Protecting families from contaminated food and water
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Protecting families from contaminated food and water
Posted in Legionella,Legionnaire's disease,Our Blog,Outbreaks & Recalls on July 12, 2026
After surveillance testing prompted by a recent cluster of Legionnaires’ disease illnesses began, the NYC Health Department has finally published the list of buildings positive for Legionella bacteria. The germ responsible for Legionnaires’ disease.
Until Friday, investigators had only narrowed down the area to the Upper East Side of the City. These Legionnaires’ disease cases appeared to have a connection to three specific zip codes. Now, specific buildings have been identified.
Here’s what we know so far about the Legionnaires’ disease outbreak, the buildings positive for Legionella bacteria, and what this all means.
According to the NYC Health Department, as of July 11, 2026, at least 56 people have been connected to this Legionnaires’ disease cluster in the Upper East Side. Only 9 did not require hospitalization. At least 16 people are currently hospitalized, while 31 have been discharged. No deaths have been reported so far.
This community cluster involves Carnegie Hill and Yorkville neighborhoods in 10028, 10128, and 10075 ZIP codes.
Initial positive Legionella tests were reported on June 27 and June 29, 2026. Beginning in July, case counts began rising. On July 1, 2026 another two cases were added to the cluster. July 2, another nine. Then five on July 3, six on July 4, six on July 5.
Cases kept going from there. Eight were added on July 6. Ten on July 7. Five on July 8 and another on July 9.
It can take several days for test results to return from the laboratory and make it to updated outbreak statistics. So, it is likely we will see more cases added, despite decontamination efforts, until the problem is fully resolved.
This Legionnaires’ disease outbreak in the Upper East Side has been attributed to cooling towers for buildings positive for Legionella. But why are cooling towers suspected for illnesses in this area?
Legionnaires’ disease is spread by inhaling airborne water particles with these microscopic bacteria in tow. There are several common ways this happens.
Certain human-made water systems are better suited for growing and spreading harmful Legionella bacteria. But anything that generates a mist or spray can spread bacteria. Fixtures like hot tubs, decorative fountains and water features, and even shower heads and sink faucets. These germs love warm water. So things like hot tubs and hot water tanks and heaters are especially vulnerable. As are stagnant water systems such as those with large, complex plumbing systems. Especially those under construction or with dead legs.
However, cooling towers (like those used in large building’s air-cooling systems or industrial processes) are the most common source of Legionnaires’ disease outbreaks.
In this case, the community cluster spans multiple buildings, which is another clue. If the problem came from the plumbing system, the outbreak would be limited to a single building.
So, which buildings are impacted?
The long-awaited list of buildings positive for Legionella has been published. So, which ones are they?
This list may be expanded as further testing is performed.
Tests performed by NYC Health Department use a laboratory procedure known as PCR. This is a “polymerase chain reaction” assay that analyzed the DNA in a sample. It finds specific gene segments associated with an organism (in this case Legionella) and, if present, replicates it to quantities sufficient for identification.
It can detect very small quantities of these organisms, making it accurate in even small sample sizes. As a bonus, the test has a faster turn-around time than microbiological procedures.
However, there is a big limitation.
The test used by the NYC Health Department cannot distinguish between live and dead Legionella bacteria. DNA is DNA, whether it is alive or dead.
So, what does this mean?
It means that it is possible that some of the cooling towers have become contaminated at some point, performed sufficient disinfection, but the germ has not been flushed from the system.
Unfortunately, only costly and time-consuming microbiological cultures can make that determination. With an expanding outbreak that grows each day, this initial method employed by the NYC Health Department makes since. After all, the presence of a dead organism still warrants attention. At one point, the cooling tower did have live Legionella bacteria.
Culture tests are currently being performed, but the results will not be available for several weeks. In the meantime, “owners of all towers with positive initial results must immediately drain, clean, and disinfect their cooling towers to reduce the risk of further exposure.”
Legionnaires’ disease is an especially dangerous lung infection because of the high mortality rate.
Legionnaires’ disease symptoms should be taken very seriously. Most Legionnaires’ disease cases require hospitalization and can be fatal. In fact, 1 in 10 individuals with Legionnaires’ disease will die from complications of their illness. In a health care setting, this risk elevates to 1 in 4.
So, how do you know if you have Legionnaires’ disease?
Common symptoms of Legionnaires’ disease include:
These symptoms usually begin around 2 to 14 days after exposure. However, in some cases, illness may take longer to present.
Other symptoms may include diarrhea, nausea, and/or confusion.
If you believe you have Legionnaires’ disease, there are some important things you should do.
If you begin experiencing Legionnaires’ disease symptoms, you should contact your health care provider right away. Be sure to indicate your potential exposure risk. This can help expedite necessary laboratory tests that can accurately diagnose your illness.
NYC Health has provided a help line to help New Yorkers find a provider “regardless of immigration or insurance status.” Visit NYC Health + Hospitals or call 311 or 844-NYC-4NYC (844-692-4692).
If you have been impacted by Legionnaires’ disease and live, work, or have visited near buildings positive for Legionella, it is a good idea to get advice from an experienced Legionnaires’ disease lawyer. A Legionnaires’ disease lawyer can answer your questions, point you in the direction of resources, gather evidence on your behalf, and represent you as needed.
If you or a family member live, work, or have visiting near buildings positive for Legionella and have been impacted by Legionnaires’ disease, The Lange Law Firm, PLLC has a Legionnaires’ disease lawyer that can help.
Call (833) 330-3663 or send an email for a free, no-obligation consultation.
By: Heather Van Tassell (contributing writer, non-lawyer)