Experts said it involves two water storage and delivery systems -- the federally managed Central Valley Project (or CVP) and the state-controlled State Water Project (or SWP), from which Kern County gets most of its water.

It's unclear exactly what, if anything, was "turned on" in California, but the Department of Water Resources said no military entered the state.

California water regulators have said there's no truth to President Donald Trump's claim that the U_S_ military entered the state and “turned on the water.”