Hetch Hetchy Regional Water System


Welcome to the San Francisco Regional Water System Data Viewer. This is the BETA version of the Data Viewer.

The San Francisco Public Utilities Commission provides high-quality drinking water to 2.6 million residents and businesses across Southern Alameda, Northern Santa Clara, San Mateo and San Francisco counties. The Regional Water System delivers a reliable supply of water during all seasons and through periods of water surplus and drought, while also providing green hydroelectric and solar power to our municipal departments. The SFPUC Regional Water System is comprised of the Hetch Hetchy Regional Water System and the Local Water System.

The Hetch Hetchy Regional Water System is an efficient, clean public asset which plays a key role in water delivery in the state of California. Hetch Hetchy water originates in the 652-square mile Tuolumne River basin located in and near Yosemite National Park. The Local Water System is comprised of two watershed areas: the 47-square mile watershed located in the Alameda Creek basin, and the 36-square mile watershed area located on the San Francisco Peninsula, which have served water to San Francisco for 150 years.

This RWS Data Viewer is provided for the public to view meteorological and operational data for the Hetch Hetchy Regional and Local Water Systems. The data are raw and have not been subjected to quality control or quality assurance procedures and do not meet the criteria and standards of final data. Raw data may contain errors or be incomplete, and are released as preliminary data to be used only with appropriate caution. Raw data are provided on an "AS IS" basis, without warranty, express or implied, including without limitation any warranties of merchantability or fitness for a particular purpose or warranties as to the identity or ownership of data or information, the quality, accuracy or completeness of data or information, or that the use of such data or information will not infringe any patent, intellectual property or proprietary rights of any party. Thanks to Droughtmath.com for schematic overlay of RWS pipelines.

The brown line in some graphs represents the long-term daily median. See the Summary of data sources for more information.


For questions about this site, please send email to DataViewerHelp@sfwater.org