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Monthly Water Tracker


As of June 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 precipitation is 60% of average to-date at the San Jose Index Station and below average for the Santa Cruz Mountains, South County, and the Diablo Range. The snow water equivalent for the Northern Sierra is 9% of normal for this date.

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

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Water Tracker June 2018.pdf 373.99 KB


  • Rainfall in Santa Clara County
  • Month of May, City of San Jose: 0.0 inches
  • Rainfall year total: 8.5 inches, 60% of average to date (Rainfall year is July 1 to June 30)
  • May 31 Northern Sierra snowpack: 9% of normal for this date    

Local Reservoirs

Current local reservoir storage

  • Total June 1 storage: 79,652 acre-feet

    • 74% of 20-year average for that date
    • 47% of total capacity
    • 70% of restricted capacity (169,009 acre-feet total storage capacity limited by seismic restrictions to 113,667 acre-feet)
  • Approximately 7,800 acre-feet imported water was delivered into local reservoirs during May 2018
  • Total estimated releases to streams (local and imported water) during May was 8,200 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 45%, which provides 112,395 AF to the District
  • State-wide reservoir storage information, as of June 1, 2018:
    • Shasta Reservoir at 87% of capacity (101% of average for this date)
    • Oroville Reservoir at 68% of capacity (81% of average for this date)
    • San Luis Reservoir at 75% of capacity (94% of average for this date)
  • District’s Semitropic groundwater bank reserves are 256,725 acre-feet as of April 30, 2018
  • Estimated SFPUC deliveries to Santa Clara County:
    • Projected month of March = 2,857 acre-feet
    • 2018 Total to Date = 11,595 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, one imported water management agreement was executed as of June 1, 2018

Treated Water

  • Above average demands of 10,358 acre-feet delivered in May
  • This total is 102% of the five-year average for the month of May
  • Year-to-date deliveries = 34,493 acre-feet or 99% 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 four months of 2018, compared to 2013
  • Monthly Water Use Report

Recycled Water

  • Estimated May 2018 production = 1,600 acre-feet
  • Estimated Year-to-Date through May = 4,500 acre-feet or 70% 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 1,600 acre-feet of purified water has been blended with existing tertiary recycled water for South Bay Water Recycling Program’s customers