September 25, 2026 - Blend Change Notice:
Please be advised that there will be a temporary source water blend change on September 25, 2026. 

The Harry Tracy Water Treatment Plant (HTWTP) went offline on September 24 for maintenance and will return to service in mid-November.  At that time, the Sunol Valley Water Treatment Plant (SVWTP) will begin treating supply.

Typically, we receive our water from the HTWTP located in San Bruno, which is owned by San Francisco Public Utilities Commission (SFPUC). The plant treats and delivers water stored in Crystal Springs and San Andreas reservoirs to customers throughout the Northern Peninsula.  On September 25, we will be receiving water mostly from the Hetch Hetchy Aqueduct with some flow also coming from SVWTP.

We are monitoring these conditions and will provide updates should significant changes occur. Be assured that in spite of occasional variations in taste or odor, your water meets the highest standards for drinking water. Please call the North Coast County Water District at 650-355-3462 for more information about your water quality or send an email to info@nccwd.com if you have additional questions.

 

North Coast County Water District provides high quality drinking water to the residents of Pacifica. The San Francisco Public Utilities Commission supplies the water to NCCWD from isolated watersheds in Yosemite National Park and from protected local watersheds. From the source, through treatment and distribution, and finally to the tap, the quality is maintained and protected every step of the way.

The California Department of Public Health and the United States Environmental Protection Agency set standards for drinking water quality. To ensure that the water delivered to NCCWD and other customers consistently meets these standards, San Francisco monitors the water at the source and at the treatment plant for a variety of constituents including turbidity (clarity), organic and inorganic chemicals, microbiological quality, mineral content, and radiological quality.

NCCWD monitors the water supply as it enters the system from San Francisco for turbidity and adequate chlorine residual concentration. To ensure that the water remains safe, NCCWD collects numerous samples each week from various locations in the distribution system to be analyzed for coliform bacteria, chlorine residual, pH, turbidity, and temperature. NCCWD employs a trained and experienced analyst who performs these tests at the District's State-certified laboratory.

Every three months, NCCWD monitors the distribution system for trihalomethanes, or THMs, compounds formed when the chlorine used for disinfection reacts with naturally occurring organic compounds found in the source water. This monitoring indicates that THMs in the water are consistently at safe levels throughout the year.

The bottom line: North Coast County Water District consistently provides to consumers high quality drinking water that is safe to drink and meets all standards set by the California Department of Public Health and the United States Environmental Protection Agency.