Two powerful Southern California water districts are actively negotiating an agreement for hefty voluntary cuts of Colorado River supply to farmers and reduced delivery of water to greater Los Angeles, as part of urgent efforts across seven states and Mexico to stave off the collapse of the drought-stricken river system that provides drinking water and irrigation for nearly 40 million people.

Responding to a June mandate from the U.S. Bureau of Reclamation for all those who rely on the river to cut 2 million to 4 million acre-feet of water usage within 60 days, Imperial Irrigation District and Metropolitan Water District officials are negotiating “around half a million, between 400,000 and 500,000 acre-feet” in combined reductions, IID general manager Enrique Martinez said on Monday.