 Jax INC | Menomonee Falls | 20–99 | ● ACTIVE |
| SRSuperior Refinery CO. | Superior | 100–499 | ● ACTIVE |
 Pitlik & Wick, INC | Eagle River | — | ● ACTIVE |
 Skoglund Oil Co., INC. | New Richmond | — | ● ACTIVE |
| MIMidwest Industrial Fuel INC | La Crosse | 1–19 | ◐ LIKELY ACTIVE |
| PCPetron CORP | New Berlin | 20–99 | ◐ LIKELY ACTIVE |
| RORock Oil Refining INC | Stratford | 20–99 | ◐ LIKELY ACTIVE |
| UOUS Oil Lubricant Blending Plant | Kimberly | — | ◇ UNVERIFIED |
| BWBlended Waxes, INC. | Oshkosh | — | ◐ LIKELY ACTIVE |
| RRRock Road Companies INC - Townline Pit | Beloit | — | ◐ LIKELY ACTIVE |
| AAAmerican Asphalt of Wi (plant 22-shop-lab) | Mosinee | — | ◇ UNVERIFIED |
| AIAmsoil INC - Amsoil Center | Superior | — | ◇ UNVERIFIED |
| ALAngelo Luppino, INC. | Hurley | — | ◇ UNVERIFIED |
| AWA W Oakes and Son INC | Racine | — | ◇ UNVERIFIED |
| BOBenz Oil Corporation | Milwaukee | — | ◇ UNVERIFIED |
| CRCri Recycling Service INC | Woodville | — | ◇ UNVERIFIED |
| ECEau Claire Asphalt Corporation | Eau Claire | — | ◇ UNVERIFIED |
| FHFlint Hills Resources Pine Bend, LLC | Stevens Point | — | ◇ UNVERIFIED |
| FHFlint Hills Resources Pine Bend, LLC | Green Bay | — | ◇ UNVERIFIED |
| HGHenry G Meigs | Abbotsford | — | ◇ UNVERIFIED |
| HGHenry G. Meigs, LLC | Portage | — | ◇ UNVERIFIED |
| JIJax INC | Menomonee Falls | — | ◇ UNVERIFIED |
| LWL & W Construction | Markesan | — | ◇ UNVERIFIED |
| MCMathy Construction Company - Plant 25 | Onalaska | — | ◇ UNVERIFIED |
| RURs Used Oil Services INC (former) | Wheatland | — | ◇ UNVERIFIED |
| RCRusk County Highway Department | Ladysmith | — | ◇ UNVERIFIED |
| SSSafety-kleen Systems INC - Kimberly Facility - Fka U S Oil | Kimberly | — | ◇ UNVERIFIED |
| SPStark Pavement CORP | Milwaukee | — | ◇ UNVERIFIED |
| TCTrempealeau County Highway Dept | Whitehall | — | ◇ UNVERIFIED |
| ACAMSOIL Corporate | Superior | 100–499 | ◐ LIKELY ACTIVE |
| AIAmsoil INC. (mke) | Milwaukee | 20–99 | ◐ LIKELY ACTIVE |
| AAMSOIL (Superior) | Superior | 100–499 | ◐ LIKELY ACTIVE |
| ACAsphalt Contractors, Inc. | Union Grove | 20–99 | ◐ LIKELY ACTIVE |
| LKLubricants Kimberly | Kimberly | 1–19 | ◐ LIKELY ACTIVE |
| SPStark Pavement CORP | Brookfield | — | ◐ LIKELY ACTIVE |
| LILubematrix INC. | Milwaukee | — | ◐ LIKELY ACTIVE |
| AAAmerican Asphalt Division Plant #22 | Kronenwetter | — | ◇ UNVERIFIED |
| BCBiehl Construction CO INC | Marinette | — | ◇ UNVERIFIED |
| BBBissen Blacktop INC | Sturgeon Bay | — | ◇ UNVERIFIED |
| CACamden Alan LLC | Waterford | — | ◇ UNVERIFIED |
| CBCentral Blacktop | Galesville | — | ◇ UNVERIFIED |
| CCChippewa CO Hwy Dept Hma | Chippewa Falls | — | ◇ UNVERIFIED |
| CCCustom Chromatography Solutions LLC | Madison | — | ◇ UNVERIFIED |
| DCDeboer Custom Pavement, LLC | Milwaukee | — | ◇ UNVERIFIED |
| DLD L Gasser Construction Plant # 65 | Onalaska | — | ◇ UNVERIFIED |
| DCDoor County Highway Dept | Sturgeon Bay | — | ◇ UNVERIFIED |
| DLDrs LTD | Middleton | — | ◇ UNVERIFIED |
| FCForest County Highway Department | Crandon | — | ◇ UNVERIFIED |
| JIJax INC | Franklin | — | ◇ UNVERIFIED |
| JCJefferson County Highway Dept | Jefferson | — | ◇ UNVERIFIED |
