The drinking water tunneling project is scheduled to begin in 2025 with a price tag of $1.2 billion. The New York City Department of Environmental Protection (DEP) announced a $1.2 billion drinking water project that will include construction of a 2-mile tunnel between Kensico Reservoir and an ultraviolet treatment plant in Eastview, N.Y. The tunnel is slated to be the largest water tunneling project in Westchester, N.Y., since the 1940s.