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Water Tracker

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


As of April 1, 2017

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January and February storms generated extraordinarily large flows in local creeks, and District reservoirs are currently at 125% 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.

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 allowed retail water suppliers the opportunity to submit or resubmit their water supply reliability assessments (or "stress tests") by March 15, 2017.

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 March = 1.38 inches
  • Rainfall year to date = 15.55 inches (Rainfall year is July 1 to June 30)
  • Normal rainfall for the full year = 14.33 inches
  • April 3 Northern Sierra snowpack was 147% of normal for this date      

Local Reservoirs

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  • Total April 1 storage = 144,068 acre-feet
    (Click here for current local reservoir storage)
    • 125% of 20-year average for that date
    • 85% of total capacity
    • 117% 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 March 2017
  • Total estimated releases to streams (local and imported water) during March was 46,260 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 March 30, 2017, the Statewide Average snowpack water content is 164% 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 South-of-Delta CVP allocations announced on March 22, 2017.  See link to Press Release
      • M&I water service allocation:  90%, District's M&I allocation is 97,500 AF
      • Agricultural water service allocation:  65%, or 21,515 AF
  • Reservoir storage (map) (table), as of March 30, 2017: 
    • Shasta Reservoir at 88% of capacity (109% of average for this date)
    • Oroville Reservoir at 75% of capacity (99% of

      Delta Flows

      (click to enlarge) 

      average for this date)
    • San Luis Reservoir at 99% of capacity (109% of average for this date)
  • Daily reservoir storage summary (map) (table), current
  • District's Semitropic groundwater bank reserves: An estimated 198,129 acre-feet as of March 30, 2017
  • Estimated SFPUC deliveries (graph) to Santa Clara County
    • Month of March = 2,669 acre-feet
    • 2017 Total to Date = 8,598 acre-feet
    • Five-year annual average is 48,700 acre-feet

Treated water 

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  • Treated Water DeliveredBelow average demands of 5,766 acre-feet delivered in March
  • This total is 81% of the five-year average for March
  • Year-to-date = 16,560 acre-feet or 80% 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 21% reduction in water use through the first two months of  2017, compared to 2013


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  • Recycled WaterEstimated March 2017 production  =  700 acre-feet
  • Estimated year-to-date through March = 2,138 acre-feet or 67% 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 400 acre-feet of purified water has been blended with existing tertiary recycled water for South Bay Water Recycling Program's customers