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Water Tracker

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


As of November 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 55,000 acre-feet of imported supplies in the Semitropic Water Bank and plans to add an additional 10,000 acre-feet by the end of the year.




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Rainfall in San Jose:

  • Month of October = 0.12 inches
  • Rainfall year total = 0.12 inches or 12% of average to date (Rainfall year is July 1 to June 30)
  • The average daily high temperature for October was 79.5 degrees Fahrenheit.  Temperatures were above normal for the month     

Local Reservoirs

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  • Total November 1 storage = 60,779 acre-feet
    (Click here for current local reservoir storage)
    • 79% of 20-year average for that date
    • 36% of total capacity
    • 53% of restricted capacity
      (169,009 acre-feet total storage capacity limited by seismic restrictions to 113,667 acre-feet)
  • Approximately 100 acre-feet imported water was delivered into local reservoirs during October 2017
  • Total estimated releases to streams (local and imported water) during October was 9,900 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 31, 2017: 
    • Shasta Reservoir at 70% of capacity (119% of average for this date)
    • Oroville Reservoir at 35% of capacity (57% of

      Delta Flows

      (click to enlarge) 

      average for this date)
    • San Luis Reservoir at 74% of capacity (140% of average for this date)
  • Daily reservoir storage summary (map) (table), current
  • District's Semitropic groundwater bank reserves are 239,431 acre-feet as of September 30, 2017
  • Estimated SFPUC deliveries (graph) to Santa Clara County
    • Month of October = 4,329 acre-feet
    • 2017 Total to Date = 36,275 acre-feet
    • Five-year annual average is 48,700 acre-feet

Treated water 

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  • Treated Water DeliveredAbove average demands of 10,266 acre-feet delivered in October
  • This total is 103% of the five-year average for October
  • Year-to-date deliveries = 91,137 acre-feet or 95% 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 72,000 acre-feet in FY17 from long-term program (baseline year is 1992)
  • Long-term program goal is to save nearly 75,000 acre-feet in FY18
  • 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 22% reduction in water use through the first nine months of  2017, compared to 2013


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  • Recycled WaterEstimated October 2017 production  =  1,600 acre-feet
  • Estimated year-to-date through October = 14,900 acre-feet or 85% 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 3,700 acre-feet of purified water has been blended with existing tertiary recycled water for South Bay Water Recycling Program's customers