New York City orders cooling‑tower inspections amid Upper East Side Legionnaires’ disease outbreak

New York City health officials are investigating a Legionnaires’ disease cluster in the Upper East Side neighborhoods of Carnegie Hill and Yorkville (ZIP codes 10028, 10128, 10075). As of early July, 30‑plus residents have been confirmed ill, with roughly two‑thirds hospitalized and no deaths reported.

The likely source is at least one contaminated cooling tower atop a building within the one‑square‑mile area from East 74th to East 96th Street. The city has begun testing all towers in the zone; many have received violations for missed cleaning, testing, or reporting, and eight towers have failed to submit Legionella samples since March 2025. New legislation enacted in May now requires monthly Legionella testing, up from quarterly.

Council Speaker Julie Menin has urged Health Commissioner Dr. Alister Martin to issue an emergency order for immediate disinfection of all towers in the affected area. City inspectors are already ordering remediation of towers that test positive, and the mayor’s office plans to publicize addresses of contaminated sites.

Officials advise residents that the outbreak is not linked to building plumbing or tap water, and they can continue normal water use. They encourage anyone with flu‑like symptoms to seek medical care promptly.