| Business | Phone |
| L-H Laboratory Svc 2410 1/2 Caplin St, Houston 77026 | (713) 694-4347 |
| Tex Ms Svc 8282 Bissonnet St, Houston 77074 | (713) 771-3530 |
| Columbia Analytical Svc 10655 Richmond Ave 130a, Houston 77042 | (713) 266-1599 |
| A & B Labs 10100 East Fwy, Houston 77029 | (713) 453-6060 |
| Accutest Laboratories Glfcst 10165 Harwin Dr 150, Houston 77036 | (713) 271-4700 |
| Ana-Lab Corp 18096 Kings Row H, Houston 77058 | (281) 333-9414 |
| Anacon Inc 730 Fm 1959 Rd, Houston 77034 | (281) 922-7000 |
| Bioassay Laboratories Inc 10550 Rockley Rd 150, Houston 77099 | (281) 495-6996 |
| Ca Labs Of Houston Environ Lab 5829 W Sam Houston Pkwy N, Houston 77041 | (713) 983-6336 |
| Enviro-Chem Analytical Labs 9207 Country Creek Dr 207, Houston 77036 | (713) 271-4545 |
| Envirodyne Laboratories Inc 11011 Brooklet Dr 230, Houston 77099 | (281) 568-7880 |
| Environmental Chemistry Inc 2525 W Bellfort St 175, Houston 77054 | (713) 666-0020 |
| Forensic Lab Div Inc 1001 Texas St, Houston 77002 | (713) 224-1608 |
| Metrohm Peak Inc 12521 Gulf Fwy, Houston 77034 | (281) 484-5000 |
| Geochem Laboratories Inc 1143 Brittmoore Rd C, Houston 77043 | (713) 467-7011 |
| J Winter & Assoc Forensic Lab 1001 Texas St 550, Houston 77002 | (713) 224-1800 |