Our drinking water supply consists of surface water and groundwater that are well protected and carefully managed. All of the drinking water delivered by the North Coast County Water District (NCCWD) during 2025 was purchased from the San Francisco Public Utilities Commission (SFPUC). SFPUC provides 2.7 million customers in cities and towns across the region through its San Francisco Regional Water System (SFRWS) with water so high quality that it meets all federal and state standards. The major water source for the SFPUC is in Yosemite National Park and originates from spring snowmelt flowing down the Tuolumne River to storage in the Hetch Hetchy Reservoir. Nearly all of the supply obtained by NCCWD comes from Crystal Springs and San Andreas Reservoirs. All the water stored in the local reservoirs is filtered and disinfected at the Harry Tracy Water Treatment Plant, located in San Bruno, prior to delivery to NCCWD.

Read more about our water source and review the annual water quality report on the CCR page.

Visit the San Francisco Public Utilites Commission website for additional information on water supply and treatment.