Water Supply
A quick look at the supplies, demand and challenges of Napa County's water.
Local Supplies for Cities
- Napa - Lake Hennessey (31,000 AF - acre feet) and Milliken Reservoir (1,400 AF)
- Yountville - Rector Reservoir (4,500 AF) and Well
- St. Helena - Bell Canyon Reservoir (2,350 AF)
- Calistoga - Kimball Reservoir (275 AF)
- Other municipal supplies include, imported water (State Water Project), groundwater, and recycled wastewater
State Water Project (SWP) Supplies
- Napa County FCWCD has 29,025 AF of SWP entitlement
- Napa County FCWCD subcontracts with the Cities of American Canyon, Napa and Calistoga
- Allocations vary annually
- Delta issues are raising concerns about reliability
Local Municipal Demands
- American Canyon - 4,000 AF
- Napa - 15,500 AF
- Yountville - 600 AF
- St. Helena - 2,000 AF
- Calistoga - 820 AF
- TOTAL - about 23,000 AF
County Unincorporated Area Water Supplies
- Groundwater Primarily
- Some Surface Water (diversion/storage)
- Limited Lake Berryessa Use
- Some areas receive water and recycled water from municipalities
County Unincorporated Area Water Use Estimates (Napa 2050 Study)
- Agricultural Demands - 32,000 AF
- Winery Demands - 1,300 AF
- Rural Residential Demands - 3,500 AF
- Improved Open Space - 2,800 AF
- Total - 39,600 AF, met by groundwater (31,700 AF), surface water (7,000 AF), and recycled water (900 AF)
Regional Water Supply Activities
- North Bay Aqueduct Alternative Intake Studies
- Participation in Delta Habitat Conservation and Conveyance Program
- County Comprehensive Groundwater Monitoring Program Development
- North Bay Water Reuse Authority Program (water recycling)
- Water Conservation Programs
Future Challenges
- Increased competition for available supplies
- Preservation of imported water supplies and related costs
- Preservation of groundwater supplies locally
- Challenges during drought conditions
- Global Warming/Climate Change
Above provided by Felix Riesenberg, Deputy Director of Public Works - Flood Control & Water Resources, Napa County