 General Chemical Corporation (closed) | Claymont | — | ◐ LIKELY ACTIVE |
| IRIndustrial Resources Network,llc | Wilmington | — | ◐ LIKELY ACTIVE |
| NNuturell | Wilmington | — | ◐ LIKELY ACTIVE |
| WPWilmington Pharmatech Company - Pencader - 229a Lake Dr, Newark | Newark | — | ◐ LIKELY ACTIVE |
| AIAdesis, INC. | New Castle | — | ◐ LIKELY ACTIVE |
| AMAdvanced Material Technology | Wilmington | — | ◐ LIKELY ACTIVE |
| BGBoc Gases | Claymont | — | ◐ LIKELY ACTIVE |
| FFuji | New Castle | — | ◐ LIKELY ACTIVE |
| ISIntercontinental Services of Delaware | Wilmington | — | ◐ LIKELY ACTIVE |
| ISInvista S.a.r.l. Seaford Plant | Seaford | — | ◐ LIKELY ACTIVE |
| JNJax N Daisy, INC. | Dover | — | ◐ LIKELY ACTIVE |
| MOMerit Oil CO | New Castle | — | ◐ LIKELY ACTIVE |
| OCOccidental Chemical CORP | New Castle | — | ◐ LIKELY ACTIVE |
| PTPolymer Technologies, INC. | Newark | — | ◐ LIKELY ACTIVE |
| SHSiemens Healthcare Diagnostics | Newark | — | ◐ LIKELY ACTIVE |
| THThe Hibbert Group | New Castle | — | ◐ LIKELY ACTIVE |
| AMAig Marketing - 3 Beaver Valley Rd, Wilmington | Wilmington | — | ◇ UNVERIFIED |
| ALAir Liquide Industrial US LP | Delaware City | — | ◇ UNVERIFIED |
| APAir Products & Chemicals, INC. H2 Smr Plant at Delaware City Refining Company | Delaware City | — | ◇ UNVERIFIED |
| APAir Products New Castle De H2 Plant | Delaware City | — | ◇ UNVERIFIED |
| ACAkzo Chemicals INC. | Delaware City | — | ◇ UNVERIFIED |
| AWAlanx Wear Solutions INC | Newark | — | ◇ UNVERIFIED |
| AAAmerican Air Liquide-glasgow | Newark | — | ◇ UNVERIFIED |
| AGAny Garment Cleaners #106 | Wilmington | — | ◇ UNVERIFIED |
| ACArch Chemicals INC | New Castle | — | ◇ UNVERIFIED |
| APAstrazeneca Pharmaceuticals, Llc-newark | Newark | — | ◇ UNVERIFIED |
| AAAurora Agronomy | Seaford | — | ◇ UNVERIFIED |
| AEAvalon Exhibits INC | New Castle | — | ◇ UNVERIFIED |
| BCBasf Colors and Effects Usa, LLC | Newport | — | ◇ UNVERIFIED |
| BABernies Automotive | Middletown | — | ◇ UNVERIFIED |
| BCBill Cannons Garage INC | Selbyville | — | ◇ UNVERIFIED |
| BWBj's Wholesale Club #0178 | Newark | — | ◇ UNVERIFIED |
| BSBlue Swan Wilmington | Wilmington | — | ◇ UNVERIFIED |
| BOBradford Orthopedics | Dover | — | ◇ UNVERIFIED |
| BIBruce Industrial CO INC | New Castle | — | ◇ UNVERIFIED |
| CMCermet Materials INC | Wilmington | — | ◇ UNVERIFIED |
| CEChemical Equipment Labs, INC. | Wilmington | — | ◇ UNVERIFIED |
| CEChemours - Edge Moor Plant | Wilmington | — | ◇ UNVERIFIED |
| CGCiba Geigy Plant - 205 South James St, Newport | Newport | — | ◇ UNVERIFIED |
| CCClariant CORP Masterbatch Div | Milford | — | ◇ UNVERIFIED |
| CPColony Pool Service INC. | Wilmington | — | ◇ UNVERIFIED |
| CDCustom Decorative Mouldings | Greenwood | — | ◇ UNVERIFIED |
| CICytec Industries INC. | New Castle | — | ◇ UNVERIFIED |
| DPDelaware Park Racetrack & Casino | Wilmington | — | ◇ UNVERIFIED |
| DODover (city Of) Water Treatment Plant - 802 Long Point Rd, Dover | Dover | — | ◇ UNVERIFIED |
| DRDow Reichhold Specialty Latex LLC (closed) | Dover | — | ◇ UNVERIFIED |
| DCDupont Corporate | Wilmington | — | ◇ UNVERIFIED |
| DEDupont Electronic Materials Cmp, Llc-building 8 | Newark | — | ◇ UNVERIFIED |
| DHDupont Hay Road Sludge Drying Site | Wilmington | — | ◇ UNVERIFIED |
| EPEdgewell Personal Care - Plant 4 | Dover | — | ◇ UNVERIFIED |
