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Water Tracker

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


As of June 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 34% in April 2016 compared to April 2013. This brings the cumulative 2016 water savings through April to 27% compared to the same period of 2013.  

On May 18, 2016 the State Water Resources Control Board adopted an updated Emergency Regulation that allows water retailers throughout the state to determine their conservation standard based on local conditions. Wholesale water agencies, such as the District, are required to identify how much water it expects it can deliver to each of its individual water retailers.

Supplies are less constrained as compared to the last few years, and the District is taking advantage of the improved water supply conditions through full utilization of useable recharge capacity in collaboration with regulatory agencies. Calendar year 2016 recharge is currently estimated to be greater than 120% of average.




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Rainfall in San Jose:

  • Month of May = 0.24 inches
  • Total to date = 13.78 inches or 97% of average to date (Rainfall year is July 1 to June 30)
  • June 1, 2016, Northern Sierra snowpack water content is about 32% of average for that date



Local Reservoirs

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  • Total June 1 storage = 99,360 acre-feet
    (Click here for current local reservoir storage)
    • 88% of 20-year average for that date
    • 59% of total capacity
    • 81% of restricted capacity storage
      (169,009 acre-feet total storage capacity limited by seismic restrictions to 122,924 acre-feet)
  • Approximately 1,047 acre-feet of Imported Water delivered into local reservoirs during May 2016
  • Total releases to streams (local and imported water) during May was 9,588 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 May 31, 2016: 
    • Shasta Reservoir at 92% of capacity (107% of average for this date)
    • Oroville Reservoir at 94% of capacity (111% of

      Delta Flows

      (click to enlarge) 

      average for this date)
    • San Luis Reservoir at 34% of capacity (42% of average for this date)
  • Daily reservoir storage summary (map) (table), current
  • District Semitropic groundwater bank reserves: An estimated 181,669 acre-feet as of May 31, 2016
  • Estimated Hetch Hetchy deliveries to Santa Clara County
    • Month of May = 3,469 acre-feet
    • 2016 Total = 15,372 acre-feet, or 32% of the five-year annual average



Treated water 

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  • Treated Water DeliveredBelow average demands of 8,389 acre-feet delivered in May
  • This total is 73% of the five-year average for May
  • Year-to-date = 28,239 acre-feet or 70% 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 27% reduction in water use through the first four months of 2016, compared to 2013


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  • Recycled WaterEstimated May 2016 production  =  980 acre-feet
  • Estimated year-to-date through May = 4,300 acre-feet or 68% of the five-year average
  • Silicon Valley Advanced Water Purification Center produced an estimated 3.3 billion gallons (10,300 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