| Business | Phone |
| Cal-Pacific Protection Adt 1850 Gateway Blvd # 235, Concord 94520 | (925) 680-1500 |
| Pacific Alarm Co 5063 Commercial Cir, Concord 94520 | (925) 687-7233 |
| Protection One Inc 4071 Port Chicago Hwy # 150, Concord 94520 | (925) 602-5363 |
| Scheer Security Alarm Systems 1009 Shary Cir # A, Concord 94518 | (925) 827-1535 |
| Direct Security 5600 Imhoff Dr, Concord 94520 | (925) 685-9321 |
| Househould Security 1070 Concord Ave, Concord 94520 | (925) 680-1666 |
| Mach One Alarm Concord 94520 | (925) 680-2730 |
| Omni Alarm Concord 94520 | (925) 798-9550 |
| Scheer Home Systems 1009 Shary Cir # A, Concord 94518 | (925) 827-1535 |
| Security Signal Devices 200 Mason Cir, Concord 94520 | (925) 246-9902 |
| Sonitrol 1300 Galaxy Way # 6, Concord 94520 | (925) 687-1055 |