| Business | Phone |
| Aeron Western Regional Lab 500 Wall St # 1507, Seattle 98121 | (206) 443-7721 |
| Alden Analytical Laboratories 1001 Sw Klickitat Way # 108, Seattle 98134 | (206) 623-3660 |
| American Standards Testing Seattle 98101 | (206) 624-1110 |
| Analytical Resources 4611 S 134th Pl 100, Seattle 98168 | (206) 695-6200 |
| Nvl Laboratories Inc 1211 N 41st St, Seattle 98103 | (206) 547-0100 |
| Emerald City Forensics Inc 4253 Woodland Park Ave N, Seattle 98103 | (206) 623-0644 |
| Federal Testing Laboratories 4900 9th Ave Nw 100, Seattle 98107 | (206) 706-9904 |
| Friedman & Bruya Inc 3012 16th Ave W, Seattle 98119 | (206) 285-8282 |
| Herbal Focus Inc 6910 56th Ave Ne, Seattle 98115 | (206) 524-1722 |
| Micro-Chem Laboratories Inc 3927 Aurora Ave N 201, Seattle 98103 | (206) 633-3637 |
| R & Brooks 3958 6th Ave Nw, Seattle 98107 | (206) 632-3020 |
| Robb Precision Tool Svc 3252 Nw 56th St, Seattle 98107 | (206) 789-2326 |
| Laucks Testing Laboratories 940 S Harney St, Seattle 98108 | (206) 767-5060 |
| Pace Analytical Laboraties Inc. 921 S Harney St, Seattle 98108 | (206) 767-5060 |
| Mde Inc 700 S Industrial Way, Seattle 98108 | (206) 622-2007 |
| Northwest Calibration Systems 5700 6th Ave S 101, Seattle 98108 | (206) 762-2515 |
| Northwest Laboratories 241 S Holden St, Seattle 98108 | (206) 763-6252 |
| Pyrometric Service Co 1312 S 96th St, Seattle 98108 | (206) 762-6488 |
| Rosetta Inpharmatics Llc 401 Terry Ave N, Seattle 98109 | (206) 802-7000 |
| Valid Results Inc 3030 Ne 97th St, Seattle 98115 | (206) 522-5665 |
| Lab/Cor Inc 7619 6th Ave Nw, Seattle 98117 | (206) 781-0155 |
| Otto Rosenau & Assoc 6747 M L King Jr Way S, Seattle 98118 | (206) 725-4600 |
| Nvl Microlab 11000 Lake City Way Ne A100, Seattle 98125 | (206) 361-1858 |
| Samuel Corp 2535 Airport Way S, Seattle 98134 | (206) 903-8624 |
| Molecular Epidemiology 15300 Bothell Way Ne, Seattle 98155 | (206) 522-5432 |
| Qed Inc 17171 Bothell Way Ne, Seattle 98155 | (206) 768-0110 |
| Northern Industrial Hygiene 215 Sw 153rd St, Seattle 98166 | (206) 988-1746 |
| Nvl Laboratories 18000 International Blvd 1105, Seattle 98188 | (206) 431-1000 |
| Pacific Rim Environmental 6510 Southcenter Blvd 4, Seattle 98188 | (206) 244-8965 |
| Saybolt Inc 18251 Cascade Ave S, Seattle 98188 | (425) 656-3663 |
| Olympic Scientific Inc 4246 24th Ave W, Seattle 98199 | (206) 623-5998 |