| Business | Phone |
| Aventurine Engineering Inc 9 S Washington St 519, Spokane 99201 | (509) 747-3900 |
| Hdr Engineering Inc 9 S Washington St, Spokane 99201 | (509) 744-1695 |
| Hdr Engineering Inc 1817 E Springfield Ave G, Spokane 99202 | (509) 536-8158 |
| M & T Engineering Spokane 99206 | (509) 891-6283 |
| Resource Development Assoc 9 S Washington St 500, Spokane 99201 | (509) 838-9190 |
| Saywers Engineering 327 W 8th Ave 202, Spokane 99204 | (509) 744-0300 |
| Sisul Engineering 1522 N Washington St, Spokane 99201 | (509) 325-5078 |
| Ums 907 E 26th Ave, Spokane 99203 | (509) 624-7909 |