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Water Tracker

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


As of May 1, 2016

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The District’s Board of Directors’ current call for 30% water use reduction and twice weekly landscape watering extends until June 30. Santa Clara County residents and businesses reduced water use by 30% in March 2016 compared to March 2013. This brings the cumulative 2016 water savings through March to 23% compared to the same period of 2013.  

Local reservoir storage is at 91% of the 20-year average for this time of year and 86% of restricted storage capacity and storage in key northern California reservoirs is above normal for this time of year. Supplies are less constrained as compared to the last few years, and the District is taking advantage of the improved water supply conditions by increasing recharge operations in collaboration with regulatory agencies.




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Rainfall in San Jose:

  • Month of April = 1.49 inches
  • Total to date = 13.50 inches or 98% of average to date (Rainfall year is July 1 to June 30)
  • May 1, 2016, Northern Sierra snowpack water content is about 63% of average for that date



Local Reservoirs

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  • Total May 1 storage = 105,387 acre-feet
    (Click here for current local reservoir storage)
    • 91% of 20-year average for that date
    • 62% of total capacity
    • 86% of restricted capacity storage
      (169,009 acre-feet total storage capacity limited by seismic restrictions to 122,924 acre-feet)
  • Approximately 406 acre-feet of Imported Water delivered into local reservoirs during April 2016
  • Total releases to streams (local and imported water) during April was 9,983 acre-feet



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Groundwater Storage:  End of 2016 storage is predicted to fall within Stage 2 (Alert) of the Water Shortage Contingency Plan if the remainder of 2016 is dry:

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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  • 2016 State Water Project (SWP) and Central Valley Project (CVP) allocations:
    • 2016 SWP allocation: 60% = 60,000 acre-feet
    • 2016 CVP allocations South-of-Delta:  Municipal and Industrial water service contractors:  55% of historic use = 71,500 acre-feet, Agriculture water service contractors:  5% = 1,655 acre feet
  • Reservoir storage (map) (table), as of April 29, 2016: 
    • Shasta Reservoir at 93% of capacity (108% of average for this date)
    • Oroville Reservoir at 96% of capacity (118% of

      Delta Flows

      (click to enlarge) 

      average for this date)
    • San Luis Reservoir at 48% of capacity (53% of average for this date)
  • Daily reservoir storage summary (map) (table), current
  • District Semitropic groundwater bank reserves: An estimated 180,500 acre-feet as of April 29, 2016
  • Estimated Hetch Hetchy deliveries to Santa Clara County
    • Month of April = 3,126 acre-feet
    • 2016 Total = 11,903 acre-feet, or 25% of the five-year annual average



Treated water 

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  • Treated Water DeliveredBelow average demands of 5,048 acre-feet (estimated) delivered in April
  • This total is 61% of the five-year average for April
  • Year-to-date = 19,850 acre-feet or 69% 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 63,000 acre-feet in FY15 from long-term program (baseline year is 1992)
  • Long-term program goal is to save nearly 68,000 acre-feet in FY16
  • The Board has called for a 30% reduction and a limit of two days per week for irrigation of ornamental landscape with potable water
  • Achieved a 23% reduction in water use through the first three months of 2016, compared to 2013


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  • Recycled WaterEstimated April 2016 production  =  1,566 acre-feet
  • Estimated year-to-date through April = 4,500 acre-feet or 100% of the five-year average
  • Silicon Valley Advanced Water Purification Center produced an estimated 3.3 billion gallons (10,100 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