The latter two aqueducts provide 90% of New York City's drinking water, and the watershed for these aqueducts extends a combined . Two-fifths of the watershed is owned by the New York City, state, or local governments, or by private conservancies. The rest of the watershed is private property that is closely monitored for pollutants; development upon this land is restricted. The DEP has purchased or protected over of private land since 1997 through its Land Acquisition Program. Water from both aqueducts is stored first in the large Kensico Reservoir and subsequently in the much smaller Hillview Reservoir closer to the city.