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Monthly Water Tracker


As of Feb. 1, 2018

We began calendar year 2018 with groundwater storage well within Stage 1 (Normal) of the District’s Water Shortage Contingency Plan. This year’s precipitation is below 60% of average to-date at the San Jose Index Station and below average for the Santa Cruz Mountains, South County, and the Diablo Range. The snow water equivalent for the Northern Sierra is less than 30% of normal for this date.

Despite below normal local rainfall and well below normal statewide snow pack, end of year groundwater 6storage for 2018 is projected to be well within Stage 1 (Normal).

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Water Tracker Summary: Dec 2017 443.29 KB


Rainfall in San Jose:

  • Month of January = 2.95 inches
  • Rainfall year total = 4.45 inches or 57% of average to date (Rainfall year is July 1 to June 30)
  • February 1 Northern Sierra snowpack was 27% of normal for this date    

Local Reservoirs

  • Total February 1 storage = 44,482 acre-feet
    (Current local reservoir storage)
    • 50% of 20-year average for that date
    • 26% of total capacity
    • 39% of restricted capacity (169,009 acre-feet total storage capacity limited by seismic restrictions to 113,667 acre-feet)
  • Approximately 480 acre-feet imported water was delivered into local reservoirs during January 2018
  • Total estimated releases to streams (local and imported water) during January was 5,000 acre-feet


Groundwater Storage:  Total storage at the end of 2018 is predicted to fall within Stage 1 (Normal) of the district's Water Shortage Contingency Plan


Imported Water

  • As of January 29, 2018, the Statewide Average snowpack water content is 30% of the historic average for this date
  • 2018 State Water Project (SWP) and Central Valley Project (CVP) allocations:
    • 2018 SWP allocation: 20% = 20,000 acre-feet announced on January 29, 2018
    • 2018 South-of-Delta CVP allocations: A 2018 CVP allocation has not yet been announced
  • Initial 2018 SWP allocation:  15% = 15,000 acre-feet announced on November 30, 2017
  • Current Statewide reservoir storage as if Jan. 1, 2018  
    • Shasta Reservoir at 74% of capacity (109% of average for this date)
    • Oroville Reservoir at 40% of capacity (61% of average for this date)
    • San Luis Reservoir at 85% of capacity (108% of average for this date)
  • Current statewide reservoir storage summary (map) (table)
  • District's Semitropic groundwater bank reserves are 254,385 acre-feet as of October 31, 2017
  • Estimated SFPUC deliveries to Santa Clara County
    • Projected month of January = 2,991 acre-feet
    • Five-year annual average is 48,700 acre-feet

Treated Water

  • Below average demands of 5,864 acre-feet delivered in January
  • This total is 97% of the five-year average for the month of January
  • Year-to-date deliveries = 5,864 acre-feet or 97% of the five-year average

Conserved Water

  • Saved 72,000 acre-feet in FY17 from long-term program (baseline year is 1992)
  • Long-term program goal is to save nearly 75,000 acre-feet in FY18
  • The Board has called for a 20% reduction and a limit of three days per week for irrigation of ornamental landscape with potable water
  • Achieved a 21% reduction in water use through the first ten months of  2017, compared to 2013
  • Monthly Water Use Report

Recycled Water

  • Estimated January 2018 production  =  900 acre-feet
  • Estimated year-to-date through January = 900 acre-feet or 84% of the five-year average
  • Silicon Valley Advanced Water Purification Center produced an estimated 1.3 billion gallons (4,100 acre-feet) of purified water in 2017.  Since the beginning of 2018, about 200 acre-feet of purified water has been blended with existing tertiary recycled water for South Bay Water Recycling Program's customers