| WALC |
Western Analytical Laboratories, Inc., Chino, CA |
| WBWQ |
West Basin Water Quality Laboratory, El Segundo, CA |
| WCAS |
West Coast Analytical Services, Inc., Santa Fe Springs, CA |
| WCSO |
Watt Construction, Sherman Oaks, CA |
| WETS |
Western Environmental Testing Lab, Sparks, NV |
| WLGA |
W. L. Gore and Associates, Inc., Elkton, MD |
| WLIC |
Weck Laboratories, Inc., City of Industry, CA |
| WPEL |
City of LA Dept. Water & Power Environ. Lab, Los Angeles, CA |
| WQLC |
JWPCP Water Quality Laboratory, Carson, CA |
| WQLW |
San Jose Creek Water Quality Laboratory, Whittier, CA |
| WSLH |
Wisconsin State Laboratory of Hygiene, Madison, WI |
| ZALB |
Zalco Laboratories, Inc., Bakersfield, CA |
| ZFSL |
Zymax Forensic, San Luis Obispo, CA |
| ZXEO |
ZymaX envirotechnology, San Luis Obispo, CA |