Title: New York metropolitan area
Content:  Water purity and availability are a lifeline for the New York metropolitan region. New York City is supplied with drinking water by the protected Catskill Mountains watershed. As a result of the watershed's integrity and undisturbed natural water filtration system, New York is one of only four major cities in the United States the majority of whose drinking water is pure enough not to require purification by water treatment plants. The Croton Watershed north of the city is undergoing construction of a US$3.2 billion water purification plant to augment New York's water supply by an estimated 290 million gallons daily, representing a greater than 20% addition to the city's current availability of water. The ongoing expansion of New York City Water Tunnel No. 3, an integral part of the New York City water supply system, is the largest capital construction project in the city's history, with segments serving Manhattan and The Bronx completed, and with segments serving Brooklyn and Queens planned for construction in 2020. Much of the fresh water for northern and central New Jersey is provided by reservoirs, but numerous municipal water wells exist which accomplish the same purpose.
Title: Food and water in New York City
Content:   Government officials, labor organizers, non-profits, community advocacy groups, and residents have a great dependency on rural farmers who develop New York City's local food shed. The process of linking agriculture with New York City's urban markets has been largely built upon the fact that New York City's water supply comes from the protected Catskill Mountains watershed in Upstate New York. New York City's water supply system, the largest surface storage and supply complex in the world, yields 1.2 e9USgal of water daily, with most of this water originating upstate. This water is unfiltered, and a filtration system would require $8–10 billion in construction as well as $1 million in daily maintenance. Instead, New York City's watershed is protected by severe New York City Department of Environmental Protection restrictions that prevent pathogens and nutrients from entering the water supply. As a result of protection of the watershed, New York is one of four major cities in the United States with drinking water that is pure enough to not require purification by water treatment plants. However, the implementation of such stringent regulations is costly to New York State farmers.
Title: Manhattan
Content:  New York City is supplied with drinking water by the protected Catskill Mountains watershed. As a result of the watershed's integrity and undisturbed natural water filtration system, New York is one of only four major cities in the United States the majority of whose drinking water is pure enough not to require purification by water treatment plants. The Croton Watershed north of the city is undergoing construction of a US$3.2 billion water purification plant to augment New York City's water supply by an estimated 290 million gallons daily, representing a greater than 20% addition to the city's current availability of water. Manhattan, surrounded by two brackish rivers, had a limited supply of fresh water. 
Title: New York City
Content:  New York City is supplied with drinking water by the protected Catskill Mountains watershed. As a result of the watershed's integrity and undisturbed natural water filtration system, New York is one of only four major cities in the United States the majority of whose drinking water is pure enough not to require purification by water treatment plants. The city's municipal water system is the largest in the United States, moving over one billion gallons of water per day. The Croton Watershed north of the city is undergoing construction of a $3.2 billion water purification plant to augment New York City's water 
Title: Environmental issues in New York City
Content:  Many of the city's environmental assets are related to geography and a long tradition of environmental stewardship in the mountain ranges north of the city. Because the watershed is in one of the largest protected wilderness areas in the United States, the natural water filtration process remains intact. As a result, New York is one of only five major cities in the United States with drinking water pure enough to require only chlorination to ensure its purity at the tap under normal conditions. However, all groundwater entering New York City's distribution system is treated with chlorine, fluoride, food-grade phosphoric acid, and, in some cases, sodium hydroxide. New York City uses 
Title: New York City water supply system
Content:   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 mi 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 130000 acre since 1997. With all the care given, the city's water supply system is 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.
Title: New York City water supply system
Content:  New York City's water system consists of aqueducts, distribution pipes, reservoirs, and water tunnels that channel drinking water to residents and visitors. A comprehensive raised-relief map of the system is on display at the Queens Museum of Art. Until the early 21st century, some places in southeastern Queens received their water from local wells of the former Jamaica Water Supply Company.
Title: Drinking water quality legislation of the United States
Content:  The New York State Department of Health has primacy for most of the water supply regulation compliance determination and enforcement in New York. The department sets general policy and oversees the local units, which may be district offices, regional offices, or county health departments, who oversee the public water systems.
Title: Newark water crisis
Content:  Much of the drinking water in Newark, and Northern New Jersey in general, comes from reservoirs. Drinking water then is processed through water treatment plants to the final destinations throughout the region. The water pipes that connect the main pipes to homes and businesses were lined with lead along with other chemicals. The water destroyed the lead-lined pipes, causing the lead to leak into the water supply. The management of the city's water safety plan is under the jurisdiction of the Newark Watershed Conservation and Development Corporation (NWCDC), under the direction of a board appointed by the mayor of Newark. The New Jersey State Comptroller released a report in 2014 detailing widespread corruption throughout the agency. In early 2016, multiple agency officials were arrested and charged with accepting bribes.
Title: New York City water supply system
Content:  The NYW finances the capital needs of the water and sewer system of the city through the issuance of bonds, commercial paper, and other debt instruments. It is a public-benefit corporation created in 1985 pursuant to the New York City Municipal Water Finance Authority Act. The authority is administered by a seven-member Board of Directors. Four of the members are ex officio members: the Commissioner of Environmental Protection of the City, the Director of Management and Budget of the City, the Commissioner of Finance of the City, and the Commissioner of Environmental Conservation of the State. The remaining three members are public appointments: two by the Mayor, and one by the Governor.

Question: where does new york drinking water come from?
Answer: the eastern Catskill Mountains.