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Water Tracker

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


As of October 1, 2017

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On June 13, 2017, the Board of Directors approved a resolution calling for the community to voluntarily reduce their water use 20 percent and continued certain water waste prohibitions. The resolution also recommended that all municipalities consider adopting a permanent three day per week watering restriction and resulted in a 10 percent reduction to treated contract deliveries.

Groundwater recharge in 2016 was far greater than in normal years. Preliminary water supply analysis shows that 2017 District recharge, together with natural recharge, will sustain or further improve groundwater storage in 2017.

Due to improved conditions, the District is replenishing storage in the Semitropic Water Bank that was utilized during the recent drought. So far this year the District has stored over 50,000 acre-feet of imported supplies in the Semitropic Water Bank and plans to add an additional 15,000 acre-feet by the end of the year.




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Rainfall in San Jose:

  • Month of September = 0 inches
  • The average daily high temperature for September was 85.2 degrees Fahrenheit.  Temperatures were above normal for the month     

Local Reservoirs

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  • Total October 1 storage = 77,025 acre-feet
    (Click here for current local reservoir storage)
    • 91% of 20-year average for that date
    • 46% of total capacity
    • 68% of restricted capacity
      (169,009 acre-feet total storage capacity limited by seismic restrictions to 113,667 acre-feet)
  • Approximately 1,000 acre-feet imported water was delivered into local reservoirs during September 2017
  • Total estimated releases to streams (local and imported water) during September was 9,250 acre-feet



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Groundwater Storage:  Total storage at the end of 2017 is predicted to fall within Stage 1 (Normal) of the District's 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: 85% announced on April 14, 2017, provides 85,000 acre-feet.  See link to Press Release
    • 2017 South-of-Delta CVP allocations announced on April 11, 2017.  See link to Press Release
      • M&I water service allocation:  100%, District's M&I allocation is 119,400 AF
      • Agricultural water service allocation:  100%, or 33,100 AF
  • Reservoir storage (map) (table), as of October 1, 2017: 
    • Shasta Reservoir at 74% of capacity (124% of average for this date)
    • Oroville Reservoir at 37% of capacity (60% of

      Delta Flows

      (click to enlarge) 

      average for this date)
    • San Luis Reservoir at 86% of capacity (183% of average for this date)
  • Daily reservoir storage summary (map) (table), current
  • District's Semitropic groundwater bank reserves are 232,245 acre-feet as of August 31, 2017
  • Estimated SFPUC deliveries (graph) to Santa Clara County
    • Month of September = 4,556 acre-feet
    • 2017 Total to Date = 31,293 acre-feet
    • Five-year annual average is 48,700 acre-feet

Treated water 

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  • Treated Water DeliveredBelow average demands of 11,377 acre-feet delivered in September
  • This total is 98% of the five-year average for September
  • Year-to-date deliveries = 80,871 acre-feet or 94% 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 23% reduction in water use through the first eight months of  2017, compared to 2013


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  • Recycled WaterEstimated September 2017 production  =  1,800 acre-feet
  • Estimated year-to-date through September = 13,200 acre-feet or 84% of the five-year average
  • Silicon Valley Advanced Water Purification Center produced an estimated 1.3 billion gallons (3,900 acre-feet) of purified water in 2016.  Since the beginning of 2017, about 3,400 acre-feet of purified water has been blended with existing tertiary recycled water for South Bay Water Recycling Program's customers