New York City health officials confirmed 14 cases of Legionnaires’ disease in the Upper East Side, with the outbreak tied to ZIP codes 10028, 10128, and 10075. The disease, caused by Legionella bacteria, spreads through contaminated water droplets, not person-to-person contact. Mayor Zohran Mamdani assured residents that tap water remains safe for drinking, bathing, and cooking, while testing of cooling towers in the affected area continues.
Immediate Action & Core Facts
The New York City Health Department expanded the investigation area after identifying 14 cases, with no deaths reported. Officials urge anyone who visited Central Park’s east side between East 76th and East 97th Streets to monitor for flu-like symptoms. The outbreak’s source remains under investigation, with cooling towers as a primary suspect.
Deeper Dive & Context
Outbreak Details
Legionnaires’ disease is a severe pneumonia caused by Legionella bacteria, often spread through mist from cooling towers. Symptoms include fever, muscle aches, and shortness of breath. The disease can be fatal if untreated. The current outbreak follows a 2025 cluster in Harlem, which resulted in 114 cases and seven deaths.
Official Response
Mayor Mamdani emphasized that home water systems are safe, while Health Commissioner Dr. Alister F. Martin praised the department’s efforts in testing and community outreach. Testing of cooling towers began over the July Fourth weekend and is ongoing. The Health Department has not yet identified a specific source of the outbreak.
Public Health Measures
Officials are monitoring the situation closely, with the potential for additional cases as testing continues. The 2025 outbreak led to stricter cooling tower maintenance regulations, which are now being enforced. Residents are advised to seek medical attention if they experience symptoms.