| Business | Phone |
| Bei Construction Inc 1340 Pine St, St Helena 94574 | (707) 967-5529 |
| Dooley Pump & Electric Po Box 183, St Helena 94574 | (707) 963-3798 |
| Harvest Electric St Helena 94574 | (707) 963-3416 |
| Hemken Electric 1121 Zygmunt Dr, St Helena 94574 | (707) 963-8256 |
| Hubert Electric Po Box 212, St Helena 94574 | (707) 963-2069 |
| Main Street Electric 1230 Main St, St Helena 94574 | (707) 963-2122 |
| St Helena Lighting & Design 550 Deer Park Rd, St Helena 94574 | (707) 963-2241 |