Updated Oct. 26, 2026: rewritten as a full guide to Legionnaires’ disease, with what happened in New York City’s 2026 outbreak, symptoms, who is at risk and how to protect your home.
Quick answer: New York City declared its Upper East Side Legionnaires’ disease outbreak over on July 31, 2026. At that point CNN reported 7 deaths, and later reports raised the toll as more cases were linked. Investigators found Legionella bacteria in cooling towers at 83 buildings, which were ordered cleaned. Legionnaires’ is a serious pneumonia caused by breathing in tiny water droplets with the bacteria. It is not usually spread from person to person, and it is treated with antibiotics. See a doctor fast if you have fever, cough and shortness of breath, especially if you are 50 or older.
This guide explains what Legionnaires’ disease is, the warning signs, who faces the highest risk, and simple steps to lower your risk at home and when you travel. It also covers what building owners and renters should know, and the questions to ask a doctor.
The 2026 NYC outbreak at a glance
| Item | What was reported |
|---|---|
| Area | Upper East Side, Manhattan |
| Declared over | July 31, 2026 |
| Deaths when declared over | 7, per CNN |
| Later death toll | Reported as rising to 11 by late August, per news reports |
| Likely source | Building cooling towers |
| Buildings with positive towers | 83, ordered to drain, clean and disinfect |
Counts differ by source and date. The NYC Health Department has the official numbers. A separate 2025 outbreak in Harlem is a different event.
What is Legionnaires’ disease?
Legionnaires’ disease is a type of pneumonia, or lung infection, caused by Legionella bacteria. The bacteria live naturally in fresh water. They become a problem when they grow in building water systems, such as:
- Cooling towers on top of large buildings
- Hot tubs that aren’t cleaned and disinfected
- Large plumbing systems in hotels, hospitals and apartment buildings
- Decorative fountains
- Hot water tanks and heaters kept at warm, not hot, temperatures
People get sick by breathing in mist or tiny droplets that contain the bacteria. Drinking water normally does not cause it unless water goes into the lungs by accident while swallowing. A milder illness from the same bacteria is called Pontiac fever.
Symptoms to watch for
The CDC says symptoms usually start 2 to 14 days after exposure. They can look like other types of pneumonia or the flu:
- Cough
- Shortness of breath
- Fever
- Muscle aches
- Headache
- Sometimes diarrhea, nausea or confusion
A chest X-ray and a urine or lab test can confirm it. Tell your doctor if you recently stayed in a hotel, hospital, cruise ship or a building with a known outbreak.
Who is most at risk
| Higher-risk group | Why |
|---|---|
| People 50 and older | Immune defenses weaken with age |
| Current or former smokers | Lung damage makes infection easier |
| People with chronic lung disease, such as COPD | Lungs are already weakened |
| People with weak immune systems | From cancer treatment, transplants or certain medicines |
| People with diabetes, kidney failure or liver failure | Higher risk of serious illness |
Most healthy people exposed to Legionella do not get sick. But for high-risk people, it can be deadly, so early treatment matters.
What to do if you think you have it: 5 steps
- Call your doctor or go to urgent care if you have fever, cough and trouble breathing.
- Mention possible exposure, such as a recent hotel stay, hot tub use or living near an outbreak area.
- Ask about testing. A urine antigen test is common.
- Take antibiotics exactly as prescribed if you are diagnosed.
- Go to the ER for severe shortness of breath, chest pain or confusion.
Also read: How to Negotiate a Medical Bill
Made-up example (not real people): These are made-up examples to show when to get care.
Harold, 68, Manhattan develops a fever and cough a week after an outbreak is announced near his building. He calls his doctor the same day, mentions the outbreak and gets tested. He starts antibiotics early and recovers at home.
Nina, 35, Brooklyn has a mild cold with no fever and no breathing trouble. She rests at home and watches for worsening symptoms, which never come.
How to lower your risk at home
- Keep your water heater hot. The CDC and plumbing experts suggest temperatures high enough to discourage bacteria, while using anti-scald devices to prevent burns.
- Flush unused faucets and showers after travel or if a bathroom sits unused for weeks.
- Clean showerheads and faucet aerators regularly.
- Maintain hot tubs with proper disinfectant levels and regular cleaning.
- Use distilled or sterile water in CPAP machines and humidifiers, and clean them as the maker directs.
What renters and building owners should know
New York City requires owners of buildings with cooling towers to register them, test them and keep maintenance plans. After the 2026 outbreak, owners of 83 buildings had to drain and disinfect their towers.
- Renters: You can ask your landlord or building manager whether the building has a cooling tower and when it was last inspected. Report unusual water smells, rusty water or long periods of low hot water.
- Owners and managers: Follow local cooling tower rules, keep records and use a qualified water treatment company. Fines and legal costs can be high after an outbreak.
- Everyone: In NYC, you can report concerns by calling 311.
Traveling? Simple precautions
- Avoid hot tubs that look cloudy or smell strongly of chemicals.
- Run the shower on hot for a minute before stepping in at a hotel that seems little used.
- If you get sick within two weeks of a trip, tell your doctor where you stayed.
Common myths
- “You catch it from other people.” It is generally not spread person to person.
- “Only old buildings have it.” Any building water system can grow Legionella if poorly maintained.
- “Air conditioners in homes spread it.” Home window and central AC units don’t use water the way large cooling towers do.
- “It always kills.” Most people recover with antibiotics, though some need hospital care.
Paying for care
Pneumonia treatment can mean ER visits, tests and sometimes a hospital stay. Check your insurer’s network before a non-emergency visit, and ask for an itemized bill afterward. If you are uninsured or the bill is large, ask the hospital about financial assistance. Nonprofit hospitals must have charity care policies.
Timeline of the 2026 outbreak
| When | What happened |
|---|---|
| Summer 2026 | Health officials identify a cluster of Legionnaires’ cases on Manhattan’s Upper East Side. |
| During the investigation | Cooling towers at 83 buildings test positive for Legionella; owners ordered to drain, clean and disinfect. |
| July 31, 2026 | The city declares the outbreak over, with 7 deaths reported at the time. |
| Late August 2026 | News reports say the death toll linked to the outbreak rose to 11. |
Questions to ask your doctor
- Could my symptoms be Legionnaires’ disease or another type of pneumonia?
- Should I get a urine antigen test or chest X-ray?
- Which antibiotic are you prescribing, and for how long?
- What warning signs mean I should go to the emergency room?
- When should I follow up if I’m not feeling better?
Recovery: what to expect
Many people start to feel better within a few days of starting antibiotics, but fatigue and cough can linger for weeks. Rest, drink fluids and finish all your medicine. Call your doctor if fever returns or breathing gets worse.
Recommended products
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FAQ
Is the NYC Legionnaires’ outbreak over?
Yes. The city declared the Upper East Side outbreak over on July 31, 2026. Later reports added deaths linked to cases from the outbreak period.
Can you catch Legionnaires’ disease from another person?
It is generally not spread from person to person. People get it by breathing in contaminated water droplets.
How long after exposure do symptoms start?
Usually 2 to 14 days, according to the CDC.
Is tap water safe to drink during an outbreak?
Officials in the 2026 outbreak linked it to cooling towers, not drinking water. Follow your local health department’s guidance.
How is Legionnaires’ disease treated?
With antibiotics. Some patients need hospital care, especially older adults and people with other health problems.
Bottom line
NYC’s 2026 outbreak is over, but Legionnaires’ disease can show up wherever building water systems aren’t maintained. Know the signs: fever, cough and shortness of breath, especially if you are 50 or older or have health conditions. Get care quickly, mention any possible exposure, and keep your own water heater, showers and hot tub well maintained.
Last reviewed: Oct. 26, 2026. This article is general information, not medical advice. Call your doctor or 911 in an emergency.
Sources: CNN (July 31, 2026); ABC7 / AP; Yahoo News; CDC: Legionella; NYC Health Department.
Featured image: Legionella pneumophila bacteria under an electron microscope. Photo: Janice Haney Carr / CDC via Wikimedia Commons, public domain; edited by Nexgen Headlines.
