Jamison Canyon water treatment plant (City of Napa)

Water Supply

A quick look at the supplies, demand and challenges of Napa County's water.

Local Supplies for CitiesLake Hennessey Water Intake

  • 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 DemandsBarker Slough Pumping Plant

  • 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)

North Bay Aqueduct

 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