Can Canada turn a “giant faucet” and send water to California?

There is no giant faucet or existing system that can simply divert Canadian water to California at the scale claimed.

California moves large volumes of water through its own state and federal water projects, but no infrastructure currently connects Canadian freshwater supplies to California in the manner described by the 'giant faucet' claim. The 1909 Boundary Waters Treaty also regulates significant changes to shared transboundary waters. A continental diversion could be proposed and engineered in theory, but it would be a major new project — not something Canada can accomplish by turning an existing valve.

No. California has enormous aqueduct, reservoir and pumping systems, and some rivers that begin in Canada eventually flow into the United States, but there is no existing 'giant faucet' that can be turned to send Canadian water to California. Moving water at the scale implied would require a new continental diversion project, not the operation of a hidden valve.

Large-scale water diversion is physically possible in principle: California already moves water hundreds of kilometres within the state, and Canada and the United States jointly manage many transboundary waters. Southern California receives roughly a third of its water from Northern California, a third from the Colorado River and a third from local sources. Canada also has major freshwater systems and rivers, such as the Columbia, that cross the international boundary.

The claim turns real water infrastructure into a fictional single control point. California officials say there is no valve or spigot that can simply release additional northern water to solve the state's water problems, and there is no existing Canada-to-California canal or pipeline capable of the claimed diversion. A new cross-border diversion affecting shared waters would involve enormous engineering works plus federal, state, provincial, environmental and treaty approvals; under the Boundary Waters Treaty, some diversions affecting water levels or flows across the border require binational approval.

Claims that Canada can simply redirect vast amounts of shared water toward the United States distort how Canadian water resources, infrastructure, treaties, and sovereignty actually work—and can shape public reactions to cross-border water disputes.

A completed transboundary diversion project or other operating infrastructure capable of moving Canadian water to California at the scale claimed, together with the necessary legal and binational approvals, would materially change this assessment.

Direct transcript of Donald Trump's Sept. 13, 2024 Los Angeles-area press conference where he described a 'very large faucet' and Canadian water that could supposedly be turned toward California.

California has very large aqueduct, reservoir and pumping systems — Supported Some waters originating in Canada eventually flow into the United States — Supported There is an existing Canada-to-California 'giant faucet' or valve that can simply be opened — False Canada could unilaterally send the claimed volumes south without major infrastructure, legal and binational changes — False

Canada; United States

Donald Trump / press conference

Canada giant faucet water California Columbia River Trump

Fact check: Canada cannot turn a giant faucet and send huge amounts of water to California using existing infrastructure.