| CICytec Industries, Inc., Willow Island | Willow Island | — | ◐ LIKELY ACTIVE |
| ESElementis Specialties - New Martinsville Plant | Proctor | — | ◐ LIKELY ACTIVE |
| TGTroy Group, Inc., Wheeling | Wheeling | 100–499 | ◐ LIKELY ACTIVE |
| UTUnivation Technologies LLC - Catalyst Plant | South Charleston | — | ◐ LIKELY ACTIVE |
| WHWillert Home Prods | Kenova | — | ◐ LIKELY ACTIVE |
| ZCZinsser & CO INC New Parks Div | Lesage | — | ◐ LIKELY ACTIVE |
| ZLZoetis LLC | Saint Marys | — | ◐ LIKELY ACTIVE |
| SCSynectic CORP | St Albans | — | ◇ UNVERIFIED |
| AEAllegheny Energy Pleasants Power Station | Belmont | — | ◐ LIKELY ACTIVE |
| AMAoc Materials, INC | Kenova | — | ◐ LIKELY ACTIVE |
| CWCelanese - Washington Works | Washington | 100–499 | ◐ LIKELY ACTIVE |
| CLCovestro LLC | Proctor | — | ◐ LIKELY ACTIVE |
| CICytec Industries INC - Willow Island Plant | Belmont | — | ◐ LIKELY ACTIVE |
| EDEmpire Diversified Energy LLC | Follansbee | — | ◐ LIKELY ACTIVE |
| IWInnovative Water Care LLC (formerly Clearon Corporation) | South Charleston | — | ◐ LIKELY ACTIVE |
| KMKenton Meadows - Fast Fuel Food Stores INC | Gassaway | — | ◐ LIKELY ACTIVE |
| MUMinova USA INC | Bluefield | — | ◐ LIKELY ACTIVE |
| PSPhoenix Solutions, LLC | Morgantown | — | ◐ LIKELY ACTIVE |
| TSTcl Specialties LLC | Proctor | — | ◐ LIKELY ACTIVE |
| TNTeMa North America LLC | Kearneysville | 20–99 | ◐ LIKELY ACTIVE |
| UCUnion Carbide Corporation-institute | Institute | 20–99 | ◐ LIKELY ACTIVE |
| WHWashington Homeopathic Products, INC. | Berkeley Springs | — | ◐ LIKELY ACTIVE |
| WVWest Virginia Methanol, Inc, Pleasants County | St. Marys | — | ◐ LIKELY ACTIVE |
| GCGoodrich Corporation, Union | Union | — | ◐ LIKELY ACTIVE |
| M3Mc (us) 3 LLC | Dunbar | — | ◐ LIKELY ACTIVE |
| M3Mc (us) 3 Llc, Glutaraldehyde Plant | Dunbar | — | ◐ LIKELY ACTIVE |
| MPMylan Pharmaceuticals, Inc., Morgantown | Morgantown | — | ◐ LIKELY ACTIVE |
| SISabic Innovative Plastics US LLC | Washington | — | ◐ LIKELY ACTIVE |
| SOSf Opco, Llc, Reedsville | Reedsville | — | ◐ LIKELY ACTIVE |
| UCUnion Carbide Corporation - Ucc Technology Park Operations | South Charleston | — | ◐ LIKELY ACTIVE |
| YIYunigen INC. | Morgantown | — | ◐ LIKELY ACTIVE |
| AIAc&s, Inc., Nitro | Nitro | — | ◇ UNVERIFIED |
| APAdell Plastics, INC. | Petersburg | — | ◇ UNVERIFIED |
| AUAirgas USA LLC | Poca | — | ◇ UNVERIFIED |
| AFAmerican Foam Technologies | Maxwelton | — | ◇ UNVERIFIED |
| AFAmerican Foam Technologies | Ronceverte | — | ◇ UNVERIFIED |
| ARAtlantic Research Corporation | Kearneysville | — | ◇ UNVERIFIED |
| AFAugusta Fiberglass - Longview | Maidsville | — | ◇ UNVERIFIED |
| BRBayer Research and Development | Weirton | — | ◇ UNVERIFIED |
| BMBrenntag Mid-south, INC | Nitro | — | ◇ UNVERIFIED |
| CSCamc - Solutions | Charleston | — | ◇ UNVERIFIED |
| CCColumbian Chemcials Company | Proctor | — | ◇ UNVERIFIED |
| CCColumbian Chemicals Company | Proctor | — | ◇ UNVERIFIED |
| CCCongo Corporation | Chester | — | ◇ UNVERIFIED |
| CMCreo Manufacturing America LLC | Middleway | — | ◇ UNVERIFIED |
| CACustom Applicators | Pettyville | — | ◇ UNVERIFIED |
| CCCycle Center | Huntington | — | ◇ UNVERIFIED |
| DRDwr Research CO | Pennsboro | — | ◇ UNVERIFIED |
| ESElementis Specialties, INC. | Charleston | — | ◇ UNVERIFIED |
| EIEnviromine, INC. | Nitro | — | ◇ UNVERIFIED |