Complaint Date | | Docket Number | | Case Name | | Statute | | Region |
| | CWA-03-2024-0053DN | | Virginia Truck Parts, Inc. | | CWA | | Region 03 |
| | CWA-03-2024-0061 | | City of Salem | | CWA | | Region 03 |
| | CWA-03-2024-0066DW | | Howard H. Holzmacher, Sr., Howard H. Holzmacher, Jr., and North Landin... | | CWA | | Region 03 |
| | CWA-03-2024-0067DW | | Sun Tall Pines Harbor RV, LLC d/b/a Sun Outdoors Chesapeake Bay | | CWA | | Region 03 |
| | CWA-03-2024-0069 | | TPWR Developer, LLC, CBG Building Company LLC, Bowman Consulting DC, T... | | CWA | | Region 03 |
| | CWA-03-2024-0072DW | | Litman Excavating, Inc. | | CWA | | Region 03 |
| | CWA-03-2024-0076DN | | City of Petersburg, VA | | CWA | | Region 03 |
| | CWA-03-2024-0077 | | Felman Production, LLC | | CWA | | Region 03 |
| | CWA-03-2024-0087DN | | MAX Environmental Technologies, Inc. | | CWA | | Region 03 |
| | CWA-03-2024-0089 | | Waste Recycling | | CWA | | Region 03 |
| | CWA-03-2024-0099DN | | Town of Glasgow | | CWA | | Region 03 |
| | CWA-03-2024-0110DN | | Mountain Top Public Service District | | CWA | | Region 03 |
| | CWA-03-2024-0113DN | | West Virginia Department of Transportation, Division of Highways | | CWA | | Region 03 |
| | CWA-03-2024-0114DW | | Bogarad Family Partnership | | CWA | | Region 03 |
| | CWA-03-2024-0126 | | Borough of Tamaqua | | CWA | | Region 03 |
| | CWA-03-2024-0139DN | | Scattered Acres, Inc. | | CWA | | Region 03 |
| | EPCRA-03-2024-0145 | | ChemStation Philadelphia, Ltd. | | EPCRA | | Region 03 |
| | FIFRA-03-2016-0122SS | | PuriCore Inc. | | FIFRA | | Region 03 |
| | FIFRA-03-2018-0117SS | | Alex C. Ferguson, LLC | | FIFRA | | Region 03 |
| | FIFRA-03-2024-0068SS | | Dollars Trends Inc. | | FIFRA | | Region 03 |
| | FIFRA-03-2024-0079 | | Pallet Machinery Group, Inc. | | FIFRA | | Region 03 |
| | III-2001-0007-DC | | City of Philadelphia, Enterprise Avenue Landfill/Philadelphia Internat... | | | | Region 03 |
| | III-94-26-DC | | Occidental Chemical Corp. Superfund Site | | | | Region 03 |
| | RCRA-03-2013-0105CA | | ALCATEL-LUCENT USA INC., Richmond Works Facility | | | | Region 03 |
| | RCRA-03-2018-0042 | | The Former Hercules Facility | | | | Region 03 |
| | RCRA-03-2018-0143CA | | ArcelorMittal Weirton LLC, Weirton Steel facility | | | | Region 03 |
| | RCRA-03-2018-0144CA | | Mingo Junction Steel Works, LLC, Weirton Steel facilty | | | | Region 03 |
| | RCRA-03-2020-0016TH | | Budd Site, PA Opportunity Park QOF 3 | | | | Region 03 |
| | RCRA-03-2020-0035TH | | Budd Site, PA Opportunity Park QOF 1 | | | | Region 03 |
| | RCRA-03-2020-0036TH | | Budd Site, PA Opportunity Park QOF 4 | | | | Region 03 |
| | RCRA-03-2020-0037TH | | Budd Site, PA Opportunity Park QOF 5 | | | | Region 03 |
| | RCRA-03-2021-0022TH | | National Aeronautics and Space Administration - Wallops FUDS Program, ... | | | | Region 03 |
| | RCRA-03-2022-0061CA | | Pennzoil-Quaker State Company dba SOPUS Products | | RCRA | | Region 03 |
| | RCRA-03-2022-0138CA | | Excalibur Realty Company | | RCRA | | Region 03 |
| | RCRA-03-2023-0024 | | Wheeler & Wheeler, Inc. d/b/a West End Motors | | RCRA | | Region 03 |
| | RCRA-03-2023-0046CA | | Transport Pool Corporation (former General Electric Railcar Repair Ser... | | RCRA | | Region 03 |
| | RCRA-03-2023-0112CA | | Mountain State Carbon, LLC, Mountain State Carbon Coke Plant | | RCRA | | Region 03 |
| | RCRA-03-2024-0081RA | | Max Environmental Technologies, Inc. | | RCRA | | Region 03 |
| | RCRA-03-2024-0086 | | Appalachian Timber Services, LLC | | RCRA | | Region 03 |
| | RCRA-03-2024-0118 | | University of Maryland Baltimore Washington Medical Center | | RCRA | | Region 03 |
| | RCRA-03-2024-0120 | | Keystone-Conemaugh Projects, LLC (KEY-CON) | | RCRA | | Region 03 |
| | RCRA-HQ-2024-001 | | The Chemours Company FC, LLC, Washington Works | | RCRA | | Region 03 |
| | SDWA-03-2018-0068DU | | ARG Resources, Inc. | | | | Region 03 |
| | SDWA-03-2019-0025DS | | United States Department of the Navy, Joint Base Anacostia-Bolling | | | | Region 03 |
| | SDWA-03-2020-0009DU | | Resources Preservation, Inc. f/k/a ARG Resources, Inc. | | | | Region 03 |
| | SDWA-03-2022-0038DU | | Resources Preservation, Inc., f/k/a ARG Resources, Inc. | | | | Region 03 |
| | SDWA-03-2022-0081DS | | National Railroad Passenger Corporation d/b/a Amtrak | | SDWA | | Region 03 |
| | SDWA-03-2022-0094DS | | Potomac Farms LLC | | SDWA | | Region 03 |
| | SDWA-03-2022-0142DS | | Logan County Public Service District, Northern Regional | | SDWA | | Region 03 |
| | SDWA-03-2022-0143DS | | Logan County Public Service District, Greenville | | SDWA | | Region 03 |
| | SDWA-03-2023-0005 | | Bear Lake Properties, LLC | | SDWA | | Region 03 |
| | SDWA-03-2023-0057DS | | Nelson County Service Authority, Wintergreen Water System | | SDWA | | Region 03 |
| | SDWA-03-2023-0061DS | | Dickenson County Public Service Authority, Big Caney | | SDWA | | Region 03 |
| | SDWA-03-2023-0062DS | | Cheat View Public Service District | | SDWA | | Region 03 |
| | SDWA-03-2024-0030DS | | Leadsville Public Services District | | SDWA | | Region 03 |
| | SDWA-03-2024-0033DS | | United States Army, Aberdeen Proving Ground – Edgewood Area | | SDWA | | Region 03 |
| | TSCA-03-2021-0055 | | Prominent Painters, LLC d/b/a Fresh Coat Painters of Charleston | | TSCA | | Region 03 |
| | TSCA-03-2021-0057 | | Omar B. Construction LLC | | TSCA | | Region 03 |
| | TSCA-03-2023-0045 | | I360 Rentals | | TSCA | | Region 03 |
| | TSCA-03-2024-0146 | | Big Idea Group Realty, Inc. d/b/a Big Realty Property Management | | TSCA | | Region 03 |