| Aspen Skiing Co General File | Site Assessment | CO | Aspen |
| Asphalt Constructors Inc | Site Assessment | CO | Alamosa |
| Shot Realty Inc. | Site Assessment | CO | Denver |
| Atmel Corp | Confirmed | CO | Colorado Springs |
| Autawash One Ltd | Confirmed | CO | Englewood |
| Avis Rent A Car System LLC | Confirmed | CO | Denver |
| B&h Co | Confirmed | CO | Colorado Springs |
| Bancker Nicholls Inc | Site Assessment | CO | Denver |
| Bandimere Auto Performance Ctr Inc | Confirmed | CO | Morrison |
| Bank One Bldg C/O Galbreath Co | Site Assessment | CO | Denver |
| Bassett Construction Co | Confirmed | CO | Pueblo |
| Battlement Mesa Corp | Site Assessment | CO | Parachute |
| Bear River Valley Co-Op | Confirmed | CO | Hayden |
| Beatrice Dairy Products Inc | Site Assessment | CO | Grand Junction |
| Bee Jay Iron Inc | Site Assessment | CO | Englewood |
| Beeman's Gas & Grocery Inc | Confirmed | CO | Sedalia |
| Beeman's Gas & Grocery Inc | Confirmed | CO | Sedalia |
| Bell Plumbing & Heating Co | Confirmed | CO | Denver |
| Berta Brothers Transportation Inc | Confirmed | CO | Penrose |
| American Pride Co-Op | Confirmed | CO | Berthoud |
| FTM Express LLC dba Buruk Sinclair | Confirmed | CO | Aurora |
| FTM Express LLC dba Buruk Sinclair | Confirmed | CO | Aurora |
| FTM Express LLC dba Buruk Sinclair | Confirmed | CO | Aurora |
| Big J Jewelry And Loan, Inc. | Confirmed | CO | Grand Junction |
| Black Mule Gas Co #1 | Confirmed | CO | Pueblo |
| Sahara Global Holdings Inc | Confirmed | CO | Lakewood |
| Brad Ragan Inc | Confirmed | CO | Denver |
| Sherpa Convenience Store LLC | Confirmed | CO | Brighton |
| Sherpa Convenience Store LLC | Confirmed | CO | Brighton |
| Brookharts Inc | Confirmed | CO | Arvada |
| Brookharts Inc | Confirmed | CO | Colorado Springs |
| Broomfield Auto Service Center Inc | Site Assessment | CO | Broomfield |
| Busby Inc | Confirmed | CO | Idalia |
| C & F Incorporated | Confirmed | CO | Wheat Ridge |
| Jomax Construction Co Inc | Site Assessment | CO | Platteville |
| Capra Plumbing & Heating Inc | Site Assessment | CO | Denver |
| Car Co | Confirmed | CO | Denver |
| Caterpillar Inc | Site Assessment | CO | Denver |
| CCOD Denver General Hospital | Site Assessment | CO | Denver |
| CCW Products Inc | Confirmed | CO | Arvada |
| Century Housing Corp | Confirmed | CO | Fort Morgan |
| Amoco Oil Co | Confirmed | CO | Craig |
| Chevron USA Inc #70183 | Confirmed | CO | Gunnison |
| Chevron USA Inc #70258 | Confirmed | CO | Denver |
| Chevron USA Inc #70273 | Confirmed | CO | Commerce City |
| Chevron USA Inc #70371 | Confirmed | CO | Denver |
| Chevron USA Inc #70713 | Confirmed | CO | Fountain |
| Amoco Oil Co | Confirmed | CO | Pueblo |
| Chevron USA Inc #77991 | Confirmed | CO | Grand Junction |
| Children's Hospital Colorado | Confirmed | CO | Aurora |
| Citaula Bros. 3 Inc DBA Shop N Save | Confirmed | CO | Commerce City |
| Housing Authority of the City of Denver | Site Assessment | CO | Denver |
| City Glass Co Inc | Site Assessment | CO | Colorado Springs |
| City Ice Co | Confirmed | CO | Denver |
| Ramsay Properties Inc | Site Assessment | CO | Greeley |
| New Crystal Realty LLC | Confirmed | CO | Colorado Springs |
| Colorado Mental Health Institute | Site Assessment | CO | Denver |
| Colorado Mental Health Institute | Confirmed | CO | Denver |
| C & K Oil Inc | Confirmed | CO | Cheyenne Wells |
| CO 1564 - Castle Rock Broadcast Center | Confirmed | CO | Castle Rock |
| CO 1564 - Castle Rock Broadcast Center | Confirmed | CO | Castle Rock |
| CO DHS Western Dist - Fac Mgmt | Site Assessment | CO | Grand Junction |
| Farmland Co-Op Inc | Confirmed | CO | Fort Morgan |
| Colorado Kenworth Inc | Confirmed | CO | Greeley |
| Colorado Limousine & Hearse Co Inc | Confirmed | CO | Denver |
| Colorado Linen Co | Site Assessment | CO | Bellvue |
| Colorado Mental Health Institute At Pueblo | Confirmed | CO | Pueblo |
| 4100 Globeville LLC | Confirmed | CO | Denver |
| 4100 Globeville LLC | Confirmed | CO | Denver |
| Colorado Quarries Inc | Confirmed | CO | Canon City |
| Comelco Electric Inc | Confirmed | CO | Denver |
| Comfurt Gas Inc | Site Assessment | CO | Buena Vista |
| K&T Gas Station LLC | Confirmed | CO | Aurora |
| K&T Gas Station LLC | Site Assessment | CO | Aurora |
| Nobel Store LLC | Confirmed | CO | Brighton |
| Basin Co-op Cenex Ampride | Confirmed | CO | Durango |
| Consolidated Engineering Inc | Site Assessment | CO | Denver |
| Former Old Dominion Freight Line Inc | Confirmed | CO | Commerce City |
| Farmers Market Company | Confirmed | CO | Wheat Ridge |
| Farmers Market Company | Confirmed | CO | Wheat Ridge |
| Coors Brewing Co | Site Assessment | CO | Golden |
| Coors Distributing Co | Confirmed | CO | Denver |
| Coors Distributing Co | Site Assessment | CO | Denver |
| Coscan Inc | Confirmed | CO | Broomfield |
| Courtesy Motors Ltd | Site Assessment | CO | Colorado Springs |
| Doris Cowden (cow Inc) | Confirmed | CO | Pueblo |
| Cowen Transportation Co | Site Assessment | CO | Colorado Springs |
| Former Crandall Drilling Co | Site Assessment | CO | Strasburg |
| Crawford Properties LLC | Confirmed | CO | Carbondale |
| Ejb Ltd Liability Co | Confirmed | CO | Denver |
| CST Metro LLC DBA Corner Store #1158 | Confirmed | CO | Fort Collins |
| CST Metro LLC DBA Corner Store #1717 | Confirmed | CO | Colorado Springs |
| Cummins Power Inc | Confirmed | CO | Grand Junction |
| Cummins Power Inc | Confirmed | CO | Grand Junction |
| Cummins Power Inc | Confirmed | CO | Commerce City |
| Cummins Power Inc | Confirmed | CO | Commerce City |
| Cummins Power Inc | Confirmed | CO | Craig |
| D & D Tire Service Inc | Confirmed | CO | Aurora |
| D & E Mail Contractors Inc | Confirmed | CO | Canon City |
| Davis Bros Inc | Confirmed | CO | Akron |
| Davis Bros Inc | Confirmed | CO | Akron |
| Sent to Another Agency | Site Assessment | CO | Wheat Ridge |
| Dawn Industries Inc | Confirmed | CO | Denver |
| Dawn/baker Boy Inc | Confirmed | CO | Denver |
| Denver East Machinery Co | Site Assessment | CO | Aurora |
| Denver Moving & Storage Inc | Confirmed | CO | Denver |
| CM Colorado Springs LLC | Suspected | CO | Colorado Springs |
| Former CST Metro LLC DBA Corner Store #4122 | Confirmed | CO | Lakewood |
| Disposal & Recycling Inc | Confirmed | CO | Commerce City |
| Disposal & Recycling Inc | Confirmed | CO | Commerce City |
| Double J Enterprizes LLC | Confirmed | CO | Gunnison |
| Doug Teter & Sons Oilfield Construction Inc | Confirmed | CO | Rifle |
| Dove Creek Superette Inc | Confirmed | CO | Dove Creek |
| Dove Creek Superette Inc | Confirmed | CO | Dove Creek |
| Dove Creek Superette Inc | Site Assessment | CO | Dove Creek |
| Dow Jones & Co | Site Assessment | CO | Englewood |
| Drive Train Industries Inc | Confirmed | CO | Denver |
| Durango Market LLC | Confirmed | CO | Broomfield |
| Nelson Tire, LLC (DBA Gills Point S) | Confirmed | CO | Durango |
| Nelson Tire, LLC (DBA Gills Point S) | Confirmed | CO | Durango |
| Nelson Tire, LLC (DBA Gills Point S) | Confirmed | CO | Durango |
| Nelson Tire, LLC (DBA Gills Point S) | Confirmed | CO | Durango |
| Eagle Co Bulk Plant | Confirmed | CO | Eagle |
| Eagle Co Bulk Plant | Confirmed | CO | Eagle |
| East Evans Rental & Supply Inc | Confirmed | CO | Denver |
| East Morgan County Hospital | Site Assessment | CO | Brush |
| Power Motive Corp | Confirmed | CO | Colorado Springs |
| Elmer Glass Co | Site Assessment | CO | Glenwood Springs |
| Enron Gas Pipeline Co | Confirmed | CO | Meeker |
| Blade Runners Inc | Confirmed | CO | Littleton |
| Evergreen Oil Co #027 L&j #72 | Confirmed | CO | Pueblo |
| Evezich Oil Co | Confirmed | CO | Frederick |
| Evmars Inc | Confirmed | CO | Denver |
| Excel Corp | Confirmed | CO | Sterling |
| Saint Joseph Hospital | Confirmed | CO | Denver |
| Exxon Co USA | Confirmed | CO | Steamboat Springs |
| Exxon Co USA | Confirmed | CO | Denver |
| Exxon Co USA Ras 6 3121 | Confirmed | CO | Lakewood |
| Circle 7 CO 02 | Confirmed | CO | Colorado Springs |
| Ez Way Rentals Inc | Site Assessment | CO | Glenwood Springs |
| Ez Way Rentals Inc | Site Assessment | CO | Glenwood Springs |
| F P Oil Co | Confirmed | CO | Denver |
| Elvins Rentals & Storage Inc | Confirmed | CO | Castle Rock |
| Empire Corp | Site Assessment | CO | Henderson |
| Marshall Leasing Inc | Confirmed | CO | Denver |
| Empire Oldsmobile Inc | Confirmed | CO | Denver |
| EMRX Corp | Site Assessment | CO | Palisade |
| Ensign Bickford Co | Site Assessment | CO | Louviers |
| Ensign Well Services Inc | Site Assessment | CO | La Salle |
| Enterprise Leasing Co | Confirmed | CO | Denver |