The United States government will pay Southern California’s main water wholesaler up to $65 million to leave 200,000 acre-feet of Colorado River supplies in Lake Mead this year, a stopgap measure that will raise the reservoir by three feet by December and delay the risk of critically low levels that could slash hydropower output at Hoover Dam. The agreement, approved by the Metropolitan Water District’s board, is part of a broader tri-state effort to conserve nearly 700,000 acre-feet in the nation’s largest reservoir, which sits just two feet above its 2022 record low and is projected to set a new low within weeks.

Funding from the 2022 Inflation Reduction Act underpins the deal, alongside separate pacts with the Quechan Tribe and Bard Water District to add agricultural water in 2027–28. Officials in Los Angeles describe the move as a temporary fix that buys time while the seven Colorado River basin states negotiate long-term rules. In Mexico, the federal government is pursuing a more structural response to water stress: a 20-billion-peso (roughly $1.1 billion) six-year programme to restore the heavily polluted Atoyac, Lerma-Santiago and Tula rivers. The environment ministry reports 93 projects across ten states, with early-stage progress reaching 90 per cent on some stretches. Inspectors have identified 479 clandestine dumps and 460 potentially contaminating industries, and have imposed sanctions and closures.

On California’s coast, a different kind of water-related programme faces an immediate funding cliff. The California Beach Shark Safety programme at Cal State Long Beach, which tags juvenile great whites and shares real-time location data with lifeguards along 500 miles of coastline, will run out of money in September unless new donors are found. The $1-million-a-year operation has tagged 380 sharks and operates buoy systems that help communities avoid unnecessary beach closures. With warming waters drawing more sharks near shore, researchers warn that removing the equipment would leave lifeguards ‘flying blind’.

Separately, Mexico and Panama have deepened cooperation on an agricultural pest, with Panama supplying sterile screwworm flies to a new Mexican plant in Chiapas, and on the neutrality of the Panama Canal, where Mexico backs the Torrijos-Carter treaties. The next milestones are immediate: Lake Mead is expected to hit a new record low by the end of July, and the shark lab’s equipment must be pulled from the water in September absent fresh funding.