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Water Tracker

A monthly assessment of trends in water supply
and use for Santa Clara County, California


As of January 1, 2017

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Santa Clara County residents and businesses reduced water use by 32% in November 2016 compared to November 2013. This brings the cumulative 2016 water savings through November to 28% compared to the same period of 2013. Realizing parts of the state were better off than others in terms of water supply, the State Water Resources Control Board adopted an updated Emergency Regulation in May that allowed water retailers throughout the state to determine their individual conservation standards based on local conditions.

At its June 14 meeting, the District’s Board of Directors (Board) lowered its water use reduction target to 20% for the period extending through January 2017, but emphasized that residents should continue their efforts to conserve in this ongoing drought. The Board also called for local water providers to continue to institute mandatory measures, as needed, to reach the 20% target, and called for restrictions on watering schedules to a maximum of three times a week, up from the two day a week schedule most areas of the county have had in place since the spring of 2015.

Groundwater recharge in 2016 was greater than in normal years and preliminary water supply analysis shows that 2017 recharge should meet or exceed normal year recharge.




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Rainfall in San Jose:

  • Month of December = 1.49 inches
  • Rainfall year total = 4.13 inches or 80% of average to date (Rainfall year is July 1 to June 30)
  • January 3 Northern Sierra snowpack was 68% of normal for this date      

Local Reservoirs

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  • Total January 1 storage = 74,498 acre-feet
    (Click here for current local reservoir storage)
    • 95% of 20-year average for that date
    • 44% of total capacity
    • 61% of restricted capacity
      (169,009 acre-feet total storage capacity limited by seismic restrictions to 122,924 acre-feet)
  • Approximately 254 acre-feet of imported water delivered into local reservoirs during December 2016
  • Total estimated releases to streams (local and imported water) during December was 7,320 acre-feet



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Groundwater Storage:  Estimated end of 2016 storage was within the lower range of Stage 1 (Normal) of the Water Shortage Contingency Plan:

Groundwater Table

Santa Clara Plain
Santa Clara Plain

Coyote Valley
Coyote Valley

Llagas Subbasin
Llagas Subbasin

(click to enlarge)


Imported water

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  • 2017 State Water Project (SWP) and Central Valley Project (CVP) allocations:
    • 2017 SWP allocation: 45% = 45,000 acre-feet announced on December 21, 2016.  See link to Press Release
    • 2017 CVP allocations:  A 2017 CVP allocation has not yet been identified
  • Reservoir storage (map) (table), as of January 3, 2017: 
    • Shasta Reservoir at 73% of capacity (118% of average for this date)
    • Oroville Reservoir at 56% of capacity (91% of

      Delta Flows

      (click to enlarge) 

      average for this date)
    • San Luis Reservoir at 62% of capacity (90% of average for this date)
  • Daily reservoir storage summary (map) (table), current
  • District Semitropic groundwater bank reserves: An estimated 190,339 acre-feet as of January 3, 2017
  • Estimated SFPUC deliveries (graph) to Santa Clara County
    • Month of December = 2,787 acre-feet
    • 2016 Total to Date = 43,509 acre-feet
    • Five-year average is 48,700 acre-feet

Treated water 

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  • Treated Water DeliveredBelow average demands of 5,990 acre-feet (estimated) delivered in December
  • This total is 93% of the five-year average for December
  • Year-to-date estimated = 97,654 acre-feet or 85% of the five-year average



Conserved water


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  • /uploadedImages/Services/CleanReliableWater/WaterSupplyPlanning/WaterTracker_documents_and_images/1-Final_Docs_and_Images/11.Aug_2013_Total-Water-Use.jpgSaved 69,000 acre-feet in FY16 from long-term program (baseline year is 1992)
  • Long-term program goal is to save nearly 72,000 acre-feet in FY17
  • 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 28% reduction in water use through the first 11 months of 2016, compared to 2013


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  • Recycled WaterEstimated December 2016 production  =  700 acre-feet
  • Estimated 2016 through December = 18,870 acre-feet or 99% of the five-year average
  • Silicon Valley Advanced Water Purification Center produced an estimated 4.3 billion gallons (13,200 acre-feet) of advanced purified recycled water since March 25, 2014.  The purified water is blended with existing tertiary recycled water for South Bay Water Recycling Program's customer