| CPCoastal Plain Treating CO. | Tifton | GA | — | ◇ UNVERIFIED |
| CWCoast Wood Preserving | Ukiah | CA | — | ◇ UNVERIFIED |
| CWColeman-evans Wood Preserving CO. | Jacksonville | FL | — | ◇ UNVERIFIED |
| CWColonie Wood & Staining CORP | Albany | NY | — | ◇ UNVERIFIED |
| CSColumbia Steel Casting CO INC | Portland | OR | — | ◇ UNVERIFIED |
| CPColville Post and Poles INC | Colville | WA | — | ◇ UNVERIFIED |
| CFComponent Finishing Unlimited | Louisville | KY | — | ◇ UNVERIFIED |
| CTCowboy Timber Treating INC | Manderson | WY | — | ◇ UNVERIFIED |
| CPCrop Production Services Tangent 101 | Tangent | OR | — | ◇ UNVERIFIED |
| COCulpeper of Sweetwater, LLC | Sweetwater | TN | — | ◇ UNVERIFIED |
| CWCulpeper Wood Preservers - Ruffin Creek | Fredericksburg | VA | — | ◇ UNVERIFIED |
| DFDayton Flameproof & Wood Preserving | Dayton | OH | — | ◇ UNVERIFIED |
| DTDeland Treated Forestry Products INC | Deland | FL | — | ◇ UNVERIFIED |
| DLDelmarva Lumber | Willards | MD | — | ◇ UNVERIFIED |
| DWDis-tran Wp Holdings LLC | Pineville | LA | — | ◇ UNVERIFIED |
| DRDuke Realty Limited Partnership | Miami | FL | — | ◇ UNVERIFIED |
| DID-wood INC | Union | NJ | — | ◇ UNVERIFIED |
| EHEagle Harbor Wyckoff | Bainbridge Island | WA | — | ◇ UNVERIFIED |
| ETEasterday Tie & Timber CO INC | Mayfield | KY | — | ◇ UNVERIFIED |
| ETEast Tennessee Forest Products, INC. | Midway | TN | — | ◇ UNVERIFIED |
| ETEast Tennessee Forest Products Incorporated | Mosheim | TN | — | ◇ UNVERIFIED |
| EAEd Arey & Son INC | Hodgesville | WV | — | ◇ UNVERIFIED |
| FSFairfax St. Wood Treaters | Jacksonville | FL | — | ◇ UNVERIFIED |
| FCFederal Creosote Superfund Site | Manville | NJ | — | ◇ UNVERIFIED |
| FLFeeler Lumber Superfund Site C O US Epa | Vienna | MO | — | ◇ UNVERIFIED |
| FLFerguson Lumber | Clifton Hill | MO | — | ◇ UNVERIFIED |
| FIFernwood Industries | Mccomb | MS | — | ◇ UNVERIFIED |
| FFFlorida Fence Post CO | Ona | FL | — | ◇ UNVERIFIED |
| FLFormer Linden Creosote Company Site | Linden | AL | — | ◇ UNVERIFIED |
| FWFortress Wood Products | Greensboro | NC | — | ◇ UNVERIFIED |
| FPFowler Post | Bagwell | TX | — | ◇ UNVERIFIED |
| FBFurst Brothers Company | Baltimore | MD | — | ◇ UNVERIFIED |
| GPGeorgia Pacific Corrugated LLC | Lake Placid | FL | — | ◇ UNVERIFIED |
| GWGeorgia Wood Preserving | Crawfordville | GA | — | ◇ UNVERIFIED |
| GLGlassco Lumber | Stanford | MT | — | ◇ UNVERIFIED |
| GLGloucester Lumber Products Incorporated - Dutton | Gloucester | VA | — | ◇ UNVERIFIED |
| GRGordon Redd Lumber Company, INC. | Brookhaven | MS | — | ◇ UNVERIFIED |
 Great Southern Wood - Bushnell, INC | Lake Panasoffkee | FL | — | ◇ UNVERIFIED |
| GEGreenfield Environmental Multistate Trust LLC | Kansas City | MO | — | ◇ UNVERIFIED |
| HWHager Wood Preserving LLC | Wyoming | MI | — | ◇ UNVERIFIED |
| HKHale Kauai LTD | Lihue | HI | — | ◇ UNVERIFIED |
| HLHixson Lumber Company LLC | Naucvoo | AL | — | ◇ UNVERIFIED |
| HLHixson Lumber Company, LLC | Milan | TN | — | ◇ UNVERIFIED |
| HLHixson Lumber Sales | Caddo Mills | TX | — | ◇ UNVERIFIED |
| HLHixson Lumber Sales of Illinois, INC. | Streator | IL | — | ◇ UNVERIFIED |
| HMH & M Wood Preserving INC | Gold Hill | NC | — | ◇ UNVERIFIED |
| HWHoosier Wood Preservers | Indianapolis | IN | — | ◇ UNVERIFIED |
| HTHoover Treated Wood Products, INC. | Halifax | NC | — | ◇ UNVERIFIED |
| HWHouston Wood Treatment Plant | Houston | MO | — | ◇ UNVERIFIED |
| HWHuffman Wood Preserving | Broken Bow | OK | — | ◇ UNVERIFIED |
