New York City Legionnaires' disease outbreak Archives

August 12, 2025 zacherlaw 0 Comments

Legionnaires’ in Harlem: When Public Health Fails the Same Neighborhoods Again and Again

It’s happening again. Another outbreak of Legionnaires’ disease in New York City — this time in central Harlem, where 73 people have fallen ill and three people have died, according to the NYC Department of Health as of August 7, 2025. Officials believe the likely culprit is a cooling tower — those big rooftop structures that help regulate temperature in buildings but can become deadly if they aren’t properly cleaned and maintained. When they’re contaminated with Legionella bacteria, they can spew mist into the air, carrying an invisible, lethal threat into the streets below. But if you’ve followed Legionnaires’ outbreaks…

August 6, 2025 zacherlaw 0 Comments

When the Mist Turns Deadly: A Legionnaires’ Outbreak in Harlem Brings Back Old Warnings

It’s the middle of summer in New York City, and the hum of air conditioners is a familiar soundtrack. But in central Harlem, that sound comes with a warning. As of August 5, at least 58 people have contracted Legionnaires’ disease — and two have died — in an outbreak believed to be tied to a contaminated cooling tower. Again. The city’s health department is testing towers in the area encompassing the zip codes 10027, 10030, 10035, 10037, and 10039, and bordering communities. So far, 11 cooling towers have tested positive for Legionella pneumophila. The city’s health department is urging…

November 13, 2018 zacherlaw 0 Comments

English v US Approach to Legionella Control

As previously reported in a blog posted October 12, 2018, the US approach to controlling legionella is different from the United Kingdom. The UK approach is national in nature and very strict. Two recent examples include a leisure center in Walton-on-the-Naze being criminally prosecuted by the Health and Safety Executive ( UK government agency responsible for the encouragement, regulation and enforcement of workplace health, safety and welfare) for an outbreak of Legionnaires’ disease two years ago. Another case involved a care home being fined 600,000 pounds (approximately $777,000.00) after pleading guilty to the death of a 90 year old who died…

November 6, 2018 zacherlaw 0 Comments

Connecting the Dots-Second Washington Heights Outbreak Is Just The Tip of The Iceberg

Connecting the dots is part of what this blog is all about. You may remember that significant regulations were passed in New York City in 2015 because of the outbreak of Legionnaires’ disease (see my blog of October 25, 2018). Unfortunately, these regulations are not being properly enforced by the city health department. As a result, 90% of the cooling tower cases heard by an administrative agency charged with enforcing the regulations have been dismissed. This is despite the fact that there has been 65% increase in Legionnaires’ disease cases from 2016 to 2017. Even Mayor De Blasio has criticized…

October 25, 2018 zacherlaw 0 Comments

New York City Admits Still Does Not Know Where All Cooling Towers Are

New York City Council enacted a law in 2015 after a deadly outbreak of Legionnaires’ disease in the Bronx. The law requires that every cooling tower in New York City be identified, registered and inspected on a regular basis. The city has admitted recently that it is not sure it has found all cooling towers, three years after the legislation was passed (the city health department uses experts on the street and satellite imagery to find cooling towers). This failure to even identify all cooling towers takes on added significance after one remembers that there have been two recent outbreaks…

October 24, 2018 zacherlaw 0 Comments

Cooling Towers as a Source of Legionnaires’ Disease

This office has had numerous inquiries regarding persons contracting Legionnaires’ disease. Often times the person does not know where they acquired the disease. Unfortunately, many times the person acquired the disease from a cooling tower. The cooling tower need not be in the vicinity of the person who acquired the disease, or even have been identified by health authorities. Consequently, the person may not know that a cooling tower has caused him or her to get sick. These cases are considered sporadic in nature. On the other hand, when a cooling tower has been identified as the source, as in…

October 17, 2018 zacherlaw 0 Comments

New York State Regulation of Legionella-A Real Step Forward

As promised, this blog will cover US legislative attempts to control the bacteria legionella that causes Legionnaires’ disease. While many states have requirements as to the amount of residual chlorine that must be present in spas, no state has legislation to curtail legionella in cooling towers than New York. Unfortunately, the New York legislation does not cover the potable water system (showers, faucets, holding tanks, etc.) in a building, or any water feature such as a lobby fountain. This is completely different from the approach taken in the UK as explained in an earlier blog, which is national in nature…

October 12, 2018 zacherlaw 0 Comments

US Approach to Controlling Legionnaires’ disease

There is no national legislation controlling the propagation of the legionella bacteria in buildings, cooling towers, or jacuzzis in the United States. In fact, there is only one state, New York, that has any statewide legislation to control legionella growth in the state’s cooling towers. Various states have levels of residual chlorine that must be in spas. This haphazard and inadequate approach is very different from that taken by the United Kingdom as indicated in a previous blog. It is time therefore, for Congress to address a national problem and enact national legislation to control the increasing incidence of Legionnaires’…

February 12, 2018 zacherlaw 0 Comments

A Brief History of Legionnaires’ Disease (Part II)

In a previous post, we discussed the origins and very early beginnings of Legionnaires’ disease. In this post, we are hoping to slowly move through time and discuss some significant outbreaks and moments of Legionnaires’ disease history. Perhaps the first major outbreak after the 1976 Philadelphia incident would be with Stafford, England. In April 1985, approximately 175 people were admitted into the Kingsmead Stafford Hospital with pneumonia. Of these cases, around 28 individuals ended up dying with the origin of the infection being discovered to be the Stafford District Hospital. About a decade later, in March 1999, the Bovenkarspel legionellosis…

January 23, 2018 zacherlaw 0 Comments

New York Posts Record High Year for Cases of Legionnaires’ Disease

In August of 2015, 133 Bronx residents contracted Legionnaires’ disease, an outbreak which ultimately resulted in the death of 16 individuals. This incident would be the worst recorded outbreak of Legionnaires’ disease in New York state’s history however now, more than two years later, New York continues to show problems as 2017 posts a record number of cases, including a far larger rate of Legionnaires’ disease than just about every other state per capita. New York once again led the United States for reported cases of Legionnaires’ disease in 2017 with a total of 1,009 cases reported to the CDC. And far from the situation improving, this rate of…