There most likely is at least one water main underneath every street in the city. Virtually every building in the city is then connected to the municipal system through smaller pipes called service lines. | Viewing NYC

New York Times Explores How New York Gets Its Water for New Column "New York 101"

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There most likely is at least one water main underneath every street in the city. Virtually every building in the city is then connected to the municipal system through smaller pipes called service lines.