| Business | Phone |
| Hygenetics Environmental 621 E Butterfield Rd, Lombard 60148 | (630) 353-4480 |
| Secor International Inc 446 Eisenhower Ln N, Lombard 60148 | (630) 792-1680 |
| Trc Environmental Corp 71 Eisenhower Ln S, Lombard 60148 | (630) 792-0548 |
| Veolia Environmental Svc 700 E Butterfield Rd 201, Lombard 60148 | (630) 218-1647 |
| Versar Inc 100 W 22nd St, Lombard 60148 | (630) 268-8555 |