31 NYC Cooling Towers Test Positive for Legionella Bacteria

2026-07-11
31 NYC Cooling Towers Test Positive for Legionella Bacteria

New York City officials identified 31 cooling towers testing positive for Legionella bacteria following a recent Legionnaires' disease outbreak investigation.

Official Findings and Building Locations

The New York City Department of Health and Mental Hygiene released a preliminary list of building addresses on Friday. These locations contain cooling towers that have tested positive for Legionella, the bacteria responsible for causing Legionnaires' disease.

Cooling towers are large systems used in commercial and industrial buildings to reject heat. When these systems are not properly maintained, they can become breeding grounds for bacteria. If contaminated water is aerosolized through these towers, people in the surrounding area may inhale the bacteria, leading to infection.

Public Health Response

Health officials are monitoring the situation closely as part of an ongoing investigation into the cluster of illnesses. The city is working with building owners to ensure immediate remediation of the identified sites. Required actions typically include:

  • Immediate disinfection of the contaminated cooling towers.
  • Rigorous testing of water samples to confirm the eradication of bacteria.
  • Enhanced maintenance protocols to prevent future outbreaks.

While the list is currently preliminary, the city intends to provide updates as further testing is completed. Residents in the vicinity of the listed addresses are advised to follow health department guidance regarding potential exposure.

Understanding Legionnaires' Disease

Legionnaires' disease is a severe form of pneumonia caused by Legionella bacteria. It is not spread from person to person but is contracted by breathing in small droplets of water containing the bacteria. Symptoms often include fever, cough, shortness of breath, and muscle aches.

The city's proactive testing aims to isolate potential sources of aerosolized bacteria to limit the spread of the disease. Officials emphasize that maintaining strict adherence to water management plans is essential for high-rise and commercial building safety in urban environments.

Read more
Recommendations
Recommendations