| Business | Phone |
| Ch2m Hill 8836 W Gage Blvd, Kennewick 99336 | (509) 735-9149 |
| Dana Engineering Inc / Cooper 4000 S Irby St, Kennewick 99337 | (509) 582-0126 |
| Kennedy/Jenks Consultants 1020 N Center Pkwy F, Kennewick 99336 | (509) 734-9763 |
| Mc Kinnon & Assoc 2632 W Kennewick Ave, Kennewick 99336 | (509) 783-5085 |
| Parker Messana & Assoc Inc 7510 W Deschutes Pl, Kennewick 99336 | (509) 764-0883 |