| Business | Phone |
| Abono Design & Engineering Inc 3371 California Blvd, Napa 94558 | (707) 265-0683 |
| Mk2 Engineering Inc 1428 2nd St, Napa 94559 | (707) 307-1500 |
| Skyplus Limited 1098 Jordan Ln, Napa 94559 | (707) 265-0300 |
| Dahl Consulting Group 4130 Silverado Trl, Napa 94558 | (707) 337-7915 |
| Diversified Consulting 1188 3rd Ave, Napa 94558 | (707) 252-6488 |
| Parsons Brinckerhoff Constr 920 3rd St, Napa 94559 | (707) 224-0562 |
| Ron Tapper Consulting 1184 Ross Cir, Napa 94558 | (707) 252-8071 |
| Thoits Group 2196 Euclid Ave, Napa 94558 | (707) 226-1453 |
| Water Course Engineering 1732 Jefferson St, Napa 94559 | (530) 750-3072 |