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Water Tracker

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


As of July 1, 2016

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Santa Clara County residents and businesses reduced water use by 36% in May 2016 compared to May 2013. This brings the cumulative 2016 water savings through May to 29% compared to the same period of 2013.

Realizing parts of the state were better off than others in terms of water supply, on May 18, 2016, the State Water Resources Control Board (State Board) adopted an updated Emergency Regulation that allowed water retailers throughout the state to determine their conservation standard based on local conditions. Wholesale water suppliers, such as the District, were required to calculate how much water they expect they can deliver to each of their water retailers over the three year period. The District has posted the information required pursuant to the State Board Emergency Regulation on its website.

At their June 14 meeting, the District’s Board of Directors lowered its water use reduction target 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 percent 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.




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Rainfall in San Jose:

  • Month of June = 0 inches
  • Rainfall year total = 13.78 inches or 96% of annual average (Rainfall year is July 1 to June 30)



Local Reservoirs

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  • Total July 1 storage = 99,746 acre-feet
    (Click here for current local reservoir storage)
    • 92% 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 6,208 acre-feet of Imported Water delivered into local reservoirs during June 2016
  • Total releases to streams (local and imported water) during June was 8,964 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:

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 June 28, 2016: 
    • Shasta Reservoir at 87% of capacity (107% of average for this date)
    • Oroville Reservoir at 85% of capacity (104% of

      Delta Flows

      (click to enlarge) 

      average for this date)
    • San Luis Reservoir at 19% of capacity (30% of average for this date)
  • Daily reservoir storage summary (map) (table), current
  • District Semitropic groundwater bank reserves: An estimated 185,257 acre-feet as of June 28, 2016
  • Estimated Hetch Hetchy deliveries to Santa Clara County
    • Month of June = 4,170 acre-feet
    • 2016 Total = 19,542 acre-feet
    • Five-year average is 48,700 acre-feet 



Treated water 

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  • Treated Water DeliveredBelow average demands of 10,253 acre-feet delivered in June
  • This total is 86% of the five-year average for June
  • Year-to-date = 38,492 acre-feet or 74% 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 20% reduction and a limit of three days per week for irrigation of ornamental landscape with potable water
  • Achieved a 29% reduction in water use through the first five months of 2016, compared to 2013


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  • Recycled WaterEstimated June 2016 production  =  1,600 acre-feet
  • Estimated year-to-date through June = 6,200 acre-feet or 74% of the five-year average
  • Silicon Valley Advanced Water Purification Center produced an estimated 3.4 billion gallons (10,500 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