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Water Tracker

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


As of August 1, 2016

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Santa Clara County residents and businesses reduced water use by 26% in June 2016 compared to June 2013. This brings the cumulative 2016 water savings through June to 29% compared to the same period of 2013. Realizing parts of the state were better off than others in terms of water supply, the State Water Resources Control Board (State Board) adopted an updated Emergency Regulation that allowed water retailers throughout the state to determine their conservation standard based on local conditions.  

At its June 14 meeting, the District’s Board of Directors lowered its water use reduction target for the period extending through January 2017, but emphasized that residents should continue their efforts to conserve in this ongoing drought. The Board also called for local water providers to continue to institute mandatory measures, as needed, to reach the 20 percent target, and called for restrictions on watering schedules to a maximum of three times a week, up from the two day a week schedule most areas of the county have had in place since the spring of 2015. 

Due to low storage in San Luis Reservoir and algae problems in our imported sources, we have had to limit the amount of imported water entering our system. To make up the difference, we are utilizing storage from Coyote, Anderson and Lexington Reservoirs and have temporarily decreased recharge. As a result of the reduced recharge levels, water levels in some of our percolation ponds have fallen noticeably.




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Rainfall in San Jose:

  • Month of July = 0 inches
  • The average daily high temperature for July was 81.6 degrees Fahrenheit.  Temperatures were slightly below normal for the month



Local Reservoirs

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  • Total August 1 storage = 85,471 acre-feet
    (Click here for current local reservoir storage)
    • 85% of 20-year average for that date
    • 51% of total capacity
    • 70% of restricted capacity storage
      (169,009 acre-feet total storage capacity limited by seismic restrictions to 122,924 acre-feet)
  • Approximately 565 acre-feet of Imported Water delivered into local reservoirs during July 2016
  • Total releases to streams (local and imported water) during July was 8,289 acre-feet



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Groundwater Storage:  End of 2016 storage is predicted to fall within Stage 2 (Alert) 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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  • 2016 State Water Project (SWP) and Central Valley Project (CVP) allocations:
    • 2016 SWP allocation: 60% = 60,000 acre-feet
    • 2016 CVP allocations South-of-Delta:  Municipal and Industrial water service contractors:  55% of historic use = 71,500 acre-feet, Agriculture water service contractors:  5% = 1,655 acre feet
  • Reservoir storage (map) (table), as of August 1, 2016: 
    • Shasta Reservoir at 78% of capacity (110% of average for this date)
    • Oroville Reservoir at 66% of capacity (90% of

      Delta Flows

      (click to enlarge) 

      average for this date)
    • San Luis Reservoir at 10% of capacity (20% of average for this date)
  • Daily reservoir storage summary (map) (table), current
  • District Semitropic groundwater bank reserves: An estimated 190,339 acre-feet as of July 1, 2016
  • Estimated Hetch Hetchy deliveries to Santa Clara County
    • Month of July = 4,446 acre-feet
    • 2016 Total = 23,988 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 FY16, two imported water management agreements were executed as of August 1.

Treated water 

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  • Treated Water DeliveredBelow average demands of 11,362 acre-feet delivered in July
  • This total is 89% of the five-year average for July
  • Year-to-date = 49,854 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 63,000 acre-feet in FY15 from long-term program (baseline year is 1992)
  • Long-term program goal is to save nearly 68,000 acre-feet in FY16
  • 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 29% reduction in water use through the first six months of 2016, compared to 2013


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  • Recycled WaterEstimated July 2016 production  =  2,400 acre-feet
  • Estimated year-to-date through July = 10,132 acre-feet or 94% of the five-year average
  • Silicon Valley Advanced Water Purification Center produced an estimated 3.7 billion gallons (11,300 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