In 1991, Inyo County and the city of Los Angeles signed the Inyo-Los Angeles Long Term Water Agreement, which required that groundwater pumping be managed to avoid significant impacts while providing a reliable water supply for Los Angeles. In 1997, Inyo County, Los Angeles, the Owens Valley Committee, the Sierra Club, and other concerned parties signed a Memorandum of Understanding that specified terms by which the lower Owens River would be re-watered by June 2003 as partial mitigation for damage to the Owens Valley.