The City's wells supply over 2 million gallons daily. Historically, approximately half of the City’s total water supply is derived from purchased surface water from the San Francisco Public Utility Commission (SFPUC) and the groundwater that is produced from the City’s wells.
The SFPUC is in the process of completing a roughly $5 billion capital program of seismic upgrades and reliability enhancements to its aging Hetch-Hetchy regional water system that provides water supply to many Bay Area communities. To help fund these improvements and ensure adequate revenue recovery over a period of declining water sales, the SFPUC has substantially increased it wholesale water rates since 2010. After 2016, the SFPUC was temporarily able to defer wholesale rate increases due to an overcollection of revenues that resulted in a buildup of fund reserves in a Balancing Account that has been drawn down over the past 5 years. The Balancing Account is now mostly depleted and the SFPUC began resuming annual wholesale rate increases with a 16% increase effective July 1, 2022 and additional rate increases projected in future years. The following chart shows historical and projected SFPUC wholesale water rates.