| Business | Phone |
| Vaughn's Security & Comms 5061 Reservation Rd, Placerville 95667 | (530) 672-3133 |
| Eye On Alarm Inc 3203 Bear Ct, Placerville 95667 | (530) 344-1000 |
| Nav Tec 1774 Broadway, Placerville 95667 | (530) 676-9322 |
| Navtec 1774 Broadway, Placerville 95667 | (530) 642-1840 |
| Sierra Security & Fire Po Box 2498, Placerville 95667 | (530) 644-3003 |
| Signal Service 675 Placerville Dr, Placerville 95667 | (530) 622-4060 |