In light of the foreseen shortage, Metropolitan, for the first time in its nearly 100-year history, is mandating that restrictions be put in place for parts of Los Angeles, San Bernardino and Ventura counties that receive water through the State Water Project, which pipes water down from the Northern Sierra Nevada Mountains and the Sacramento-San Joaquin River Delta. They have two options: they can either implement volumetric limitations, or demand customers reduce their outdoor watering to one day a week by June 1.