NPDES Minor Municipal Renewal | Louisville | Winston |
| Louisville POTW, South | Water - NPDES Minor Municipal Renewal | Louisville | Winston |
| M J Feed Mill MS LLC | Air - SMOP Renewal | Waynesboro | Wayne |
| M and M Milling at Brookhaven Inc dba M and M Milling Company | Air - SMOP Renewal | Brookhaven | Lincoln |
| M and M Processing LLC | Water - NPDES Minor Industrial Renewal | Biloxi | Harrison |
| MC Environmental LLC, MC Environmental Class I Rubbish Facility | Solid Waste - Composting | Columbia | Marion |
| MDOT, 5th District Complex | Water - NPDES Commercial Renewal | Newton | Newton |
| MDOT, Interstate 55 North, Rest Area, Holmes | Water - NPDES Commercial Renewal | West | Holmes |
| MDOT, Interstate 55 South, Rest Area, Carroll | Water - NPDES Commercial Renewal | Vaiden | Carroll |
| MEC Inc dba The Pony | Water - NPDES Commercial Renewal | Starkville | Lowndes |
| MGC Terminal LLC | Air - SMOP Modification | Meridian | Lauderdale |
| MSARNG, Camp McCain Training Center | Water - NPDES Commercial Renewal | Elliott | Grenada |
| Maben POTW | Water - NPDES Minor Municipal Renewal | Maben | Webster |
| MacroSource, LLC - Vicksburg | Air - SMOP Renewal | Vicksburg | Warren |
| Magee POTW | Water - NPDES Minor Municipal Renewal | Magee | Simpson |
| Magnolia POTW, North | Water - NPDES Minor Municipal Renewal | Magnolia | Pike |
| Magnolia POTW, South | Water - NPDES Minor Municipal Renewal | Magnolia | Pike |
| Maintenance Systems Inc, MSI Albritton North Site | Solid Waste - Land Application | Braxton | Simpson |
| Maintenance Systems Inc, MSI Albritton South Site | Solid Waste - Land Application | Braxton | Simpson |
| Maintenance Systems Inc, MSI McAlpin Site | Solid Waste - Land Application | Magee | Simpson |
| Marcal Natchez LLC | Water - NPDES Major Industrial Renewal | Natchez | Adams |
| MarcoSource,LLC Greenville South | Air - Construction Permit | Greenville | Washington |
| MarcoSource,LLC Greenville South | Air - SMOP | Greenville | Washington |
| Masonite Corporation | Air - Title V Minor Modification | Laurel | Jones |
| Mathiston POTW | Water - NPDES Minor Municipal Renewal | Mathiston | Choctaw |
| Mellomeade | Water Quality - 401 Certification | Brandon | Rankin |
| Metaline Products Inc | Water - Pretreatment Renewal | Crystal Springs | Copiah |
| Mid South Lumber Inc | Water - State Operating Permit Renewal | Meridian | Lauderdale |
| Midcontinent Express Pipeline LLC, MEP 4 Vicksburg Compressor Station | Air - Title V Renewal | Edwards | Hinds |
| Mike Vance dba Vance Mobile Home Park | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Miles Homes Inc, Miles Homes Subdivision | Water - NPDES Commercial Renewal | Minter City | Leflore |
| Miss Tracy's ABC and Me LLC | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Mississippi Action for Progress Inc, Eupora Head Start Center | Water - NPDES Commercial Renewal | Eupora | Webster |
| Mississippi Baptist Convention Board, Central Hills Baptist Retreat | Water - NPDES Commercial Renewal | West | Attala |
| Mississippi Baptist Medical Center | Air - Title V Renewal | Jackson | Hinds |
| Mississippi Depaartment of Transportation, MDOT Jackson 103060 301000 | Water Quality - 401 Certification | Ocean Springs | Jackson |
| Mississippi Department of Marine Resources, Pelican Key Beneficial Use Site | Water Quality - 401 Certification | Biloxi | Harrison |
| Mississippi Department of Wildlife Fisheries and Parks, Clarkco State Park | Water - NPDES Commercial Renewal | Quitman | Clarke |
| Mississippi Department of Wildlife Fisheries and Parks, George Payne Cossar State Park | Water - NPDES Commercial Renewal | Oakland | Yalobusha |
| Mississippi Department of Wildlife Fisheries and Parks, Holmes County State Park | Water - NPDES Commercial Renewal | Durant | Holmes |
| Mississippi Department of Wildlife Fisheries and Parks, Hugh White State Park | Water - NPDES Commercial Renewal | Grenada | Grenada |
| Mississippi Department of Wildlife Fisheries and Parks, Hugh White State Park, Carver Point | Water - NPDES Commercial Renewal | Grenada | Grenada |
| Mississippi Department of Wildlife Fisheries and Parks, John Kyle State Park | Water - NPDES Commercial Renewal | Sardis | Panola |
| Mississippi Department of Wildlife Fisheries and Parks, Natchez State Park | Water - State Operating Permit Renewal | Natchez | Adams |
| Mississippi Department of Wildlife Fisheries and Parks, Tombigbee State Park | Water - NPDES Commercial Renewal | Tupelo | Lee |
| Mississippi Lignite Mining Company | Water - NPDES Minor Industrial Modification | Ackerman | Choctaw |
| Mississippi Marine Corporation, Main, Central, and South Yards | Water - Pretreatment Renewal | Greenville | Washington |
| Mississippi Polymers Inc | Air - Title V Renewal | Corinth | Alcorn |
| Mississippi Power Company, Bayou Casotte- International Paper Access Road | Water Quality - 401 Certification | Pascagoula | Jackson |
| Mississippi Power Company, Chevron Cogenerating Plant | Air - Title V Modification | Pascagoula | Jackson |
| Mississippi Power Company, Plant Jack Watson | Air - Title V Renewal | Gulfport | Harrison |
| Mississippi Power Company, Plant Victor J Daniel | Water - NPDES Minor Industrial Renewal | Moss Point | Jackson |
| Mississippi Silicon LLC, Burnsville Silicon Manufacturing Plant | Air - Construction PSD modification | Burnsville | Tishomingo |
| Mississippi Wildlife Fisheries and Parks, Lake Lowndes State Park | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Modine Grenada LLC, CCP Facility | Water - Pretreatment Renewal | Grenada | Grenada |
| Monticello POTW | Water - NPDES Minor Municipal Renewal | Monticello | Lawrence |
| Moorhead POTW | Water - NPDES Minor Municipal Renewal | Moorhead | Sunflower |
| Morgan City Water and Sewer Association Inc | Water - NPDES Minor Municipal Renewal | Morgan City | Leflore |
| Mound Bayou POTW | Water - NPDES Minor Municipal Renewal | Mound Bayou | Bolivar |
| Mr Jiffy Inc | Water - NPDES Commercial Renewal | Batesville | Panola |
| Mueller Copper Tube Company LLC | Water - Pretreatment ADMIN | Fulton | Itawamba |
| Mueller Copper Tube Company LLC | Air - Title V Admin Mod | Fulton | Itawamba |
| NASA Shared Service Center, NCCIPS | Air - Title V Renewal | Stennis Space Center | Hancock |
| NSLC Southern Inc | Water - NPDES Minor Industrial Renewal | Hermanville | Claiborne |
| Natchez POTW | Water - NPDES Major Municipal Renewal | Natchez | Adams |
| National Aeronautics and Space Administration, John C Stennis Space Center | Water - NPDES Minor Industrial Renewal | Stennis Space Center | Hancock |
| Nautic Star LLC | Air - Title V Renewal | Amory | Monroe |
| Nautic Star LLC | Air - Title V Admin Mod | Amory | Monroe |
| Nicholson Water and Sewer Association Inc | Water - NPDES Commercial Renewal | Nicholson | Pearl River |
| North East Mississippi Electric Power Association | Water - NPDES Commercial Renewal | Oxford | Lafayette |
| North Hinds Water Association | Water - NPDES Commercial | Bolton | Hinds |
| Northeast Mississippi Solid Waste Management Authority, Northeast Mississippi Regional Landfill | Solid Waste - Mun Landfill Modification | Walnut | Tippah |
| Northeast Mississippi Solid Waste Management Authority, Northeast Mississippi Regional Landfill | Water Quality - 401 Certification | Walnut | Tippah |
| Northeast Mississippi Solid Waste Management Authority, Northeast Mississippi Regional Landfill | Water - NPDES Storm Modification | Walnut | Tippah |
| Northeast Mississippi Solid Waste Management Authority, Northeast Mississippi Regional Landfill | Air - Title V Renewal | Walnut | Tippah |
| Noxapater POTW, North | Water - NPDES Minor Municipal Renewal | Noxapater | Winston |
| Noxapater POTW, South | Water - NPDES Minor Municipal Renewal | Noxapater | Winston |
| Noxapater, Town of, Flower Ridge Water Treatment Plant | Water - State Operating Permit Renewal | Noxapater | Winston |
| Oakland POTW | Water - State Operating Permit Renewal | Oakland | Yalobusha |
| Oil Dri Production Company | Water - Pretreatment Renewal | Ripley | Tippah |
| Oil Dri Production Company | Water - NPDES Minor Industrial Renewal | Ripley | Tippah |
| Oxbow Greenwood, LLC | Water - Pretreatment Renewal | Greenwood | Leflore |
| Oxford School District, OSD Bus Shop and Maintenance Facility | Water - State Operating Permit Renewal | Oxford | Lafayette |
| PDC Utilities LLC, Grand Harbor Condominiums | Water - NPDES Commercial Renewal | Iuka | Tishomingo |
| PPM Consultants Inc, Grannys Corner | Water - NPDES Minor Industrial | McCall Creek | Franklin |
| PROFILE Products LLC | Water - State Operating Permit Renewal | Blue Mountain | Tippah |
| Palmer Home For Children, Mississippi Sheriffs Boys and Girls Ranch | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Palmer Home for Children, Palmer Home Waste Water Lagoon | Water - State Operating Permit Renewal | Lake Cormorant | Desoto |
| Paloma Natural Gas LLC, C H Lewis 30-19H Number 1 Production Facility | Air - SMOP Admin Mod | Liberty | Amite |
| Pascagoula Water Treatment Plant, Bayou Casotte | Water - NPDES Minor Industrial Renewal | Pascagoula | Jackson |
| Pascagoula Water Treatment Plant, Communy Avenue | Water - NPDES Minor Industrial Renewal | Pascagoula | Jackson |
| Pat Harrison Waterway District, Big Creek Watershed Site Number 10 | Water - NPDES Commercial Renewal | Soso | Jones |
| Pat Harrison Waterway District, Dunn's Falls Water Park | Water - State Operating Permit Renewal | Enterprise | Lauderdale |
| Pat Harrison Waterway District, Little Black Creek Water Park | Water - NPDES Commercial Renewal | Lumberton | Lamar |
| Pat Harrison Waterway District, Maynor Creek Water Park | Water - NPDES Commercial Renewal | Waynesboro | Wayne |
| Pat Harrison Waterway District, Turkey Creek Water Park | Water - NPDES Commercial Renewal | Decatur | Newton |
| Peaceful Prosperity Housing, LLC | Water - State Operating Permit Renewal | Hattiesburg | Forrest |
| Pearl River County Board of Supervisors, Pearl River County Health Department | Water - State Operating Permit Renewal | Carriere | Pearl River |
| Pearl River County Board of Supervisors, Walkiah Bluff Water Park | Water - State Operating Permit Renewal | Picayune | Pearl River |
| Pearl River County School District, Pearl River Central High School | Water - NPDES Commercial Renewal | Carriere | Pearl River |
| Pearl River County Utility Authority, Poplarville POTW | Water - NPDES Major Municipal Renewal | Poplarville | Pearl River |
| Pearson Investors Properties II LLC | Water - NPDES Minor Industrial, NPDES Commercial Renewal | Brandon | Rankin |
| Peco Farms of Mississippi LLC, Feed Mill | Water - NPDES Minor Industrial Renewal | Bay Springs | Jasper |
| Perry County Board of Supervisors, Perry County Industrial Site | Water Quality - 401 Certification | New Augusta | Perry |
| Phelps Trailer Park LLC | Water - State Operating Permit Renewal | Brandon | Rankin |
| Philadelphia POTW | Water - NPDES Major Municipal Renewal | Philadelphia | Neshoba |
| Phillip Water and Sewer Association | Water - NPDES Commercial Renewal | Philipp | Tallahatchie |
| Pickens POTW | Water - NPDES Minor Municipal Renewal | Pickens | Holmes |
| Pine Lake Mobile Home Estates LLC | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Pitcock Meat Processing Inc | Water - State Operating Permit Modification | Pope | Panola |
| Pontotoc County Industrial Park WWTP | Water - NPDES Minor Industrial Renewal | Pontotoc | Pontotoc |
| Powe Timber Company, dba American Wood | Water - Pretreatment Renewal | Richton | Perry |
| Prairie Land Water Association Inc, Prairie Waters Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Prairie Land Water Association Inc, Elm Lake Ranch Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Precoat Mezzanine LLC, dba Precoat Metals | Water - Pretreatment Renewal | Jackson | Hinds |
| Precoat Mezzanine LLC, dba Precoat Metals | Water - Pretreatment ADMIN | Jackson | Hinds |
| Precoat Mezzanine LLC, dba Precoat Metals | Air - Title V Admin Mod | Jackson | Hinds |
| Pregis LLC | Air - Title V Renewal | Tupelo | Lee |
| Prentiss POTW | Water - NPDES Minor Municipal Renewal | Prentiss | Jefferson Davis |
| ProVia Products LLC, dba Heartland Siding | Water - Pretreatment Renewal | Booneville | Prentiss |
| Pruet Production Company, Fleming et al 30-15 Number 1 | Air - Construction Permit Modification | Quitman | Clarke |
| Pruet Production Company, McLeod 30-11 Number 1 Production Facility | Air - Construction Permit Modification | Quitman | Clarke |
| Puckett POTW | Water - NPDES Minor Municipal Renewal | Puckett | Rankin |
| Purvis POTW | Water - NPDES Minor Municipal Renewal | Purvis | Lamar |
| Quad County Environmental Solutions LLC, Quad County Landfill | Air - Title V Admin Mod | Byhalia | Marshall |
| Quad County Environmental Solutions LLC, Quad County Landfill | Water - NPDES Storm Admin Mod | Byhalia | Marshall |
| Quitman Pellets LLC | Air - Construction Permit Modification | Quitman | Clarke |
| RANDS, LLC, Lewis Farms | Water Quality - 401 Certification | Gluckstadt | Madison |
| Railroad Avenue Disposal LLC | Solid Waste - Rubbish Modification | Olive Branch | Desoto |
| Rain CII Carbon LLC | Air - Title V Minor Modification | Purvis | Lamar |
| Rainey Tiger Splash LLC | Water - NPDES Commercial Renewal | Nettleton | Monroe |
| Rawls Springs Utility District, Lakewood Estates Subdivision | Water - NPDES Commercial Renewal | Maybank | Forrest |
| Rayburn Enterprizes Inc, Pine Ridge Villa | Water - State Operating Permit Renewal | Tylertown | Walthall |
| Region 1 Mental Health Center, Fairland Center | Water - NPDES Commercial Renewal | Tutwiler | Coahoma |
| Region I Mental Health Center, Sunflower Landing | Water - NPDES Commercial Renewal | Dublin | Coahoma |
| Relativity Space Inc | Water - NPDES Minor Industrial | Stennis Space Center | Hancock |
| Renees Tumble and Cheer LLC | Water - State Operating Permit Renewal | Kossuth | Alcorn |
| Renewable Wood Solutions LLC | Air - Construction Permit | Crystal Springs | Copiah |
| Renewable Wood Solutions LLC | Air - Title V | Crystal Springs | Copiah |
| Resolute FP US Inc, Grenada Operations | Air - Title V Renewal | Grenada | Grenada |
| Richton POTW | Water - NPDES Minor Municipal Renewal | Richton | Perry |
| Ripley Cremation Services LLC | Air - Construction Permit Modification | Ripley | Tippah |
| River Ridge Forest Products LLC | Air - Construction Permit | Bude | Franklin |
| Robinwood Forest Utilities Association Inc, Robinwood Development | Water - NPDES Commercial Renewal | Gulfport | Harrison |
| Robinwood Forest Utility Association Inc, Hidden Point Subdivision | Water - NPDES Commercial Renewal | Saucier | Harrison |
| Rocking R Dairy Inc | Water - State Operating Permit Renewal | Tylertown | Walthall |
| Roger Parker, Cove Lane Cottages | Water - NPDES Commercial Renewal | Tupelo | Lee |
| Rohm and Haas Chemicals LLC | Water - NPDES Storm Renewal | Moss Point | Jackson |
| Rohm and Haas Chemicals LLC | Hazardous Waste - TSD Post-Closure Renewal | Moss Point | Jackson |
| Rohm and Haas Chemicals LLC | Water - Pretreatment Renewal | Moss Point | Jackson |
| Rolls Royce North America Inc, Rolls Royce Outdoor Test Facility | Air - Title V Renewal | Stennis Space Center | Hancock |
| Roxul USA Inc | Air - Air-Construction PSD Admin Mod | Byhalia | Marshall |
| SABIC Innovative Plastics US LLC | Air - Title V Minor Modification | Bay St. Louis | Hancock |
| SABIC Innovative Plastics US LLC | Water - Pretreatment Renewal | Bay St. Louis | Hancock |
| SG Resources Mississippi LLC, Southern Pines Energy Center | Air - Title V Renewal | Leakesville | Greene |
| Salem House Banquet and Reception Hall | Water - NPDES Commercial Renewal | Picayune | Pearl River |
| Sanderson Farms LLC McComb Processing | Water - NPDES Minor Industrial Admin Mod | Summit | Pike |
| Sanderson Farms LLC, Collins Processing | Air - SMOP Admin Mod | Collins | Covington |
| Sanderson Farms LLC, Collins Processing | Water - NPDES Minor Industrial Admin Mod | Collins | Covington |
| Sanderson Farms LLC, Foods Division | Water - Pretreatment ADMIN | Flowood | Rankin |
| Sanderson Farms LLC, Foods Division | Water - NPDES Minor Industrial Admin Mod | Flowood | Rankin |
| Sanderson Farms LLC, Hazlehurst Processing | Water - NPDES Minor Industrial Admin Mod | Hazlehurst | Copiah |
| Sanderson Farms LLC, Laurel Processing | Water - Pretreatment ADMIN | Laurel | Jones |
| Sanderson Farms LLC, Laurel Processing | Air - SMOP Admin Mod | Laurel | Jones |
| Sandman Bedding LLC | Air - Construction Permit | Belden | Lee |
| Sardis, Town of, Sardis Lake Development | Water - State Operating Permit Renewal | Sardis Lake | Panola |
| Scott County Schools, Scott Central Attendance Center | Water - NPDES Commercial Renewal | Forest | Scott |
| Senatobia POTW | Water - NPDES Major Municipal Renewal | Senatobia | Tate |
| Shady Grove Utility District, Hoy and Green Acres Subdivision | Water - NPDES Commercial Renewal | Laurel | Jones |
| Shannon Agricultural Flying Inc | Water - State Operating Permit Renewal | Clarksdale | Coahoma |
| Shannon POTW, East | Water - NPDES Minor Municipal Renewal | Shannon | Lee |
| Shannon POTW, West | Water - NPDES Minor Municipal Renewal | Shannon | Lee |
| Shelby Air Service Inc | Water - State Operating Permit Renewal | Shelby | Bolivar |
| Sienna Utilities LLC, Sienna Fields Subdivision | Water - State Operating Permit Renewal | Sumrall | Lamar |
| Silver Creek POTW | Water - NPDES Minor Municipal Renewal | Silver Creek | Lawrence |
| Silver Slipper Resort and Casino | Water Quality - 401 Certification | Bay St. Louis | Hancock |
| Simpson County School District, Simpson Central School | Water - NPDES Commercial Renewal | Pinola | Simpson |
| Sims Bark Company Inc | Water - NPDES Minor Industrial Renewal | Olive Branch | Desoto |
| Smithville POTW | Water - NPDES Minor Municipal Renewal | Smithville | Monroe |
| Snow Brake Air Service Inc | Water - State Operating Permit Renewal | Webb | Tallahatchie |
| Sodoma Properties LLC, Russell Mobile Home Park | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| South Creek Homes LLC, Chapel Woods Phase I and II | Water Quality - 401 Certification | Hernando | Desoto |
| South Gate Sewer District | Water - NPDES Minor Municipal Renewal | Columbus | Lowndes |
| Southern Christian Services for Children and Youth Inc, Joe Rowland Therapeutic Group Home for Boys | Water - NPDES Commercial Renewal | Grenada | Grenada |
| Southern Energy Operating LLC, Burnside Facility | Air - SMOP Renewal | Satartia | Yazoo |
| Southern Estates, LLC, Mobile Home Park | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Southern Natural Gas Company LLC, Bay Springs Compressor Station | Air - Title V Renewal | Bay Springs | Jasper |
| Southern Natural Gas Company LLC, Onward Compressor Station | Air - Title V Renewal | Cary | Sharkey |
| Southern Tire Recycling LLC | Solid Waste - Waste Tire Processor | Richland | Rankin |
| Southland Flying Service Inc | Water - State Operating Permit Renewal | Tchula | Holmes |
| Southwest Mississippi Community College POTW | Water - NPDES Minor Municipal Renewal | Summit | Pike |
| Southwire Company LLC | Air - SMOP Modification | Starkville | Oktibbeha |
| Southwood District | Water Quality - 401 Certification | Gulfport | Harrison |
| Springfield Services LLC | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Springwood LLC, Property Site Clearing and Timber Harvest | Water Quality - 401 Certification | Flora | Madison |
| Steel Dynamics Columbus LLC | Air - Title V Renewal | Columbus | Lowndes |
| Stella Jones Corporation Durant | Air - Title V | Durant | Holmes |
| Stella Jones Corporation Durant | Air - Construction Permit | Durant | Holmes |
| Stennis International Airport | Water Quality - 401 Certification | Bay St. Louis | Hancock |
| Steve Mulkey dba Meridian East, Toomsbuba KOA | Water - NPDES Commercial Renewal | Toomsuba | Lauderdale |
| Structural Steel Services Inc, Plants 1, 2, and 6 | Air - Title V Renewal | Meridian | Lauderdale |
| Sturdivant Brothers Flying Service Inc | Water - State Operating Permit Renewal | Minter City | Leflore |
| Sunflower POTW | Water - NPDES Minor Municipal Renewal | Sunflower | Sunflower |
| TA Operating LLC, Meridian Travel Center | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Tate County School District, East Tate Elementary School | Water - NPDES Commercial Renewal | Coldwater | Tate |
| Tate County School District, Independence High School | Water - NPDES Commercial Renewal | Independence | Tate |
| Tennessee Gas Pipeline Company LLC, Columbus Compressor Station Number 546 | Air - Title V Renewal | Columbus | Lowndes |
| Tennessee Gas Pipeline Company LLC, Heidelberg Compressor Station Number 538 | Air - Title V Renewal | Heidelberg | Jasper |
| Tennessee Gas Pipeline Company LLC, Purvis Compressor Station Number 534 | Air - Title V Renewal | Purvis | Forrest |
| Terri Smith dba Piave Grocery and Farm Supply | Water - NPDES Commercial Renewal | Richton | Greene |
| Texas Eastern Transmission LP, Kosciusko Compressor Station Number 202 | Air - Title V Renewal | Kosciusko | Attala |
| Texas Gas Transmission LLC, Clarksdale Compressor Station | Water - State Operating Permit Renewal | Clarksdale | Coahoma |
| Texas Gas Transmission LLC, Greenville Compressor Station | Water - NPDES Minor Industrial Renewal | Greenville | Washington |
| Texas Gas Transmission LLC, Lake Cormorant Compressor Station | Air - Title V Renewal | Lake Cormorant | Desoto |
| The New York Blower Company | Air - Construction Permit | Philadelphia | Neshoba |
| Thomas Properties of MS LLC, Cedar Meadows Mobile Home Community | Water - NPDES Commercial Renewal | Pontotoc | Pontotoc |
| Tishomingo Acquisition LLC, dba TBEI, Tishomingo | Water - Pretreatment Renewal | Tishomingo | Tishomingo |
| Tishomingo County Water District Water Treatment Plant | Water - NPDES | Iuka | Tishomingo |
| Toyota Boshoku Mississippi LLC | Air - SMOP Renewal | Mantachie | Itawamba |
| Tracy Chaney dba Stick Wagon Cafe | Water - State Operating Permit Renewal | Union | Neshoba |
| Traditions Prepared Meals, LLC | Water - Pretreatment Renewal | Pearl | Rankin |
| TransAmerican Waste Central Landfill Inc, Central Landfill Facility | Water - Pretreatment Renewal | McNeill | Pearl River |
| Transcontinental Gas Pipe Line Company LLC, Compressor Station 80 | Air - Title V Renewal | Heidelberg | Jones |
| Transcontinental Gas Pipeline Company LLC, Station 70 | Air - Title V Minor Modification | Tylertown | Walthall |
| Trash Hunters Inc, City of Durant Sanitary Landfill | Water - Pretreatment Renewal | Durant | Holmes |
| Trulite Glass and Aluminum Solutions LLC | Water - Pretreatment Renewal | Grenada | Grenada |
| Tunica County Tourism Commission dba Tunica Convention and Visitors Bureau | Water - State Operating Permit Renewal | Tunica Resort | Tunica |
| Tunica POTW | Water - NPDES Minor Municipal Renewal | Tunica | Tunica |
| Tupelo Airport Authority | Water - State Operating Permit Renewal | Tupelo | Lee |
| U S Army COE, Vicksburg District, General Permit 53, NASA | Water Quality - 401 Certification | Stennis Space Center | Hancock |
| US Army COE, Aberdeen Lock and Dam, East | Water - State Operating Permit Renewal | Aberdeen | Monroe |
| US Army COE, Bayou Point, Arkabutla Lake | Water - NPDES Commercial, NPDES Federal Minor Renewal | Coldwater | Tate |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army COE, Mobile District, General Permits 1 17 | Water Quality - 401 Certification | Biloxi | Harrison |
| US Army Corps of Engineers Memphis District, Sherard Seepage Remediation Installation of Seepage Ber | Water Quality - 401 Certification | Sherard | Coahoma |
| USDA Forest Service, Clear Springs Recreation Area Campground | Water - NPDES Commercial Renewal | Bude | Franklin |
| USDA Forest Service, Clear Springs Recreation Area Dump Station | Water - NPDES Commercial Renewal | Bude | Franklin |
| Union For Reform Judaism, Henry S Jacobs Camp | Water - NPDES Commercial Renewal | Utica | Hinds |
| Union POTW | Water - NPDES Minor Municipal Renewal | Union | Newton |
| Upward Properties LLC, Cottonwood Acres Mobile Home Park | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Utility Services LLC, Greenbriar Subdivision | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Utility Services LLC, Lake Village Estates, Northridge and Windance | Water - NPDES Commercial Renewal | Gulfport | Harrison |
| Verona POTW | Water - NPDES Major Municipal Renewal | Verona | Lee |
| Vicksburg Forest Products LLC, Waltersville Lumber Mill | Air - Title V Modification | Vicksburg | Warren |
| Vicksburg MHP Inc, Pierce Trailer Park | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Vicksburg POTW | Water - NPDES Major Municipal Renewal | Vicksburg | Warren |
| WPS Development, LLC, West Pass Station | Water Quality - 401 Certification | Pass Christian | Harrison |
| Wade Aviation Inc | Water - State Operating Permit Renewal | Calhoun City | Calhoun |
| Walnut Grove POTW | Water - NPDES Minor Municipal Renewal | Walnut Grove | Leake |
| Walnut POTW | Water - NPDES Minor Municipal Renewal | Walnut | Tippah |
| Walthall County Public Schools, Dexter School | Water - State Operating Permit Renewal | Tylertown | Walthall |
| Walthall County Public Schools, Salem Attendance Center | Water - NPDES Commercial Renewal | Salem | Walthall |
| Wards of Seminary Inc | Water - State Operating Permit Renewal | Seminary | Covington |
| Waring Oil Company, LLC, Industrial Road Convenience Store | Water Quality - 401 Certification | Pascagoula | Jackson |
| Warren County Port Commission, Ceres Industrial Interplex | Water - NPDES Minor Industrial Renewal | Vicksburg | Warren |
| Warren County Port Commission, Project Snowball | Water Quality - 401 Certification | Vicksburg | Warren |
| Waste Water Solutions LLC, Backwater Subdivision | Water - State Operating Permit Renewal | Hattiesburg | Lamar |
| Waste Water Solutions LLC, Chapel Woods Subdivision | Water - NPDES Commercial Modification | Meridian | Lauderdale |
| Waste Water Solutions LLC, Eagle Point | Water - NPDES Commercial Renewal | Collinsville | Lauderdale |
| Waste Water Solutions LLC, The Fountains at North Shore | Water - State Operating Permit Renewal | Brandon | Rankin |
| Wayne County School District, Buckatunna Elementary | Water - NPDES Commercial Renewal | Buckatunna | Wayne |
| Waynesboro POTW | Water - NPDES Major Municipal Renewal | Waynesboro | Wayne |
| Weekend Cabin Inc, Circle 7 Compound | Water - State Operating Permit Renewal | McComb | Pike |
| Weir POTW | Water - NPDES Minor Municipal Renewal | Weir | Choctaw |
| West Point POTW, West | Water - NPDES Major Municipal Renewal | West Point | Clay |
| Westlake Chemicals and Vinyls LLC | Air - Title V Admin Mod | Aberdeen | Monroe |
| Westlake Chemicals and Vinyls LLC | Water - Pretreatment ADMIN | Aberdeen | Monroe |
| Wet Mine Assets Holding LLC, Middle Pit | Water Quality - 401 Certification | Nicholson | Pearl River |
| Weyerhaeuser NR Company, Philadelphia Facility | Water - Pretreatment Modification | Philadelphia | Neshoba |
| Weyerhaeuser NR Company, Philadelphia Facility | Air - Air-Construction PSD | Philadelphia | Neshoba |
| Wildlife Mississippi, Upper Pearl Mitigation Bank | Water Quality - 401 Certification | Carthage | Leake |
| Williams Crematory Inc | Air - Construction Permit | Tunica | Tunica |
| Williams Equipment and Supply | Water - NPDES Minor Industrial Renewal | Shannon | Lee |
| Willie Keith Turnage, Dairy | Water - State Operating Permit Renewal | Foxworth | Walthall |
| Winston Plywood and Veneer LLC | Water - State Operating Permit Renewal | Louisville | Winston |
| Woods Development Corporation, Retail Center | Water - State Operating Permit Renewal | Hattiesburg | Lamar |
| Yalobusha County Board of Supervisors, Wastewater Treatment Facility | Water - State Operating Permit Renewal | Oakland | Yalobusha |
| Yazoo City POTW | Water - NPDES Major Municipal Renewal | Yazoo City | Yazoo |