I couldn't wrap my head around how such a polluted city could have such clean water and found this:
"New York City drinking water springs from 125 miles away in the Catskill Mountains -- 90% of the water comes from the Catskill/Delaware watershed, where waters from tributary rivers collect in 19 reservoirs. The other 10% comes from smaller watersheds in Westchester and Rye -- all of it traveling through vast underground aqueducts to supply the city’s residents."
"New York City drinking water springs from 125 miles away in the Catskill Mountains -- 90% of the water comes from the Catskill/Delaware watershed, where waters from tributary rivers collect in 19 reservoirs. The other 10% comes from smaller watersheds in Westchester and Rye -- all of it traveling through vast underground aqueducts to supply the city’s residents."