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Water Tracker

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


As of March 1, 2017

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Realizing parts of the state were better off than others in terms of water supply, the State Water Resources Control Board, on February 8, 2017, amended its May 2016 Emergency Regulation.  The amended regulation allows retail water suppliers the opportunity to submit or resubmit their water supply reliability assessments (or "stress tests") by March 15, 2017.

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 recommendations that retailers implement mandatory measures.  The Board also called for continued restrictions on watering schedules to a maximum of three times a week.

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 further improve groundwater storage in 2017.




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Rainfall in San Jose:

  • Month of February = 4.72 inches
  • Rainfall year to date = 14.13 inches (Rainfall year is July 1 to June 30)
  • Normal rainfall for the full year = 14.33 inches
  • March 1 Northern Sierra snowpack was 159% of normal for this date      

Local Reservoirs

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  • Total March 1 storage = 159,855 acre-feet
    (Click here for current local reservoir storage)
    • 149% of 20-year average for that date
    • 95% of total capacity
    • 130% of restricted capacity
      (169,009 acre-feet total storage capacity limited by seismic restrictions to 122,924 acre-feet)
  • No imported water was delivered into local reservoirs during February 2017
  • Total estimated releases to streams (local and imported water) during February, excluding spills, was 78,800 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 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 February 28, 2017, the Statewide Average snowpack water content is 186% of the historic average for this date
  • 2017 State Water Project (SWP) and Central Valley Project (CVP) allocations:
    • 2017 SWP allocation: 60% = 60,000 acre-feet announced on January 18, 2017.  See link to Press Release
    • 2017 CVP allocations:  A 2017 CVP allocation for the District has not yet been announced
  • Reservoir storage (map) (table), as of February 28, 2017: 
    • Shasta Reservoir at 85% of capacity (117% of average for this date)
    • Oroville Reservoir at 75% of capacity (108% of

      Delta Flows

      (click to enlarge) 

      average for this date)
    • San Luis Reservoir at 97% of capacity (114% of average for this date)
  • Daily reservoir storage summary (map) (table), current
  • District Semitropic groundwater bank reserves: An estimated 193,892 acre-feet as of February 28, 2017
  • Estimated SFPUC deliveries (graph) to Santa Clara County
    • Month of February = 2,546 acre-feet
    • 2016 Total to Date = 5,929 acre-feet
    • Five-year average is 48,700 acre-feet
  • Board Governance Policy No. EL-5.3.3 includes keeping the Board informed of imported water management activities on an ongoing basis.  In 2017, six imported water management agreements were executed

Treated water 

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  • Treated Water DeliveredBelow average demands of 4,648 acre-feet (estimated) delivered in February
  • This total is 75% of the five-year average for February
  • Year-to-date estimated = 10,353 acre-feet or 77% 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 15% reduction in water use in January 2017, compared to 2013


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  • Recycled WaterEstimated February 2017 production  =  1,000 acre-feet
  • Estimated year-to-date through February = 1,823 acre-feet or 91% of the five-year average
  • Silicon Valley Advanced Water Purification Center produced an estimated 4.4 billion gallons (13,500 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