| Company | Booth | |
|---|---|---|
| Cardno | 425 | |
| Chainbridge Technologies | 228 | |
| Chloeta | 107 | |
| CK Associates | 424 | |
| Clean Earth Systems Inc. | 131 | |
| Clean Gulf Associates | 401 | |
| Clean Harbors | 319 | |
| Cliff Berry, Inc. | 518 | |
| Cotton Logistics | 513 | |
| CRUCIAL, INC. | 510 | |
| CSA Ocean Sciences Inc. | 211 | |
| CTEH, LLC. | 429 |