Monthly Water Tracker | Santa Clara Valley Water
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Monthly Water Tracker


As of October 1, 2018

We began calendar year 2018 with groundwater storage well within Stage 1 (Normal) of the District’s Water Shortage Contingency Plan. This year’s (beginning September 1, 2017) precipitation was 60% of average at the San Jose Index Station and well below average for the Santa Cruz Mountains, South County, and the Diablo Range. The snow water equivalent for the Northern Sierra was considerably below normal.

Despite below normal local rainfall and below normal statewide snow pack, end of year groundwater storage for 2018 is projected to be relatively high, well within Stage 1 (Normal) due to carryover supplies from a wet 2017.

Related Files
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Water Tracker October 2018.pdf 370.99 KB


  • Rainfall in Santa Clara County
  • Month of September, City of San Jose: 0.0 inches
  • The average daily high temperature for September was 79.6 degrees Fahrenheit. Temperatures were below normal for the month

Local Reservoirs

Current local reservoir storage

  • Total October 1 storage: 55,399 acre-feet

    • 68% of 20-year average for that date
    • 33% of total capacity
    • 49% of restricted capacity (166,808 acre-feet total storage capacity limited by seismic restrictions to 111,963 acre-feet)
  • Approximately 420 acre-feet imported water was delivered into local reservoirs during September 2018
  • Total estimated releases to streams (local and imported water) during September was 5,800 acre-feet


Groundwater Storage:  Total storage at the end of 2018 is predicted to fall within Stage 1 (Normal) of the district's Water Shortage Contingency Plan

Table of groundwater sub-basin levels for the month

Imported Water

  • 2018 State Water Project (SWP) and Central Valley Project (CVP) allocations:
    • 2018 SWP allocation of 35%, providing 35,000 AF to the District
    • 2018 South-of-Delta CVP allocations:
      • The M&I allocation is currently 75% and the Agricultural allocation is 50%, which provides 114,050 AF to the District
  • State-wide reservoir storage information, as of October 1, 2018:
    • Shasta Reservoir at 53% of capacity (88% of average for this date)
    • Oroville Reservoir at 39% of capacity (62% of average for this date)
    • San Luis Reservoir at 55% of capacity (117% of average for this date)
  • District’s Semitropic groundwater bank reserves are at 79% of capacity, or 277,364 acre-feet as of August 31, 2018
  • Estimated SFPUC deliveries to Santa Clara County:
    • Projected month of August = 4,805 acre-feet
    • 2018 Total to Date = 29,288 acre-feet
    • Five-year annual 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 FY 2018, three imported water management agreements were executed as of August 31, 2018

Treated Water

  • Above average demands of 11,480 acre-feet delivered in September
  • This total is 104% of the five-year average for the month of September
  • Year-to-date deliveries = 83,691 acre-feet or 104% of the five-year average

Conserved Water

  • Saved 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 21% reduction in water use through the first eight months of 2018, compared to 2013
  • Monthly Water Use Report

Recycled Water

  • Estimated September 2018 production = 1,900 acre-feet
  • Estimated Year-to-Date through September = 15,900 acre-feet or 101% of the five-year average
  • Silicon Valley Advanced Water Purification Center produced an estimated 1.3 billion gallons (4,000 acre-feet) of purified water in 2017. Since the beginning of 2018, about 3,000 acre-feet of purified water has been blended with existing tertiary recycled water for South Bay Water Recycling Program’s customers