| Business | Phone |
| Asi Alarms 56 Mayhew Way # F, Walnut Creek 94597 | (925) 933-6141 |
| Denalect Alarm Co 1309 Pine St, Walnut Creek 94596 | (925) 932-2211 |
| Aaa Alarm Co 2081 Norris Rd, Walnut Creek 94596 | (925) 934-6117 |
| Advanced Design Security Walnut Creek 94596 | (925) 946-0569 |
| Alert Alarm Walnut Creek 94596 | (925) 935-2313 |
| Diablo Alarm Walnut Creek 94596 | (925) 933-8334 |
| Frank's Alarm Co Po Box 4601, Walnut Creek 94596 | (925) 932-7607 |
| Security Plus Po Box 3026, Walnut Creek 94598 | (925) 798-4263 |
| Valley Alarm Walnut Creek 94596 | (925) 944-5199 |