| Business | Phone |
| Circle Oaks County Water Dist Po Box 344, Napa 94559 | (707) 254-7796 |
| Napa Water Dept 955 School St, Napa 94559 | (707) 257-9508 |
| Napa Water Div 1600 1st St, Napa 94559 | (707) 257-9521 |
| Spanish Flat Water District 4350 Spanish Flat Loop Rd, Napa 94558 | (707) 966-1607 |