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Water Tracker

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


As of September 1, 2015

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Santa Clara County residents and businesses continued the upward trend in water savings in July, achieving a cumulative 25% reduction in water use through the first seven months of 2015 compared to 2013. The community is encouraged to continue the good work in reducing water use in order to meet the District Board of Directors target of 30%. Please remember that most areas in the county have a restriction on irrigating ornamental landscape with potable water to two days a week. 

The rainfall year that ended on June 30 was another below-average year in the county and imported supplies continue to be limited.

The District continues to recharge the groundwater aquifers in 2015 using the available, limited quantities of surface and imported waters. There has been some improvement in groundwater storage in the north county compared to last year. However, total groundwater storage is predicted to remain in the Severe Stage through the end of 2015 if cumulative water use reduction for the rest of the year continues to remain below 30%.




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Rainfall in San Jose:

  • Month of August = 0.0 inches
  • The average daily high temperature for August was 81.7 degrees Fahrenheit.  Temperatures were slightly above normal for the month



Local Reservoirs

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  • Total September 1 storage = 67,511 acre-feet
    (Click here for current local reservoir storage)
    • 71% of 20-year average for that date
    • 40% of total capacity
    • 55% of restricted capacity storage
      (169,009 acre-feet total storage capacity limited by seismic restrictions to 122,924 acre-feet)
  • Approximately 117 acre-feet of Imported Water delivered into local reservoirs during August 2015
  • Total releases to streams (local and imported water) during August = 5,448 acre-feet



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Groundwater storage:  End of 2015 storage is predicted to fall within Stage 3 (Severe) 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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  • 2015 State Water Project (SWP) and Central Valley Project (CVP) allocations:
    • 2015 SWP allocation: 20% = 20,000 acre-feet
    • 2015 CVP allocations: Municipal and Industrial users South-of-Delta will receive enough water to meet health and safety needs or 25% of historic use, whichever is greater, 0% for Irrigation. A total of 40,300 acre-feet is anticipated to be delivered
  • Reservoir storage (map) (table), as of September 1, 2015: 
    • Shasta Reservoir at 40% of capacity (62% of average for this date)
    • Oroville Reservoir at 31% of capacity (46% of

      Delta Flows

      (click to enlarge) 

      average for this date)
    • San Luis Reservoir at 19% of capacity (45% of average for this date)
  • Daily reservoir storage summary (map) (table), current
  • District Semitropic groundwater bank reserves: An estimated 210,400 acre-feet as of September 1, 2015. District is pursuing maximum allowable withdrawals in 2015
  • Estimated Hetch Hetchy deliveries to Santa Clara County
    • Month of August = 4,756 acre-feet
    • Year-to-date = 32,621 acre-feet, or 100% of the five-year average



Treated water 

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  • Treated Water DeliveredBelow average demands of 11,100 acre-feet delivered in August
  • This total is 83% of the five-year average for August
  • Estimated year-to-date = 65,445 acre-feet or 83% 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 59,300 acre-feet in FY14 from long-term program (baseline year is 1992)
  • Long-term program goal is to save nearly 63,000 acre-feet in FY15
  • 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 25% reduction in water use through the first seven months of 2015 compared to 2013


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  • Recycled WaterEstimated August 2015 production  =  2,300 acre-feet
  • Estimated year-to-date through August = 14,000 acre-feet or 118% of the five-year average
  • Silicon Valley Advanced Water Purification Center produced an estimated 2,631 million gallons (8,075 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