| Business | Phone |
| Davis Perk Testing & Constr Co 3460 Burnside Rd, Sebastopol 95472 | (707) 823-9123 |
| Piranaco Inc Po Box 2109, Sebastopol 95473 | (707) 865-2515 |
| Rich Engineering 3859 Ross Rd, Sebastopol 95472 | (707) 829-5263 |
| Sbragia Septic Svc Sebastopol 95472 | (707) 823-2468 |
| Septic Trouble Shooters Po Box 843, Sebastopol 95473 | (707) 823-4036 |