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We Deliver

Discover exciting data such as how much rainfall we’ve had in the last weeks, how much water we have in storage, and how our customers are using our water, wastewater and power services. The data is in graph form but we’ll explain what each graph means so that you’ll want to return to follow our tracks!

Chart of Precipitation at Hetchy

A new water year (WY) starts every October. The graph charts cumulative precipitation at Hetch Hetchy Reservoir as the WY progresses. Precipitation is shown as a percentage of average, and curves for the current year and past year are shown. Cumulative precipitation curves for both dry and wet years are also shown, as well as a median. Why 1977? – It is the driest year on record. Why 1983? – It is the wettest year on record.

Reservoir Storage levels

An acre foot is the volume of one acre of surface area (150 by 290 feet, 10 feet shorter than a football field) to a depth of one foot, also equal to approximately 325,851 gallons. On average, 1 acre foot of water is enough to meet the demands of 4 people for a year.

“Up country” storage includes Hetch Hetchy, Cherry (Lloyd) and Eleanor reservoirs. “Local storage” includes Crystal Springs, Calaveras, San Antonio, San Andreas, and Pilarcitos Reservoirs.

Total Deliveries

We provide water to 2.6 million residents in the greater Bay Area. "San Francisco Customers" include water metered at the San Francisco County Line which serves customers in the City and County of San Francisco. Our total service area includes wholesale customers in the Peninsula, South Bay and East Bay communities. Fun fact: The USGS says that a swimming pool holding 1M gallons of water would be 267 feet long, 50 feet wide and 10 feet deep. CY=calendar year

Solar PV Generation

Solar Photovoltaic (PV) technology uses semiconductors to convert solar radiation into DC Electricity. Cogeneration is the process of capturing and using the by-products of electrical generation or wastewater treatment facilities. In the case of wastewater treatment facilities, cogeneration systems use the anaerobic digester gas to generate electricity. Rather than directly releasing these by-products back into the environment, they can be used to generate electricity for the facility. MW=megawatts

PV installations include: Sunset Reservoir, San Francisco International Airport, City Distribution Division Offices, Moscone Convention Center, North Point Treatment Plant, Maxine Hall Neighborhood Medical Center, Southeast Water Pollution Control Plant (SEP), Chinatown Public Library, and Pier 96.


Municipal load is the amount of energy needed to power our municipal facilities. On average that is about 120 MW. These facilities include the San Francisco Municipal Railway, SF General Hospital, SF Unified School District, SFO, SFPD, SFFD, the Port of SF and the SFPUC’s regional and local water and wastewater systems. Hydropower is produced at Kirkwood, Moccasin and Holm powerhouses.

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Last updated: 4/20/2017 10:57:10 AM