An increasing number of solutions to California and Arizona’s long term water problems now involve Mexico. Some of the ideas are seemingly far-fetched, like a pipeline to bring water from the Gulf of California to the Salton Sea in Imperial County. Some are already happening, like Mexico agreeing to reduce its water use in the event of a Colorado River shortage.After decades of warnings, officials who rely on the Colorado River which provides water to 40 million Americans and Mexicans  have begun to reckon with the long-known fact that cities and farms are expecting to receive more water from the river than the river usually holds.