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A combination of aqueducts, reservoirs, and tunnels supply fresh water to New York City. With three major water systems (Croton, Catskill, and Delaware) stretching up to 125 miles (201 km) away from the city, its water supply system is one of the most extensive municipal water systems in the world.
New York's water treatment process is simpler than most other American cities. This largely reflects how well protected its watersheds are. The city has sought to restrict development surrounding them. One of its largest watershed protection programs is the Land Acquisition Program, under which the New York City Department of Environmental Protection (DEP) has purchased or protected, through conservation easement, over 130,000 acres (53,000 ha) since 1997. With all the care given, the city's water supply system is partially exempted from filtration requirements by both the federal and the state government, saving more than "$10 billion to build a massive filtration plant, and at least another $100 million annually on its operation". Moreover, the special topography the waterways run on allows 95% of the system's water to be supplied by gravity. The percentage of pumped water does change when the water level in the reservoirs is out of the normal range.

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