The Hetch Hetchy Water System is a water supply system that provides drinking water to the city of San Francisco and surrounding areas. It originates from the Hetch Hetchy Valley in the Yosemite National Park, where water is collected from the Tuolumne River. The system includes reservoirs, aqueducts, and treatment facilities to ensure clean and reliable water delivery. Constructed in the early 20th century, the Hetch Hetchy system was built to meet the growing demands of urban populations. It plays a crucial role in supplying water for residential, commercial, and industrial use, while also supporting fire protection and irrigation needs in the region.