NEW YORK CITY — New York City's drinking water is globally renowned. Its taste wins blind competitions. Its source — vast protected reservoirs in the Catskill Mountains and Delaware watersheds — is among the cleanest surface water in the world. But what happens after that water leaves the reservoir, travels through aging infrastructure, and enters the plumbing of a pre-war apartment building in the Bronx, a 1940s rowhouse in Brooklyn, or a Harlem public housing complex built in the 1950s is a different story entirely. According to the most current estimates from the NYC Department of Environmental Protection (DEP), approximately 21% of New York City residents — nearly 1.85 million people — may be drinking water delivered through lead or probable-lead service lines.
A comprehensive 2026 water quality assessment combining DEP annual reports, Environmental Working Group (EWG) health guidelines, and EPA violation history data reveals a city-wide contamination picture that goes well beyond lead: disinfection byproducts (TTHMs) averaging 56 parts per billion and HAA5 averaging 65 ppb — levels hundreds of times above EWG health thresholds — alongside detectable chromium-6, chloroform, bromodichloromethane, and haloacetic acids. And a $2 billion Delaware Aqueduct bypass tunnel project meant to repair a massive underground leak has been delayed again, now not expected to reach completion until after 2027.
