| A Da Hi Utility Inc | Water - NPDES Commercial Renewal | Aberdeen | Monroe |
| ABB Motors and Mechanical Inc | Water - State Operating Permit Renewal | Columbus | Lowndes |
| ADLAM Films LLC | Air - SMOP Modification | Shannon | Lee |
| AITX Railcar Services LLC, Brookhaven Facility | Air - Construction Permit Modification | Brookhaven | Lincoln |
| APAC-Mississippi, Inc. (d.b.a. Krystal Gravel, Inc.) | Air - Construction Permit | Crystal Springs | Copiah |
| Ackerman POTW | Water - NPDES Minor Municipal Renewal | Ackerman | Choctaw |
| 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 |
| Alcorn County School District, Kossuth High School | Water - NPDES Commercial Renewal | Kossuth | Alcorn |
| Aluminum Dynamics, LLC | Water Quality - 401 Certification | Columbus | Lowndes |
| Aluminum Dynamics, LLC | Air - Air-Construction PSD | Columbus | Lowndes |
| Amalgamated LLC, Mables Carwash | Water - State Operating Permit Renewal | Holly Springs | Marshall |
| AmeriPride Services Inc, Durant Plant | Air - SMOP Renewal | Durant | Holmes |
| American Credit Corporation of Mississippi LLC, Pine Lakes Mobile Home Park Inc | Water - NPDES Commercial Renewal | Clinton | Hinds |
| Americas Catch Inc | Water - NPDES Minor Industrial Renewal | Itta Bena | Leflore |
| Amick Farms LLC | Air - SMOP Admin Mod | Laurel | Jones |
| Amick Farms LLC | Water - Pretreatment Modification | Laurel | Jones |
| Anchor Fabrication, Mississippi | Water - Pretreatment ADMIN | New Albany | Union |
| 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 |
| Ashland POTW, East | Water - NPDES Minor Municipal Renewal | Ashland | Benton |
| Attala County School District, Greenlee Elementary School | Water - NPDES Commercial Renewal | McCool | Attala |
| Attala County School District, Long Creek Elementary School | Water - NPDES Commercial Renewal | Sallis | Attala |
| Attala County School District, McAdams High School | Water - NPDES Commercial Renewal | McAdams | Attala |
| B and G Utilities Inc, Brookwood Subdivision | Water - NPDES Commercial Renewal | Jackson | Hinds |
| BB Recycling, LLC | Solid Waste - Rubbish ADMIN | Crystal Springs | Copiah |
| Bakelite Chemicals LLC, Taylorsville | Water - NPDES Storm Renewal | Taylorsville | Smith |
| Bakelite Chemicals LLC, Taylorsville | Water - Pretreatment ADMIN | Taylorsville | Smith |
| Baldwyn POTW | Water - NPDES Minor Municipal Renewal | Baldwyn | Lee |
| Bassfield POTW | Water - NPDES Minor Municipal Renewal | Bassfield | Jefferson Davis |
| Batesville POTW | Water - NPDES Major Municipal Renewal | Batesville | Panola |
| Bear Creek Holdings LLC, Iuka Residential Development | Water - State Operating Permit Renewal | Iuka | Tishomingo |
| Beaumont POTW | Water - NPDES Minor Municipal Renewal | Beaumont | Perry |
| Belvedere Terminals Company, LLC | Air - Construction Permit | Seminary | Covington |
| Benoit POTW | Water - NPDES Minor Municipal Renewal | Benoit | Bolivar |
| Bent Creek Utility Inc, Bent Creek Lagoon | Water - NPDES Commercial Renewal | Hattiesburg | Lamar |
| Bentcreek Utilities, Heritage Subdivision | Water - State Operating Permit Renewal | Hattiesburg | Lamar |
| Bethel Temple Pentecostal Church Inc | Water - State Operating Permit Renewal | Brookhaven | Lincoln |
| Beulah POTW | Water - NPDES Minor Municipal Renewal | Beulah | Bolivar |
| Biewer Sawmill Winona Inc | Air - Title V | Winona | Montgomery |
| 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 |
| Blue Mountain POTW | Water - NPDES Minor Municipal Renewal | Blue Mountain | Tippah |
| Boatman Trailer Park | Water - NPDES Commercial Renewal | West Point | Clay |
| Bogue Chitto Truck Stop Inc | Water - State Operating Permit Renewal | Bogue Chitto | Lincoln |
| Booneville POTW | Water - NPDES Major Municipal Renewal | Booneville | Prentiss |
| Bradford OKeefe Funeral Homes, Inc (dba Mississippi Gulf Coast Crematory) | Air - Construction Permit | D'Iberville | Harrison |
| Braxton Nanofiltration Plant | Water - NPDES Minor Industrial | Braxton | Simpson |
| Breakthru Ministries, Camp Timber Creek Wastewater Treatment Disposal System | Water - State Operating Permit Renewal | Pulaski | Scott |
| Briar Creek Utilities LLC | Water - NPDES Commercial Renewal | Starkville | Oktibbeha |
| Broadmoor Utilities Inc, South Broadmoor Subdivision | Water - NPDES Commercial Renewal | Natchez | Adams |
| BroomeCo Inc dba Nelsons Utility | Water - NPDES Commercial Renewal | Hattiesburg | Lamar |
| Browning Creek Neighborhood Utility Service Inc | Water - NPDES Commercial Renewal | Starkville | Oktibbeha |
| CAMLE, LLC, Parkway East Development | Water Quality - 401 Certification | Gluckstadt | Madison |
| Calgon Carbon Corporation | Water - NPDES Minor Industrial Modification | Bay St. Louis | Hancock |
| Camp Camellia LLC | Water - State Operating Permit Renewal | Hattiesburg | Forrest |
| 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 |
| Carroll Educational Foundation, Carroll Academy | Water - NPDES Commercial Renewal | Carrollton | Carroll |
| Castle Energy Equipment, LLC | Water - State Operating Permit Renewal | Meridian | Clarke |
| Cat and Cow Holdings LLC, Cat and Cow Veterinary Clinic | Water - NPDES Commercial Renewal | Olive Branch | Desoto |
| Caterpillar Inc | Water - Pretreatment Modification | Corinth | Alcorn |
| Catfish Processors LLC | Water - NPDES Minor Industrial Admin Mod | Belzoni | Humphreys |
| Centreville POTW, North | Water - NPDES Minor Municipal Renewal | Centreville | Wilkinson |
| Centreville POTW, South | Water - NPDES Minor Municipal Renewal | Centreville | Wilkinson |
| Chunky POTW | Water - NPDES Minor Municipal Renewal | Chunky | Newton |
| Chute, LLC, Creekmore Green Tree Reservoir | Water Quality - 401 Certification | Eagle Lake | Warren |
| Clarksdale POTW | Water - NPDES Major Municipal Renewal | Clarksdale | Coahoma |
| Clarksdale Public Utilities, Crossroads Energy Center | Air - Title V Renewal | Clarksdale | Coahoma |
| Collins POTW | Water - NPDES Minor Municipal Renewal | Collins | Covington |
| Cooper Marine and Timberlands Corporation | Water - NPDES Minor Industrial Renewal | Dennis | Tishomingo |
| Cooperative Energy, a Mississippi electric cooperative, Silver Creek Generating Plant | Air - Title V Renewal | Prentiss | Jefferson Davis |
| Cooperative Energy, a Mississippi electric cooperative, Sylvarena Generating Plant | Water - NPDES Minor Industrial Renewal | Bay Springs | Smith |
| Copiah County Industrial Park | Water - NPDES Minor Industrial, NPDES Minor Municipal | Gallman | Copiah |
| Copiah Lincoln Community College, Simpson County Center | Water - NPDES Commercial Renewal | Mendenhall | Simpson |
| Corinth, City of, Corinth Class II Rubbish Site | Solid Waste - Rubbish Modification | Corinth | Alcorn |
| Country Oaks LLC, Country Oaks Mobile Home Park | Water - NPDES Commercial Renewal | Raymond | Hinds |
| Craddock Oil Company, The C Store Number 301 | Water - NPDES Commercial Renewal | Summit | Pike |
| Crosby POTW | Water - NPDES Minor Municipal Renewal | Crosby | Wilkinson |
| Crowson Thornton LLC, Crowson Auto World | Water - NPDES Commercial Renewal | Louisville | Winston |
| Crystal Finishing Systems Inc | Water - Pretreatment ADMIN | Senatobia | Tate |
| Crystal Finishing Systems Inc | Air - SMOP | Senatobia | Tate |
| Crystal Finishing Systems Inc | Water - Pretreatment | Senatobia | Tate |
| Danny J Dill, Rolling Acres Mobile Home Park | Water - State Operating Permit Renewal | Tupelo | Lee |
| Davids Mobile Home Park LLC | Water - NPDES Commercial Renewal | Port Gibson | Claiborne |
| Davis Hartness Trailer Park | Water - State Operating Permit Renewal | Starkville | Oktibbeha |
| Dawn Williams dba Venus Park | Water - State Operating Permit Renewal | Brandon | Rankin |
| Denbury Onshore LLC, Little Creek EOR Facility | Air - Title V Renewal | Ruth | Pike |
| Desoto Outfitters LLP | Water - State Operating Permit Renewal | Brooklyn | Perry |
| Diamondhead Water and Sewer District | Water - NPDES Major Municipal Renewal | Diamondhead | Hancock |
| Dixie Dusters Inc | Water - State Operating Permit Renewal | Itta Bena | Leflore |
| Dixie Electric Power Association | Water - NPDES Commercial Renewal | Laurel | Jones |
| Double G Coatings Company LP | Water - Pretreatment Renewal | Jackson | Hinds |
| 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 |
| Ecru POTW | Water - NPDES Minor Municipal Renewal | Ecru | Pontotoc |
| 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 |
| Entergy Mississippi LLC, Attala Plant | Water - NPDES Major Industrial Renewal | Sallis | Attala |
| Entergy Mississippi LLC, Baxter Wilson Plant | Water - NPDES Major Industrial Renewal | Vicksburg | Warren |
| 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 |
| Enterprise Gas Processing LLC, Pascagoula Gas Processing Plant | Water - NPDES Storm Renewal | Moss Point | Jackson |
| Enviva Pellets Bond, LLC | Air - Construction Permit | Wiggins | Stone |
| Ergon Refining Inc, Fuels Terminal | Air - SMOP Admin Mod | Vicksburg | Warren |
| Eudora Utilities Association Inc, Wilson Mill Subdivision | Water - NPDES Commercial Renewal | Hernando | Desoto |
| Exide Environmental Response Trust, Florence Smelter | Water - NPDES Storm Renewal | Florence | Rankin |
| Falkner POTW | Water - NPDES Minor Municipal Renewal | Falkner | Tippah |
| 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 |
| Flora POTW | Water - NPDES Minor Municipal Renewal | Flora | Madison |
| Florence Gardens Subdivision | Water Quality - 401 Certification | Gulfport | Harrison |
| Florida Gas Transmission Company LLC, Wiggins Compressor Station Number 10 | Water - State Operating Permit Renewal | Wiggins | Perry |
| Flying Y Aero Inc | Water - State Operating Permit Renewal | Tutwiler | Tallahatchie |
| Forest Ridge Utility Company LLC, Forest Ridge Estates | Water - NPDES Commercial Renewal | Oxford | Lafayette |
| Formentera Operations LLC, South Cypress Creek Facility | Air - Title V Renewal | Waynesboro | Wayne |
| Formentera Operations LLC, West Nancy Field | Air - Title V Renewal | Vossburg | Clarke |
| Forrest County General Hospital | Air - SMOP Renewal | Hattiesburg | Forrest |
| Forrest County School District, North Forrest Attendance Center | Water - NPDES Commercial Renewal | Hattiesburg | Forrest |
| Front Porch Cafe LLC, The | Water - State Operating Permit Renewal | Pass Christian | Harrison |
| 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 |
| GPS Land Company LLC, Mobile Home Park | Water - NPDES Commercial Admin Mod | Florence | Rankin |
| Gary Rayburn dba 44 Wash and Dry | Water - State Operating Permit Renewal | Jayess | Lawrence |
| Gautier, City of, Water Treatment Facility | Water - NPDES Renewal | Gautier | Jackson |
| Gene Bennett, Pecan Park Mobile Home Community | Water - NPDES Commercial Renewal | Fenton | Hancock |
| George County Schools, Agricola Elementary School | Water - State Operating Permit Renewal | Lucedale | George |
| George County Schools, Benndale Elementary School | Water - State Operating Permit Renewal | Lucedale | George |
| George County Schools, Central Elementary School | Water - NPDES Commercial Renewal | Lucedale | George |
| George County Schools, Rocky Creek Elementary School | Water - State Operating Permit Renewal | Lucedale | George |
| 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 Renewal | Tupelo | Lee |
| Goodyear Tire and Rubber Company, The | Water - Pretreatment Renewal | Tupelo | Lee |
| Goodyear Tire and Rubber Company, The | Air - Title V Admin Mod | Tupelo | Lee |
| Grand Oaks Lake Project | Water Quality - 401 Certification | Oxford | Lafayette |
| Great River Utility Operating Company LLC, Mill Creek Subdivision | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Great River Utility Operating Company LLC, 1st Addition | Water - NPDES Commercial Renewal | Hattiesburg | Lamar |
| Great River Utility Operating Company LLC, Camden Place Subdivision | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Great River Utility Operating Company LLC, Cedar Creek Development | Water - NPDES Commercial Renewal | Natchez | Adams |
| 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, Lealand Pointe Subdivision | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Great River Utility Operating Company LLC, Longleaf Utilities | Water - NPDES Commercial Admin Mod | Petal | Forrest |
| Great River Utility Operating Company LLC, Longleaf Utilities | Water - NPDES Commercial Renewal | Petal | Forrest |
| Great River Utility Operating Company LLC, Pine Woods Mobile Home Park | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Great River Utility Operating Company LLC, Ring Road Subdivision | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Great River Utility Operating Company LLC, Roanoke Estates Subdivision | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Great River Utility Operating Company LLC, Silver Leaf Development | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Great River Utility Operating Company LLC, TMJ | Water - NPDES Commercial Admin Mod | Brandon | Rankin |
| Great River Utility Operating Company LLC, Trace Subdivision Number 4 | Water - NPDES Commercial Renewal | Hattiesburg | Lamar |
| Great River Utility Operating Company LLC, Westover West Subdivision | Water - NPDES Commercial Renewal | Hattiesburg | Lamar |
| Great River Utility Operating Company, Acadian Square Subdivision | Water - State Operating Permit Admin Mod | Petal | Forrest |
| Great River Utility Operating Company, Bellegrass Lagoon and Spray Field | Water - State Operating Permit Admin Mod | Hattiesburg | Lamar |
| Great River Utility Operating Company, LLC, Bernard Acres Subdivision | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Great River Utility Operating Company, LLC, Oak Grove Subdivision and Oak Grove Townhouses | Water - NPDES Commercial Admin Mod | Oak Grove | Lamar |
| Great River Utility Operating Company, LLC, Ridge Lake Ownership Association | Water - NPDES Commercial Admin Mod | Starkville | Oktibbeha |
| Great River Utility Operating Company, LLC, Timber Creek Apartments | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Great Southern Industries Inc | Water - Pretreatment | Jackson | Hinds |
| Green Acres Water Association Inc, East Park Subdivision | Water - NPDES Commercial Renewal | Lyon | Coahoma |
| 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 |
| Greenfield Environmental Multistate Trust LLC | Water - Pretreatment Renewal | Columbus | Lowndes |
| Greys Mobile Home Park LLC | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Grundfest and Klaus Gin Inc | Air - State Operating Permit Renewal | Cary | Sharkey |
| Gulf LNG Energy LLC, LNG Clean Energy Project | Water - NPDES Minor Industrial Renewal | Pascagoula | Jackson |
| Gulf South Pipeline Company LLC, Harrisville Compressor Station | Air - Title V Renewal | Harrisville | Simpson |
| Gulf South Pipeline Company LLC, McComb Compressor Station | Air - Title V Renewal | Jayess | Walthall |
| Gunnison POTW | Water - NPDES Minor Municipal Renewal | Gunnison | Bolivar |
| H and H Estates Inc | Water - NPDES Commercial Renewal | Lauderdale | Lauderdale |
| Hancock County Port and Harbor Commission, Stennis International Airport, Warehouse | Water Quality - 401 Certification | Kiln | Hancock |
| Hancock County Utility Authority, Southern Regional WWTP | Water - NPDES Major Municipal Renewal | Waveland | Hancock |
| Hankins Lumber Company Inc, Elliott | Air - Title V Renewal | Elliott | Grenada |
| Harbison Walker International Inc | Air - SMOP Admin Mod | Aberdeen | Monroe |
| Harbison Walker International Inc | Air - SMOP Admin Mod | Aberdeen | Monroe |
| Harrison County Utility Authority, West Biloxi POTW | Water - NPDES Major Municipal Renewal | Biloxi | Harrison |
| Hartson Kennedy Cabinet Top Company Inc (dba Hartson-Kennedy Inc.) | Air - Title V Admin Mod | Gulfport | Harrison |
| Hattiesburg Laurel Regional Airport Authority | Water - NPDES Commercial Renewal | Moselle | Jones |
| Haworth Inc., Bruce Plant | Water - Pretreatment Renewal | Bruce | Calhoun |
| Hazlehurst POTW, Activated Sludge | Water - NPDES Minor Municipal Renewal | Hazlehurst | Copiah |
| Heavenly Monuments LLC, dba Westhaven Memorial Crematory | Air - Construction Permit | Jackson | Hinds |
| Helens ChildCare | Water - State Operating Permit Renewal | Madison | Madison |
| Heritage Investment Properties LLC, Reservoir Trail Townhouses | Water - State Operating Permit Renewal | Bailey | Lauderdale |
| Hickory POTW | Water - NPDES Minor Municipal Renewal | Hickory | Newton |
| Highlands Utilities LLC, The Villages at Highlands | Water - State Operating Permit Renewal | Ellisville | Jones |
| Hilldale Water District Inc, Hilldale Water Treatment Plant Number 2, North Plant | Water - NPDES Minor Industrial Renewal | Vicksburg | Warren |
| Hilldale Water District Inc, Hilldale Water Treatment Plant, South Plant | Water - NPDES Minor Industrial Renewal | Vicksburg | Warren |
| Homestead Sewer LLC, Homestead Subdivision | Water - NPDES Commercial Renewal | Hattiesburg | Forrest |
| Hood Industries Inc | Air - Air-Construction PSD | Silver Creek | Lawrence |
| Howard Industries Inc, Ellisville Manufacturing Facility | Water - Pretreatment Renewal | Ellisville | Jones |
| Huber Engineered Woods, Shuqualak | Water Quality - 401 Certification | Shuqualak | Noxubee |
| Hunt Southland Refining Company | Air - Title V Renewal | Vicksburg | Warren |
| Hunt Southland Refining Company LLC | Air - Title V Renewal | Lumberton | Lamar |
| Hurricane Creek Rubbish and Recycling, LLC | Solid Waste - Rubbish ADMIN | Saucier | Harrison |
| Hutson Ventures LLC | Water - NPDES Commercial Renewal | Brookhaven | Lincoln |
| IDIL OBLC, LLC, Logistics and Distribution Facility | Water Quality - 401 Certification | Olive Branch | Desoto |
| Indianola POTW | Water - NPDES Major Municipal Renewal | Indianola | Sunflower |
| Institute For Marine Mammal Studies Inc, The, Research and Rehabilitation Facility | Water - NPDES Minor Industrial Renewal | Gulfport | Harrison |
| International Paper Company, Columbus Mill | Water - NPDES Major Industrial Renewal | Columbus | Lowndes |
| International Paper Company, Columbus Mill | Water - NPDES Major Industrial Admin Mod | Columbus | Lowndes |
| 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 |
| JAI Jalaram Inc, Super 8 Motel | Water - NPDES Commercial Renewal | Tupelo | Lee |
| JCUA POTW 4D | Water - State Operating Permit Renewal | Hurley | Jackson |
| 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 |
| Jackson County Board of Supervisors, Sunplex Industrial Park | Water Quality - 401 Certification | Ocean Springs | Jackson |
| Jackson County Port Authority, Moss Point Industrial and Technology Park | Water - NPDES Minor Industrial Renewal | Moss Point | Jackson |
| Jefferson Davis County Schools, Jefferson Davis Vo Tech Center | Water - NPDES Commercial Renewal | Carson | Jefferson Davis |
| Jerry A King, King Rental Properties Inc | Water - NPDES Commercial Renewal | Florence | Rankin |
| Joe Harvell, Bulldog Trailer Park | Water - NPDES Commercial Renewal | Starkville | Oktibbeha |
| 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 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 |
| KTS Real Estate LLC, Training Facility | Water Quality - 401 Certification | Flowood | Rankin |
| Keesler Air Force Base | Air - SMOP Renewal | Keesler Air Force Base | Harrison |
| Keithco Petroleum Inc, Keiths Superstore Number 155 | Water - State Operating Permit Renewal | Oloh | Lamar |
| Keiths Superstore Number 115 LLC | Water - State Operating Permit Renewal | Moselle | Jones |
| Kemira Chemicals Inc | Air - SMOP Modification | Aberdeen | Monroe |
| Kilmichael POTW | Water - NPDES Minor Municipal Renewal | Kilmichael | Montgomery |
| Kim Tuggle, Country Side RV Park | Water - State Operating Permit Renewal | Saucier | Harrison |
| Kloeckner Metals Corporation | Air - SMOP Renewal | Louisville | Winston |
| Kloeckner Metals Corporation, Weld Shop | Air - SMOP Modification | Louisville | Winston |
| Kohler Company, Hattiesburg Engine Plant | Water - State Operating Permit Renewal | Hattiesburg | Forrest |
| Kosciusko POTW, South | Water - NPDES Major Municipal Renewal | Kosciusko | Attala |
| Kuts and Kurls 3 LLC | Water - NPDES Commercial Renewal | Weir | Choctaw |
| Lake Eddins Owners Association Inc, Lake Eddins Water and Sewer Department | Water - NPDES Commercial Renewal | Pachuta | Jasper |
| Lake Pointe Apartments LLC | Water - NPDES Commercial Renewal | Starkville | Oktibbeha |
| Lake Washington Flying Service Inc | Water - State Operating Permit Renewal | Glen Allan | Washington |
| Lakeland Sales Inc, Silver Run Lakes Subdivision | Water - NPDES Commercial Renewal | Perkinston | Stone |
| Lakeview Holdings LLC, Lakeview Mobile Home Park | Water - State Operating Permit Renewal | Walls | Desoto |
| Lamar Villas Ltd, Lamar Villa Apartments | Water - NPDES Commercial Renewal | Hattiesburg | Lamar |
| Lambert POTW | Water - NPDES Minor Municipal Renewal | Lambert | Quitman |
| 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 |
| Legacy Boats LLC dba Avid Boats | Air - SMOP Modification | Amory | Monroe |
| Liberty POTW | Water - NPDES Minor Municipal Renewal | Liberty | Amite |
| Lincoln County Schools, Enterprise Attendance Center | Water - NPDES Commercial Renewal | Brookhaven | Lincoln |
| Lincoln County Schools, Enterprise Attendance Center | Water - State Operating Permit Renewal | Brookhaven | Lincoln |
| Lincoln County Schools, West Lincoln Schools | Water - NPDES Commercial Renewal | Brookhaven | Lincoln |
| Longwood Flying Service Inc | Water - State Operating Permit Renewal | Hollandale | Washington |
| Lost Mountain Mobile Home Park | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| 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 |
| Lucedale POTW | Water - NPDES Minor Municipal Renewal | Lucedale | George |
| M and M Processing LLC | Water - NPDES Minor Industrial Renewal | Biloxi | Harrison |
| MDOT, 5th District Complex | Water - NPDES Commercial Renewal | Newton | Newton |
| MDOT, Interstate 20 West, 59 South Welcome Center | Water - NPDES Commercial Renewal | Toomsuba | Lauderdale |
| MDOT, Interstate 55 South, Rest Area, Carroll | Water - NPDES Commercial Renewal | Vaiden | Carroll |
| MDOT, Interstate 55, Welcome Center, Pike | Water - NPDES Commercial Renewal | Osyka | Pike |
| MEC Inc dba The Pony | Water - NPDES Commercial Renewal | Starkville | Lowndes |
| MTD Products Company | Water - Pretreatment Modification | Verona | Lee |
| Maben POTW | Water - NPDES Minor Municipal Renewal | Maben | Webster |
| Magnolia POTW, North | Water - NPDES Minor Municipal Renewal | Magnolia | Pike |
| Marcal Natchez LLC | Air - Construction Admin Mod | Natchez | Adams |
| 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 |
| Mars Food US, LLC | Water - Pretreatment Renewal | Greenville | Washington |
| Marshall County School District, Galena Attendance Center | Water - NPDES Commercial Renewal | Holly Springs | Marshall |
| Marshall County School District, H W Byers School | Water - NPDES Commercial Renewal | Holly Springs | Marshall |
| Masonite Corporation | Water - NPDES Minor Industrial Renewal | Laurel | Jones |
| Mathiston POTW | Water - NPDES Minor Municipal Renewal | Mathiston | Choctaw |
| McComb POTW | Water - NPDES Major Municipal Renewal | McComb | Pike |
| McInnis Electric Company | Water - NPDES Commercial Renewal | Byram | Hinds |
| Mellomeade | Water Quality - 401 Certification | Brandon | Rankin |
| Mendenhall POTW | Water - NPDES Minor Municipal Renewal | Mendenhall | Simpson |
| Metaline Products Inc | Water - Pretreatment Renewal | Crystal Springs | Copiah |
| Methodist Childrens Homes | Water - NPDES Commercial Renewal | Clinton | Hinds |
| 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 |
| Mileston Cooperative Association | Water - NPDES Commercial Renewal | Tchula | Holmes |
| Miss Tracy's ABC and Me LLC | Water - NPDES Commercial Renewal | Columbus | Lowndes |
| Mississippi Baptist Convention Board, Central Hills Baptist Retreat | Water - NPDES Commercial Renewal | West | Attala |
| Mississippi Department of Corrections, Quitman County Residential Treatment Facility | Water - NPDES Commercial Renewal | Lambert | Quitman |
| Mississippi Department of Marine Resources, Cat Island Beneficial Use Site | Water Quality - 401 Certification | Biloxi | Harrison |
| 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, Elvis Presley Lake | Water - NPDES Commercial Renewal | Tupelo | Lee |
| 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, J P Coleman State Park | Water - State Operating Permit Renewal | Iuka | Tishomingo |
| Mississippi Department of Wildlife Fisheries and Parks, John Kyle State Park | Water - NPDES Commercial Renewal | Sardis | Panola |
| Mississippi Department of Wildlife Fisheries and Parks, Trace State Park | Water - NPDES Commercial Renewal | Belden | Pontotoc |
| Mississippi Lignite Mining Company | Water - NPDES Minor Industrial Modification | Ackerman | Choctaw |
| Mississippi Lime Company, dba Falco Lime | Air - SMOP Modification | Vicksburg | Warren |
| 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 Tank and Manufacturing Company dba Mississippi Tank Company | Water - Pretreatment Renewal | Hattiesburg | Forrest |
| Mississippi Wildlife Fisheries and Parks, Percy Quinn State Park | Water - NPDES Commercial Renewal | McComb | Pike |
| Mockingbird Marketplace LLC | Water - State Operating Permit Renewal | Brandon | Rankin |
| Modine Grenada LLC, CCP Facility | Water - Pretreatment Renewal | Grenada | Grenada |
| Modine Grenada LLC, OEM Plant | Water - NPDES Minor Industrial Renewal | Grenada | Grenada |
| Monroe County Board of Supervisors, Prairie Industrial Park Sewerage Wastewater Facility | Water - NPDES Minor Industrial Renewal | Prairie | Monroe |
| Monroe County School District, Hatley High School | Water - NPDES Commercial Renewal | Amory | Monroe |
| Monroe County School District, Hamilton High School | Water - NPDES Commercial Renewal | Hamilton | Monroe |
| Monroe County School District, Monroe County Career Technical Center | Water - NPDES Commercial Renewal | Aberdeen | Monroe |
| Mound Bayou POTW | Water - NPDES Minor Municipal Renewal | Mound Bayou | Bolivar |
| Murtagh Flying Service Inc | Water - State Operating Permit Renewal | Lexington | Holmes |
| NSLC Southern Inc | Air - Construction Permit | Hermanville | Claiborne |
| NTS Utility Association Inc, Tanglewood Subdivision | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Natchez POTW | Water - NPDES Major Municipal Renewal | Natchez | Adams |
| National Aeronautics and Space Administration, John C Stennis Space Center | Air - Title V Renewal | Stennis Space Center | Hancock |
| National Aeronautics and Space Administration, John C Stennis Space Center | Water - NPDES Minor Industrial Renewal | Stennis Space Center | Hancock |
| Natureplex | Water - Pretreatment Renewal | Olive Branch | Desoto |
| Nautic Star LLC | Air - Title V Admin Mod | Amory | Monroe |
| New Hopewell Community Action Inc, New Hopewell Heights | Water - State Operating Permit Renewal | Taylorsville | Covington |
| New Vision Fellowship | Water - State Operating Permit Renewal | Brandon | Rankin |
| Nicholson Water and Sewer Association Inc | Water - NPDES Commercial Renewal | Nicholson | Pearl River |
| Norfolk Corporation, Norfolk Temporary Housing | Water - State Operating Permit Renewal | Lake Cormorant | Desoto |
| North East Mississippi Electric Power Association | Water - NPDES Commercial Renewal | Oxford | Lafayette |
| North Hinds Water Association | Water - NPDES Commercial | Bolton | Hinds |
| North Lauderdale Water Association Inc | Water - NPDES Minor Industrial Renewal | Meridian | Lauderdale |
| North Pike Consolidated School District, North Pike Middle School | Water - NPDES Commercial Renewal | Summit | Pike |
| Northeast Mississippi Regional Water Supply District | Water - NPDES Minor Industrial Renewal | Fulton | Itawamba |
| Noxapater POTW, North | Water - NPDES Minor Municipal Renewal | Noxapater | Winston |
| Noxapater POTW, South | Water - NPDES Minor Municipal Renewal | Noxapater | Winston |
| Oil Dri Production Company | Water - NPDES Minor Industrial Renewal | Ripley | Tippah |
| Oil Dri Production Company | Water - Pretreatment Renewal | Ripley | Tippah |
| Oktibbeha County School District, East Oktibbeha Elementary School | Water - NPDES Commercial Renewal | Starkville | Oktibbeha |
| Old School Properties LLC, The Hill and Moor | Water - NPDES Commercial Admin Mod | Crawford | Oktibbeha |
| Orangutangs, Inc | Water - NPDES Commercial Renewal | Biloxi | Harrison |
| Oxbow Greenwood, LLC | Water - Pretreatment Renewal | Greenwood | Leflore |
| Oxford, City of, Deerfield Subdivision | Water - NPDES Commercial Renewal | Oxford | Lafayette |
| 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, Palmer Home Waste Water Lagoon | Water - State Operating Permit Renewal | Lake Cormorant | Desoto |
| Palmer Place LLC Mobile Home Park | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Parker Processing, LLC | Water - State Operating Permit Renewal | Stringer | Smith |
| 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, Turkey Creek Water Park | Water - NPDES Commercial Renewal | Decatur | Newton |
| Patrick Industries, Inc, Baymont Composites | Air - Construction Permit | Burnsville | Tishomingo |
| 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 Elementary School | Water - NPDES Commercial Renewal | Carriere | Pearl River |
| Pearl River County School District, Pearl River Central High School | Water - NPDES Commercial Renewal | Carriere | Pearl River |
| Pearl River County Utility Authority, North Hill, Phase V, 31 Big Sky | Water - State Operating Permit Renewal | Carriere | Pearl River |
| Pearson Investors Properties II LLC | Water - NPDES Minor Industrial, NPDES Commercial Renewal | Brandon | Rankin |
| 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 |
| Phenom Investments, LLC, Pinocchios Plaza | Water - NPDES Commercial Admin Mod | Saucier | Harrison |
| Philadelphia POTW | Water - NPDES Major Municipal Renewal | Philadelphia | Neshoba |
| Pickens POTW | Water - NPDES Minor Municipal Renewal | Pickens | Holmes |
| Pine Belt Regional Solid Waste Management Authority, Pine Belt Regional Landfill | Water - Pretreatment Modification | Runnelstown | Perry |
| Pine Lake Mobile Home Estates LLC | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Plaskolite South LLC | Water - Pretreatment Renewal | Olive Branch | Desoto |
| Polks Meat Products Inc, Magee Plant | Water - Pretreatment Renewal | Magee | Simpson |
| Pontotoc County Schools, South Pontotoc Attendance Center | Water - NPDES Commercial 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 |
| Precoat Mezzanine LLC, dba Precoat Metals | Water - Pretreatment Renewal | Jackson | Hinds |
| Premium Waters Inc | Water - Pretreatment Renewal | Byram | Hinds |
| Pride Auto Sales Inc | Water - NPDES Commercial Renewal | Batesville | Panola |
| Primetals Technologies USA LLC | Water - Pretreatment Renewal | Columbus | Lowndes |
| 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 | Water - NPDES Storm Admin Mod | Byhalia | Marshall |
| Quad County Environmental Solutions, LLC - Quad County Landfill | Air - Title V Renewal | Byhalia | Marshall |
| Quad County Environmental Solutions, LLC - Quad County Landfill | Air - Title V Admin Mod | Byhalia | Marshall |
| RANDS, LLC, Lewis Farms | Water Quality - 401 Certification | Gluckstadt | Madison |
| Rainbow Lakes Property Owners Association, Rainbow Lakes Subdivision | Water - NPDES Commercial Renewal | Toomsuba | Lauderdale |
| Rancho Los Fuentes | Water - State Operating Permit Renewal | Lucedale | George |
| Rankin County School District, Pisgah High School | Water - NPDES Commercial Renewal | Pisgah | Rankin |
| Rawls Springs Utility District, Creekwood Subdivision | Water - NPDES Commercial Renewal | Hattiesburg | Forrest |
| Rawls Springs Utility District, Lakewood Estates Subdivision | Water - NPDES Commercial Renewal | Maybank | Forrest |
| Rawls Springs Utility District, North Haven Subdivision | Water - NPDES Commercial Renewal | Hattiesburg | Forrest |
| Ray Nelson Broome, dba Nelsons Utility, The Woods Subdivision Phase Two | Water - NPDES Commercial Admin Mod | Purvis | Lamar |
| Rayburn Enterprizes Inc, Pine Ridge Villa | Water - State Operating Permit Renewal | Tylertown | Walthall |
| Red Creek Cabins & RV Park LLC | Water - State Operating Permit Admin Mod | Perkinston | Stone |
| Red Hills RV Park LLC | Water - State Operating Permit Renewal | Ackerman | Choctaw |
| 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 | Air - Construction Permit Modification | Stennis Space Center | Hancock |
| Renees Tumble and Cheer LLC | Water - State Operating Permit Renewal | Kossuth | Alcorn |
| Renin US LLC, A Division of Renin Corporation | Air - SMOP Renewal | Tupelo | Lee |
| Resolute FP US Inc, Grenada Operations | Air - Title V Renewal | Grenada | Grenada |
| Richard Runyon, Lauderdale Mobile Home Park | Water - NPDES Commercial Renewal | Lauderdale | Lauderdale |
| Rocket Lab USA, Stennis Archimedes Test Complex | Air - Construction Permit | Stennis Space Center | Hancock |
| Rockett Inc | Water - Pretreatment Modification | Flowood | Rankin |
| Rohm and Haas Chemicals LLC | Hazardous Waste - TSD Post-Closure Renewal | Moss Point | Jackson |
| Roxie POTW | Water - NPDES Minor Municipal Renewal | Roxie | Franklin |
| Roxul USA Inc | Water - Pretreatment ADMIN | Byhalia | Marshall |
| Ruleville POTW | Water - NPDES Minor Municipal Renewal | Ruleville | Sunflower |
| SABIC Innovative Plastics US LLC | Water - Pretreatment Renewal | Bay St. Louis | Hancock |
| SMHP LLC dba Smith Mobile Home Park | Water - NPDES Commercial Admin Mod | Clinton | Hinds |
| SXP Schulz Xtruded Products LLC | Water - Pretreatment Renewal | Hernando | Desoto |
| Salem House Banquet and Reception Hall | Water - NPDES Commercial Renewal | Picayune | Pearl River |
| Sanderson Farms LLC, Foods Division | Water - Pretreatment Renewal | Flowood | Rankin |
| Scooba POTW | Water - NPDES Minor Municipal Renewal | Scooba | Kemper |
| Scott County Schools, Scott Central Attendance Center | Water - NPDES Commercial Renewal | Forest | Scott |
| Shannon Agricultural Flying Inc | Water - State Operating Permit Renewal | Clarksdale | Coahoma |
| Shelby Air Service Inc | Water - State Operating Permit Renewal | Shelby | Bolivar |
| Sienna Utilities LLC, Sienna Fields Subdivision | Water - State Operating Permit Renewal | Sumrall | Lamar |
| Sign Fab Inc dba Charleston Sign Manufacturing | Air - SMOP Admin Mod | Charleston | Tallahatchie |
| Silver Slipper Resort and Casino | Water Quality - 401 Certification | Bay St. Louis | Hancock |
| Simmons Farm Raised Catfish Inc | Water - State Operating Permit Renewal | Yazoo City | Yazoo |
| Simpson County School District, Simpson Central School | Water - NPDES Commercial Renewal | Pinola | Simpson |
| Siwell Utility Company Inc, Owens Road Subdivision | Water - NPDES Commercial Renewal | Terry | Hinds |
| Skyline Steel LLC | Water - State Operating Permit Renewal | Iuka | Tishomingo |
| Slays Trailer Park | Water - NPDES Commercial Renewal | Hattiesburg | Forrest |
| Smithville POTW | Water - NPDES Minor Municipal Renewal | Smithville | Monroe |
| Sodoma Properties LLC, Russell Mobile Home Park | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Sonoco Protective Solutions Inc | Water - Pretreatment Renewal | Tupelo | Lee |
| Sophia Sutton Mission Assembly | Water - NPDES Commercial Renewal | Prentiss | Jefferson Davis |
| South Centreville Water Association Inc, Rolling Hills Subdivision | Water - NPDES Commercial Renewal | Centreville | Wilkinson |
| South Cherry Tree Development, LLC, Delta Landing Subdivision | Water Quality - 401 Certification | Hernando | Desoto |
| South Gate Sewer District | Water - NPDES Minor Municipal Renewal | Columbus | Lowndes |
| Southern Energy Operating LLC, Burnside Facility | Air - SMOP Renewal | Satartia | Yazoo |
| Southern Mobile Home RV Park LLC | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Southern Natural Gas Company LLC, Onward Compressor Station | Air - Title V Renewal | Cary | Sharkey |
| Southern Natural Gas Company LLC, Rose Hill Compressor Station | Air - Construction Permit | Enterprise | Clarke |
| Southwire Company LLC | Air - SMOP Modification | Starkville | Oktibbeha |
| Springfield Services LLC | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Steel Dynamics Columbus LLC | Air - Title V Renewal | Columbus | Lowndes |
| Stella Jones Corporation Durant | Air - Construction Permit | Durant | Holmes |
| Stella Jones Corporation Durant | Air - Title V | Durant | Holmes |
| Stella-Jones Corporation- Wiggins | Water - Pretreatment ADMIN | Wiggins | Stone |
| 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 |
| Super Sagless Hardware, A Division of Leggett and Platt Components Company, Inc. | Water - State Operating Permit Renewal | Tupelo | Lee |
| Tate County School District, East Tate Elementary School | Water - NPDES Commercial Renewal | Coldwater | Tate |
| Tate County School District, Strayhorn Elementary School | Water - NPDES Commercial Renewal | Sarah | Tate |
| Tchula POTW | Water - NPDES Minor Municipal Renewal | Tchula | Holmes |
| Tennessee Gas Pipeline Company LLC, Columbus Compressor Station Number 546 | Air - Title V Renewal | Columbus | Lowndes |
| Texas Gas Transmission LLC, Greenville Compressor Station | Air - Title V Renewal | Greenville | Washington |
| 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 |
| Thurman Trailer Park | Water - NPDES Commercial Renewal | Carson | Jefferson Davis |
| Tishomingo Acquisition LLC, dba TBEI, Tishomingo | Water - Pretreatment Renewal | Tishomingo | Tishomingo |
| Tracy Chaney dba Stick Wagon Cafe | Water - State Operating Permit Renewal | Union | Neshoba |
| Transcontinental Gas Pipe Line Company LLC, Compressor Station 80 | Air - Title V Renewal | Heidelberg | Jones |
| Trash Hunters Inc, City of Durant Sanitary Landfill | Water - Pretreatment Renewal | Durant | Holmes |
| Triple J Dairy, LLC | Water - State Operating Permit Renewal | Jayess | Lincoln |
| Tronox LLC, Hamilton Facility | Air - Title V Renewal | Hamilton | Monroe |
| Tronox LLC, Hamilton Facility | Solid Waste - Non Mun Landfill Renewal | Hamilton | Monroe |
| Trulite Glass and Aluminum Solutions LLC | Water - Pretreatment Renewal | Grenada | Grenada |
| Tunica County Utility District, Mhoon Sewer Facility | Water - NPDES Commercial Renewal | Tunica | Tunica |
| Twin Lakes Farm LLC | Water - NPDES Commercial Renewal | Starkville | Oktibbeha |
| Tyson Farms Inc | Water - Pretreatment Renewal | Vicksburg | Warren |
| US Army COE, Aberdeen Lock and Dam, East | Water - State Operating Permit Renewal | Aberdeen | Monroe |
| 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 COE, Piney Grove Recreational Area and Campground | Water - NPDES Commercial Renewal | New Site | Prentiss |
| US Army COE, Sardis Lower Lake Recreation | Water - NPDES Commercial Renewal | Sardis | Panola |
| USA Yeast Company LLC | Air - SMOP Renewal | Hattiesburg | Forrest |
| Union County School District, East Union Attendance Center | Water - NPDES Commercial Renewal | Blue Springs | Union |
| Union County School District, West Union Attendance Center | Water - NPDES Commercial Renewal | Myrtle | Union |
| Union POTW | Water - NPDES Minor Municipal Renewal | Union | Newton |
| United Furniture Industries Inc, Wren Industrial Park Sewer System | Water - NPDES Minor Industrial Renewal | Nettleton | Monroe |
| University Of Mississippi, The | Water - NPDES Minor Municipal Renewal | University | Lafayette |
| University Of Mississippi, The | Air - Title V Renewal | University | Lafayette |
| University Of Mississippi, University of Mississippi Field Station | Water - NPDES Commercial Renewal | Abbeville | Lafayette |
| Upward Properties LLC, Cottonwood Acres Mobile Home Park | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Vicksburg Forest Products LLC, Waltersville Lumber Mill | Air - Title V Modification | Vicksburg | Warren |
| Vicksburg MHP LLC, Pierce Trailer Park | Water - NPDES Commercial Admin Mod | Vicksburg | Warren |
| Vicksburg MHP LLC, Pierce Trailer Park | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Vicksburg POTW | Water - NPDES Major Municipal Renewal | Vicksburg | Warren |
| Vicksburg Warren School District, Beechwood Elementary School | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Vicksburg Warren School District, South Park Elementary | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| Vicksburg Warren School District, Warren Central High School | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| W A Kitchens Inc, Bovina Truckstop | Water - NPDES Commercial Renewal | Vicksburg | Warren |
| WDAM License Subsidiary, WDAM TV | Water - State Operating Permit Renewal | Moselle | Jones |
| WPS Development, LLC, West Pass Station | Water Quality - 401 Certification | Pass Christian | Harrison |
| 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 |
| Waring Oil Company, LLC, Industrial Road Convenience Store | Water Quality - 401 Certification | Pascagoula | Jackson |
| 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, Cotton Gin | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Waste Water Solutions LLC, Poplar Ridge Subdivision | Water - NPDES Commercial Renewal | Meridian | Lauderdale |
| Waste Water Solutions LLC, The Fountains at North Shore | Water - State Operating Permit Renewal | Brandon | Rankin |
| Water Way Inc | Air - Title V Renewal | Iuka | Tishomingo |
| 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 |
| Wesson POTW | Water - NPDES Minor Municipal Renewal | Wesson | Copiah |
| West POTW | Water - NPDES Minor Municipal Renewal | West | Holmes |
| West Point Consolidated School District, West Clay Elementary School | Water - NPDES Commercial Renewal | Montpelier | Clay |
| Weyerhaeuser NR Company, Philadelphia Facility | Water - Pretreatment Modification | Philadelphia | Neshoba |
| Wildlife Mississippi, Upper Pearl Mitigation Bank | Water Quality - 401 Certification | Carthage | Leake |
| Wilkinson County School District, Martin Luther King Career and Technology Center | Water - NPDES Commercial Renewal | Woodville | Wilkinson |
| Wilkinson County School District, Wilkinson County High School | Water - NPDES Commercial Renewal | Woodville | Wilkinson |
| Williams Equipment and Supply | Water - State Operating Permit | Shannon | Lee |
| Wilsons Meathouse Inc | Water - NPDES Minor Industrial Renewal | Crystal Springs | Copiah |
| Winston Plywood and Veneer LLC | Water - State Operating Permit Renewal | Louisville | Winston |
| Woodville POTW | Water - NPDES Minor Municipal Renewal | Woodville | Wilkinson |
| Woodville, Town of, Wilkinson County Correctional Facility | Water - NPDES Commercial Renewal | Woodville | Wilkinson |
| Wright Rental Holdings LLC | Water - State Operating Permit Renewal | Houston | Chickasaw |
| Yazoo City POTW | Water - NPDES Major Municipal Renewal | Yazoo City | Yazoo |
| Yazoo County School District, Bentonia Gibbs School | Water - NPDES Commercial Renewal | Bentonia | Yazoo |
| Yazoo Mississippi Delta Levee Board, Yazoo Pass Shop | Water - State Operating Permit Renewal | Friars Point | Coahoma |