Key facts
- Since 2017, 70% of inspections of New York City's 5,000 registered cooling towers resulted in violations.
- Nearly 10% of these violations were classified as public health hazards related to Legionella bacteria.
- The city is currently responding to an outbreak on the Upper East Side with 64 reported cases.
- At least 76 building owners have been ordered to clean and disinfect their cooling towers.
- Most buildings testing positive for Legionella in the current outbreak had previous violations.
A significant portion of New York City's cooling towers have been found to be in violation of health laws, raising concerns about the city's ability to manage Legionnaires' disease outbreaks. Since 2017, 70% of inspections of the approximately 5,000 registered cooling towers across the city have resulted in violations, according to an analysis of data from the New York City Health Department.
Of these violations, nearly 10% were identified as public health hazards specifically linked to Legionella bacteria. These hazards include a lack of maintenance programs, failure to test for the bacteria, or neglecting corrective actions after elevated test results. Experts emphasize that these are not mere administrative issues but direct contributors to the city's recurring outbreaks.
The city is currently responding to an outbreak on the Upper East Side, with 64 reported cases of Legionnaires' disease. As a result, nearly 200 cooling towers in the area have been tested, and at least 76 building owners have been ordered to drain, clean, and disinfect their systems. Health officials stated that building owners found not to be properly maintaining their towers will face violations.
Notably, almost all buildings on the Upper East Side that tested positive for Legionella in the current outbreak had prior violations, with at least five having failed inspections within the last 12 months. Only a small fraction of buildings ordered to remediate their towers had no prior public health hazard violations since 2017.
Environmental health experts note that cooling towers provide an ideal environment for Legionella to grow and disseminate due to moisture, biofilm, and suitable temperatures, especially when maintenance is poor. New York City enhanced its cooling tower regulations in November, requiring testing every 31 days and increasing fines for non-compliance, following previous outbreaks in 2015 and last year.
Experts suggest that current laws rely heavily on owner self-certification, with limited third-party oversight. They advocate for more real-time public disclosures of tower compliance and for building management to treat maintenance programs as operational documents rather than mere filing requirements. Legionnaires' disease is often underdiagnosed, and while most exposed individuals do not get sick, risk factors include age, underlying illnesses, and smoking.