The drinking water we provide to 2.7 million customers in four Bay Area counties comes from a variety of protected and carefully managed sources. Although the largest percentage of our water comes from snowmelt in the Sierra Nevada, an important part of our water supply comes from rainfall collecting in East Bay and Peninsula reservoirs and filtering into the groundwater aquifer. We serve an ever-changing blend of these different sources to our customers.
By relying on multiple sources of water supply, we help protect our customers from potential disruptions in water supply from emergencies or natural disasters. A diverse mix of water sources also helps us be more resilient to long-term water vulnerabilities such as global climate change, regulatory changes that reduce the amount of water we can use from creeks and rivers, and population growth.
We own and operate the Hetch Hetchy Regional Water System, which serves 2.7 million customers in San Francisco and wholesale through 26 Water agencies in Alameda, Santa Clara, and San Mateo counties.
We are dedicated to protecting and sustaining the resources entrusted to our care. Learn more about our regional watersheds including Alameda, Peninsula, and Upper Tuolumne.
Our water supply includes local groundwater, also known as well water. Learn more about our sourcing, storage, and treatment process.
We work to conserve our precious drinking water supply by reusing water safely in many programs including irrigation.
We offer design tips and grants to encourage new building construction and retail water users to utilize rainwater and greywater for irrigation, toilet flushing, and more.