Efforts to expand a reservoir in the East Bay and share the additional water with San Francisco and others in the region have fallen apart after years of planning. The Contra Costa Water District, which has been pursuing the enlargement of the Los Vaqueros Reservoir in the hills near Brentwood, confirmed Monday that it’s seeking to end its commitment to the $1.5 billion project, citing increasing costs and regulation. The reservoir expansion had marked a collaborative and widely supported push to boost water supplies in the Bay Area after years of drought. Its termination leaves the eight partnering water agencies, which include the San Francisco Public Utilities Commission, East Bay Municipal Utility District and Santa Clara Valley Water District, with one less source of water for patching up future shortages.

Related article:

• KQED: Major East Bay reservoir expansion Is axed after years of rising costs, waning interest
• SFGate: Yearslong effort to expand Bay Area reservoir by 37 billion gallons faces sudden collapse
• NBC Bay Area: Contra Costa County reservoir expansion project called off