The Sierra Club is suing the Imperial Irrigation District over its latest Colorado River water conservation agreement, arguing the plan would accelerate shrinking of the Salton Sea and harm neighboring communities’ health.

Announced last Friday, the lawsuit against the district and the U.S. Bureau of Reclamation, contends that a plan to temporarily forgo hundreds of thousands of acre-feet of water from the depleted river failed to adequately consider its impact on the largest lake in the region.