| Business | Phone |
| Allied Refrigeration Inc 1590 Solano Way # B, Concord 94520 | (925) 825-5711 |
| E B Ward & Co 2301 Arnold Industrial Way # C, Concord 94520 | (925) 825-1540 |
| Rsd/Total Control 1340 Galaxy Way # H-J, Concord 94520 | (925) 674-1166 |
| Advanced Cooling Tower Tech 1470 Enea Cir, Concord 94520 | (925) 808-6480 |
| Edward B Ward & Co 2301 Arnold Industrial Way # C, Concord 94520 | (925) 825-1540 |