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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, 2017

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January and February storms generated extraordinarily large flows in local creeks, and District reservoirs are currently at 98% of average for this date.

On January 31, 2017, the Board of Directors (Board) approved a resolution calling for 20 percent reduction and continued certain water waste prohibitions, but removed the recommendation that retailers implement mandatory measures. The Board also called for continued restrictions on watering schedules to a maximum of three times a week.

On April 7, 2017, the Governor issued an Executive Order (EO) ending the drought state of emergency for a majority of the state. In response to the EO, the State Board rescinded their mandatory conservation and stress test requirements, however they are continuing with the water use prohibitions and monthly reporting for urban water retailers.

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.




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Rainfall in San Jose:

  • Month of May = 0 inches
  • Rainfall year to date = 17.17 inches (Rainfall year is July 1 to June 30)
  • Normal rainfall for the full year = 14.33 inches
  • June 2 Northern Sierra snowpack was 185% of normal for this date      

Local Reservoirs

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  • Total June 1 storage = 109,358 acre-feet
    (Click here for current local reservoir storage)
    • 98% of 20-year average for that date
    • 65% of total capacity
    • 96% of restricted capacity
      (169,009 acre-feet total storage capacity limited by seismic restrictions to 113,667 acre-feet)
  • Approximately 490 acre-feet imported water was delivered into local reservoirs during May 2017
  • Total estimated releases to streams (local and imported water) during May was 12,980 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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  • As of June 1, 2017, the Statewide Average snowpack water content is 192% of the historic average for this date
  • 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 June 1, 2017: 
    • Shasta Reservoir at 96% of capacity (112% of average for this date)
    • Oroville Reservoir at 70% of capacity (82% of

      Delta Flows

      (click to enlarge) 

      average for this date)
    • San Luis Reservoir at 94% of capacity (118% of average for this date)
  • Daily reservoir storage summary (map) (table), current
  • District's Semitropic groundwater bank reserves: An estimated 196,697 acre-feet as of June 1, 2017
  • Estimated SFPUC deliveries (graph) to Santa Clara County
    • Month of May = 3,450 acre-feet
    • 2017 Total to Date = 13,864 acre-feet
    • Five-year annual average is 48,700 acre-feet

Treated water 

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  • Treated Water DeliveredBelow average demands of 10,475 acre-feet delivered in May
  • This total is 97% of the five-year average for May
  • Year-to-date = 34,102 acre-feet or 89% 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 28% reduction in water use through the first four months of  2017, compared to 2013


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  • Recycled WaterEstimated May 2017 production  =  1,500 acre-feet
  • Estimated year-to-date through May = 4,800 acre-feet or 73% 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 900 acre-feet of purified water has been blended with existing tertiary recycled water for South Bay Water Recycling Program's customers