New York City Tightens Rules on Cooling Towers After Deadly Outbreaks

New York City is taking new steps to protect residents from Legionnaires’ disease. Following two major outbreaks over the last two summers, lawmakers are increasing regulations and inspections of cooling towers across the city. These towers, which are often found on top of hotels, hospitals, and large apartment buildings, use water to remove heat from air-conditioning systems. If these systems are not cleaned properly, they can grow a dangerous bacterium called legionella. This bacteria can then be released into the air and breathed in by people nearby.

According to The Guardian Health, the city’s health department recently tested samples from more than 180 cooling towers. The results were concerning, as 59 of those towers tested positive for the bacterium. These sites included a variety of public and private buildings, such as the Guggenheim Museum, a Whole Foods market, and a private school. This discovery comes after a difficult period for the city. In August 2025, an outbreak in the Harlem neighborhood led to seven deaths and more than 100 illnesses. This summer, an outbreak on the Upper East Side resulted in 94 cases, at least 79 hospitalizations, and 11 deaths, as reported by the city’s health commissioner, Dr. Alister Martin.

Experts emphasize that these deaths are largely preventable. Dr. William Schaffner, an infectious diseases expert at the Vanderbilt University School of Medicine, noted that the tools to stop the disease already exist. He explained that if building owners perform regular, rigorous maintenance, the risk of illness can be substantially reduced. Amy Pruden, a professor at Virginia Tech University, added that the danger is not limited to people inside the buildings. Because the bacteria can travel through the air, even people walking past a building can be exposed if the cooling system is not well maintained.

The situation is becoming more urgent as global temperatures rise. As the climate gets hotter, people rely more on air conditioning, which increases the use of cooling towers. According to experts, this makes the need for strict, consistent inspections more important than ever. However, there have been questions about whether the city was doing enough in the past. The Gothamist reported that the health department’s testing for the bacteria in cooling towers had decreased significantly before the 2025 outbreak occurred.

In response to these events, victims of the 2025 Harlem outbreak and their families have filed four lawsuits. These legal actions target the city, NYC Health + Hospitals, and the contractors responsible for maintaining the cooling towers. During a recent press conference, attorney Jared Scotto argued that building owners and companies must take responsibility for the risks they create. He was joined by civil rights attorney Ben Crump and the Rev. Al Sharpton to highlight the impact on the community. The plaintiffs argue that the failure to properly maintain these systems caused unnecessary suffering and loss of life.

Looking ahead, the city faces the challenge of ensuring that all building owners follow the rules. Proper maintenance requires workers to regularly clean and disinfect the towers and test the water for bacteria. If a test comes back positive, the owner must report it to the local health department immediately. While no system can be perfect, officials hope that these new, stricter measures will prevent future outbreaks. As Dr. Schaffner pointed out, the goal is to make sure that the tragedy of the last two years is not repeated. For now, the city continues to monitor the situation closely to ensure that the air remains safe for everyone living in or visiting New York.