The Coastside County Water District was formed in 1947 by a vote of the people within the Coastside community. Two years after it was formed, the District acquired the facilities of Citizens Utilities Company and supplied water to 487 existing water connections. The District’s office was originally located in the Half Moon Bay Mercantile Building and moved its headquarters to 766 Main Street in 1953. A new administrative building was constructed in 1971 to serve the District’s 2,325 customers.
Since its formation, the District accomplished many milestones to better serve the Coastside community. The Denniston Project was completed in 1972 with the construction of the Denniston Water Treatment Plant. The Nunes Water Treatment Plant was completed in 1982 with a major expansion in 1992. The completion of the Crystal Springs Water Supply Project in 1994 gave the District direct access to Upper Crystal Springs Reservoir.
In 2008, the District completed the El Granada Transmission Pipeline Replacement Project. This project replaced welded steel pipe with ductile iron pipe spanning from El Granada to Half Moon Bay. The District replaced a welded steel pipeline across Pilarcitos Creek in 2016 to provide more reliable water service for downtown Half Moon Bay. The District successfully completed a major renovation of the Denniston Water Treatment Plant in 2013 and constructed the Denniston Treated Water Booster Pump Station and the Bridgeport Transmission Pipeline in 2017. The District installed advanced metering infrastructure in 2018 to allow all meters to be read remotely which coincided with providing a customer web portal enabling timely water use notifications for customers and increased engagement with customers.
The District currently has 7,700 water connections, 2 water treatment plants, 10 treated water storage tanks, and 100 miles of distribution and transmission pipeline. The District serves the City of Half Moon Bay and the unincorporated communities of Moonridge, Miramar, El Granada, and Princeton. Serving a population of approximately 19,000, the District’s facilities are valued at $400 million and are operated by 21 full-time employees.
The District works diligently to maintain and improve its facilities while ensuring reliable, high-quality water and exemplary customer service. The District would like to thank the community for their support.
Captain John B. Montgomery, USS Portsmouth, claims Pueblo of Yerba Buena for the USA. Renamed “Town of San Francisco”. Population of San Francisco = 800.
Gold discovered at Sutter’s Mill.
Drinking water (shipped from Marin County) sold by the barrel and bucket in San Francisco. San Francisco’s population swells to 40,000.
San Francisco City Water Works lays first pipelines in San Francisco.
Spring Valley Water Works franchised by State Legislature. San Francisco population = 78,000.
Spring Valley Water Works completes construction of Pilarcitos Dam and tunnel, bringing water supply to San Francisco that year (and rivaling San Francisco City Water Works). The vision was for Pilarcitos to be a main water supply for San Francisco.
Spring Valley Water Works buys San Andreas Valley and watershed and starts construction of San Andreas Dam (near present day San Bruno/Highway 280).
Stone Dam completed by Spring Valley Water Works.
Upper Crystal Springs Dam completed by Spring Valley Water Works.
San Francisco mayor buys Tuolumne River water rights.
Plans for development of Hetch Hetchy reservoir and water system solidify. Board of Army Engineers recommends Hetch Hetchy as best water supply for San Francisco.
San Francisco ratifies Raker Act. President Wilson signs Raker Act into law, paving the way for the development of Hetch Hetchy.
Construction of the Hetch Hetchy Railroad starts.
O’Shaughnessy Dam Diversion Tunnel completed to a height of 226.5 feet.
Construction begins on trestle bridge on Dumbarton Strait for Bay Crossing Pipeline.
San Francisco purchases Spring Valley Water Company (formerly Spring Valley Water Works) for $40 million.
Coastside is settled as an agricultural outpost and fishing community, originally named “Spanishtown”.
Ocean Shore Railroad brings visitors to the Coastside. (Coastside thrives during Prohibition!)
Principal water sources for the Coastside are two reservoirs and local wells near Apanolio Creek and McMahon Creek (El Granada).
First bond issue for $300,000 approved by voters 582 to 28.
The District installs pipelines in Princeton; 1st tank in El Granada; purchases Carter Hill site (behind high school) and constructs 1st tank; purchases 300 acres of land adjacent to San Francisco’s watershed in Pilarcitos Canyon, installs wells and considers possibility of a dam on the site.
Pescadero Dam is proposed to bring water to the entire Coastside. Project is pursued during 1960s and ultimately cancelled in 1971.
El Granada Highlands, Miramar and other communities develop. The District installs distribution pipelines and tanks in El Granada, Miramar, and at Carter Hill to supply water storage.
The District’s new office at 766 Main Street is completed.
Record drought. Board approves a moratorium on new water connections. First drought ordinances adopted prohibiting non-essential uses of water.
State mandates construction of a water treatment plant in Half Moon Bay, and the District obtains $1.5 million loan for financing.
Crystal Springs Water Supply Project designed by CH2mHill and Kennedy/Jenks/Chilton Engineers.
Second critical drought occurred requiring water use rationing of 25%.
Ground-breaking ceremony for Crystal Springs Water Supply Project.
Denniston Water Treatment Plant Improvement Project is completed.
The District completes replacement of original pre-1940s pipeline into downtown Half Moon Bay and the southern end of the District.
The District installs a Booster Pump Station at Denniston and the Bridgeport Transmission Pipeline to improve the resiliency of the system and to move potable local source water south and District-wide.
The District implements advanced metering infrastructure along with the “WaterSmart” customer web portal to allow meters to be read remotely and enable faster leak detection.
The District begins $9M upgrade to Nunes Water Treatment Plant.