New York Legionnaires’ Disease Outbreaks: 2026 Upper East Side Update and Past Outbreaks

New York City health officials are investigating an active community cluster of Legionnaires’ disease in the Upper East Side neighborhoods of Carnegie Hill and Yorkville. According to the NYC Health Department’s current outbreak page, 59 people had been diagnosed as of July 12, 2026; 15 were currently hospitalized; 33 had been discharged; 11 had not been hospitalized; and no deaths had been reported. The investigation area includes ZIP codes 10028, 10128, and 10075.

People who lived, worked, or visited the affected area since late June and develop cough, fever, shortness of breath, or other pneumonia-like symptoms should contact a health care provider immediately and explain when and where they were in the area. Legionnaires’ disease is treatable, but prompt diagnosis and appropriate antibiotics matter.

No building, cooling tower, or other water system has been publicly confirmed as the outbreak source. NYC has published 31 addresses whose cooling-tower systems returned preliminary PCR-positive results and reported cleaning complete at all 31. Those screening results do not establish that any listed property caused an illness. The city also says this is not a building-plumbing problem and that residents may continue to drink tap water, bathe, shower, cook, and use home or window air conditioners. This page includes a carefully verified building-by-building directory, the current investigation, testing guidance, legal issues, and lessons from prior New York outbreaks.

Pritzker Hageman’s Legionnaires’ disease lawyers investigate exposure timelines, medical testing, environmental evidence, maintenance records, and the parties responsible for unsafe water systems. Call 1-888-377-8900, text 612-261-0856 or contact us online for a free, confidential consultation. You never pay anything unless we win for you.

What is the current Legionnaires’ disease outbreak in New York?

The publicly announced active community investigation addressed on this page is the Upper East Side cluster in Carnegie Hill and Yorkville. As of July 12, 2026, the official count was 59 cases, including 15 people currently hospitalized, 33 discharged, 11 not hospitalized, and no deaths. The affected ZIP codes are 10028, 10128, and 10075. The city began the investigation on July 2 after identifying two nearby cases and has been sampling cooling towers throughout the area.

A “community cluster” means multiple people developed Legionnaires’ disease within a connected place and time. It does not mean that every person who enters the neighborhood will become ill. Most people exposed to Legionella do not develop disease. Risk is higher for adults age 50 and older, people who smoke or vape, and people with chronic illnesses or weakened immune systems.

New York also has sporadic cases, building evaluations, health-care-associated investigations, and other clusters that may not receive the same level of public notice. This consolidated page focuses on the current Upper East Side investigation and provides selected historical context for New York City and the state.

Latest Upper East Side outbreak timeline

July 2, 2026: The city launches the investigation

The NYC Health Department announced two confirmed cases in Carnegie Hill and Yorkville, initially identifying ZIP codes 10028 and 10128. The Department issued a clinician alert, began community outreach, and started sampling all cooling-tower systems in the investigation area. Read the July 2 NYC Health Department announcement.

July 5: ZIP code 10075 and part of the Central Park perimeter are added

After a confirmed case involved a person who lived, worked, or visited ZIP code 10075, the city added that ZIP code to the investigation. The Health Commissioner also advised, out of caution, that people who had visited the east side of Central Park from East 76th Street to East 97th Street should monitor for symptoms. See the July 5 Health Commissioner statement.

July 7: Accelerated remediation and expanded response

The Mayor’s Office reported that more than 100 city staff were involved in the response. Approximately 160 cooling towers were registered within the three ZIP codes, although not all were operating or located inside the final investigation zone. By July 6, staff had sampled 139 towers. The city announced that owners of towers with preliminary positive PCR screening results would be ordered to drain, clean, and disinfect immediately rather than wait for slower culture results. Read the Mayor’s Office response update.

July 12: 59 cases, 15 current hospitalizations, and no deaths

The city’s current public page reported 59 diagnosed cases: 15 people currently hospitalized, 33 discharged, 11 not hospitalized, and no deaths. NYC notes that the numbers are preliminary and subject to change. The “diagnosis date” used in the city’s outbreak reporting is the date the patient’s positive specimen was collected, not necessarily the date symptoms began or the date the result was posted.

July 13: City lists 31 PCR-positive cooling-tower systems and reports cleaning complete

NYC published an address list for 31 cooling-tower systems with preliminary positive PCR screens. The July 13 version placed all 31 under “Cleaning Complete.” The city emphasized that PCR detects genetic material from living or dead Legionella and does not prove that any listed tower contained viable bacteria or caused the outbreak. Culture testing was continuing.

Why the case count may continue to change

Legionnaires’ disease symptoms usually begin 2 to 14 days after exposure, and diagnosis can take additional time. People exposed before a tower was disinfected may not be diagnosed until days later. Health officials may also revise the count as they confirm cases, refine the exposure area, or determine that an illness belongs to a different source. A rising case count after remediation does not, by itself, prove that exposure is continuing.

Who may have been exposed?

The city’s guidance applies to people who have lived, worked, or visited the affected area since late June 2026. A person does not need to reside in one of the three ZIP codes to have a relevant exposure history. Workers, visitors, patients, delivery drivers, building staff, tourists, caregivers, and people who traveled through the area may all have spent meaningful time there.

ZIP codes help health officials organize surveillance and outreach, but they are not physical barriers. Investigators consider where people spent time, when they were there, how long they were present, and how those locations relate to weather, cooling-tower operation, and the symptom-onset window. The city has not announced a single confirmed source or a final exposure boundary.

Anyone who visited the east side of Central Park between East 76th and East 97th Streets during the relevant period should also monitor for symptoms, according to the July 5 city statement.

What people in the affected area should do now

1. Seek medical care promptly if symptoms develop. Call a health care provider immediately for fever, cough, shortness of breath, chest discomfort, confusion, or other pneumonia-like symptoms. Call 911 for severe breathing difficulty, blue or gray lips, new confusion, fainting, or another medical emergency.
2. Tell the provider about the Upper East Side exposure. Give the dates and places where you lived, worked, visited, received care, or spent significant time in Carnegie Hill, Yorkville, ZIP codes 10028, 10128, or 10075, or the identified Central Park perimeter.
3. Ask whether Legionella testing is appropriate. Legionnaires’ disease cannot be reliably distinguished from other pneumonia based only on symptoms or a chest X-ray. A clinician decides which tests are appropriate, but urine antigen testing plus a lower respiratory specimen can provide important information.
4. Follow the city’s current safety guidance. NYC says tap water, normal bathing and showering, cooking, cooling centers, and home or window air conditioning are safe during this community investigation.
5. Write down a detailed exposure timeline. Preserve calendars, phone-location history, transit or rideshare records, work schedules, appointments, receipts, photos, lodging information, and the names of people who were with you.
6. Preserve medical and financial records. Keep test results, discharge paperwork, medication lists, bills, insurance statements, wage-loss records, and communications from employers, buildings, health officials, or insurers.
7. Get legal advice early if Legionnaires’ disease is diagnosed. Cooling towers and water systems can be drained, disinfected, repaired, or altered quickly. Prompt investigation can help identify records, witnesses, contracts, samples, and other evidence before it becomes harder to obtain. See our guide on what to do after contracting Legionnaires’ disease.

Symptoms of Legionnaires’ disease

Legionnaires’ disease is a serious type of pneumonia caused by Legionella bacteria. Symptoms usually begin 2 to 14 days after exposure, although longer intervals can occur. Common symptoms include:

• Cough
• Fever or chills
• Shortness of breath
• Headache
• Muscle aches
• Fatigue or weakness
• Loss of appetite
• Confusion or other changes in mental status
• Diarrhea, nausea, or other gastrointestinal symptoms

Because these symptoms overlap with other respiratory illnesses, a specific diagnostic workup is important. Learn more on our page about Legionnaires’ disease symptoms and diagnosis.

Who is at higher risk of severe illness?

Most healthy people who encounter Legionella do not become ill. The NYC Health Department identifies the following groups as having increased risk:

• Adults age 50 or older
• People who smoke or vape, including former smokers
• People with chronic heart, lung, kidney, or liver disease
• People with diabetes
• People with weakened immune systems because of a medical condition or medication

Risk factors help clinicians decide when to test, but younger people and people without known risk factors can also develop Legionnaires’ disease. No one with compatible symptoms and a relevant exposure history should assume the illness is “just the flu.”

Legionnaires’ disease can be fatal, although most people recover with appropriate treatment. The CDC reports that about one in ten people who become ill die from complications; the estimated fatality rate is higher for infections acquired during a stay in a health-care facility. Those figures describe populations, not the prognosis for any individual patient, and early diagnosis and treatment matter.

How Legionnaires’ disease is diagnosed

A chest X-ray or CT scan can show pneumonia, but imaging does not identify the bacterium that caused it. Legionella-specific testing is needed. The CDC recommends pairing a Legionella urinary antigen test with testing of a lower respiratory specimen by culture or a molecular method when Legionnaires’ disease is suspected.

Urinary antigen test

The urine antigen test is rapid and widely used, but it usually detects only Legionella pneumophila serogroup 1. A negative urine antigen test does not rule out every Legionella species or serogroup. The test also does not produce a bacterial isolate that can be compared with an environmental source.

Lower respiratory PCR or other molecular testing

PCR can detect Legionella genetic material in sputum, a bronchoscopy specimen, a tracheal aspirate, or another lower respiratory sample. Some molecular assays can detect types that a urine antigen test misses and may remain useful after antibiotics begin. Availability and exact test performance vary by laboratory.

Lower respiratory culture

Culture can detect a broader range of Legionella and can yield a living bacterial isolate. That isolate may be compared with Legionella recovered from cooling-tower or plumbing samples. Culture can take up to about 14 days and requires specialized media, so clinicians and laboratories may need to request it specifically. Ideally, a respiratory specimen is collected before antibiotics, but treatment should not be delayed to obtain a sample.

Why a clinical isolate can be so important

Public-health laboratories can use subtyping and whole-genome sequencing to compare bacteria from a patient with bacteria from a suspected water source. A close molecular match, combined with a compatible exposure history and epidemiologic pattern, can be powerful evidence of source attribution. New York’s 2026 clinician advisory emphasizes the importance of respiratory culture for this reason. Read the joint New York State and New York City clinician advisory.

Is it safe to drink tap water, shower, or use air conditioning?

For the current Upper East Side community cluster, NYC says residents may continue to drink tap water, bathe, shower, cook, use cooling centers, and operate home or window air conditioners. The city has stated that the investigation is not about an affected building’s internal plumbing.

A rooftop cooling tower is different from a window air conditioner. Cooling towers recirculate warm water and release mist outdoors. Window units and other systems that do not recirculate water and release mist are not cooling towers and do not create the same Legionella risk.

Public guidance can differ in a building-specific cluster. When two or more cases are associated with the same building and shared hot-water system, NYC may evaluate the building’s plumbing, and residents may receive tailored instructions. Always follow the latest health-department notice for your particular location.

Why are cooling towers the focus of the Upper East Side investigation?

Community clusters can occur when a contaminated cooling tower releases aerosolized water droplets into the outdoor air. Cooling towers are commonly part of large air-conditioning, refrigeration, or industrial systems. They remove heat through evaporation, leaving warm recirculating water that can support bacterial growth if control measures are ineffective.

Legionella can multiply when water is warm, flow is poor, disinfectant levels are inadequate, or biofilm, scale, corrosion, and sediment protect bacteria from treatment. Fans can then carry contaminated mist beyond the rooftop. People become ill when they inhale droplets containing enough bacteria to reach the lungs.

The fact that cooling towers are being tested does not mean every tower is unsafe or that every positive environmental result identifies the outbreak source. Learn more about where Legionnaires’ disease comes from and the different water systems that can create exposure.

What is New York City doing to investigate the source?

The city’s response has included epidemiologic interviews, clinician alerts, case surveillance, community outreach, cooling-tower sampling, rapid PCR screening, culture testing, inspection, remediation orders, and laboratory comparison of patient and environmental specimens. The Upper East Side has a high concentration of registered towers, which makes prioritization and laboratory capacity especially important.

The Mayor’s Office reported that the Health Department had sampled 139 of approximately 160 registered towers in the three ZIP codes by July 6, while noting that not every registered tower was operating or inside the final investigation zone. Towers with a preliminary positive PCR screen were ordered to undergo immediate draining, cleaning, and disinfection.

By July 13, NYC had published a list of 31 buildings whose cooling-tower systems tested positive in preliminary PCR screening. The city’s updated list showed cleaning complete at all 31 locations. See the NYC Health Department’s July 13 PCR-positive cooling-tower list. These preliminary results do not establish that any listed tower caused the outbreak; culture testing is being conducted to determine whether live Legionella was present when samples were collected. The directory below preserves each official city address and adds a conservative public identification of the property where one could be verified.

Immediate remediation is a protective step. It does not establish that a tower caused any patient’s illness. The city must still evaluate culture results, Legionella type, patient locations and timing, and, when clinical isolates are available, molecular relatedness between patient and environmental bacteria.

Which Upper East Side buildings had preliminary PCR-positive cooling-tower results?

On July 13, 2026, the NYC Health Department identified 31 addresses in the Carnegie Hill and Yorkville investigation zone where cooling-tower systems had returned preliminary PCR-positive results. All 31 were listed as having completed cleaning and disinfection. The directory is organized by corridor so residents, workers, visitors, clinicians, and investigators can compare the addresses with a personal exposure timeline.

A property’s presence on this list does not mean it caused the outbreak, that live Legionella was found, that anyone was exposed inside the building, or that the owner did anything wrong. PCR can detect DNA from living or dead bacteria. NYC has stated that there is no additional risk from being inside the listed buildings and that the current investigation does not implicate their internal plumbing or tap water.

East End Avenue, York Avenue, Second Avenue, and Third Avenue

Official NYC address	Public identification	Property details for identification
180 East End Avenue	Gracie Towers	Postwar residential cooperative overlooking Carl Schurz Park and the East River.
1750 York Avenue	Asphalt Green Upper East Side campus	Nonprofit sports, aquatics, fitness, and recreation campus. NYC’s cooling-tower list uses 1750 York Avenue; the campus commonly publishes 555 East 90th Street as its visitor address.
1660 Second Avenue	Yorkshire Towers	Large postwar residential rental complex at Second Avenue and East 86th Street, completed in the 1960s.
1875 Second Avenue	1875 Second Avenue	Four-story commercial property in Yorkville completed in 2015; no consistently used public building name was located.
1438 Third Avenue	Maison East	Residential condominium tower formerly known as Turnberry Tower and later converted and marketed as Maison East.
1511 Third Avenue	Yorkville Bank Building	Landmarked early-20th-century commercial building, originally constructed for the Yorkville Bank and later expanded.
1551 Third Avenue	Whole Foods Market – Upper East Side	Commercial retail property occupied by the Whole Foods Market Upper East Side store.

Fifth Avenue and East 78th through East 85th Streets

Official NYC address	Public identification	Property details for identification
1110 Fifth Avenue	Official address only	NYC’s list uses this exact address. Public property sources do not consistently identify a distinct named building at 1110 Fifth Avenue, so no building name is assigned here.
1001 Fifth Avenue	1001 Fifth Avenue	Philip Johnson-designed postmodern residential cooperative opposite The Metropolitan Museum of Art.
1071 Fifth Avenue	Solomon R. Guggenheim Museum	Frank Lloyd Wright-designed art museum on Museum Mile, opened in 1959.
1080 Fifth Avenue	1080 Fifth Avenue	Postwar residential cooperative facing Central Park, completed around 1960-1961.
153 East 78th Street	153 East 78th Street	Small Lenox Hill residential rental building; public listings identify four floors and approximately 15 apartments.
135 East 79th Street	135 East 79th Street	Boutique luxury residential condominium designed by William Sofield, with approximately 31 residences.
300 East 79th Street	300 East Seventy-Nine	Residential condominium near Second Avenue, commonly marketed as 300 East Seventy-Nine or 300 East 79th Street.
238 East 81st Street	Rockefeller University housing	University residential building with 11 stories and 21 apartments for members of the Rockefeller community.
240 East 82nd Street	240 East 82nd Street	Large postwar residential rental building; public property sources identify approximately 20 stories and 177 apartments.
8 East 83rd Street	8 East 83rd Street	Full-service residential cooperative between Fifth and Madison Avenues, near Central Park and The Metropolitan Museum of Art.
145 East 84th Street	145 East 84th Street	Postwar residential cooperative, publicly identified as a 16-story building completed in the early 1960s.
160 East 84th Street	160 East 84th Street	Postwar residential rental building near Third Avenue, publicly identified as a 21-story property completed in the early 1960s.
114 East 85th Street	Ramaz Middle School	The Rabbi Haskel Lookstein Middle School of Ramaz, located in the Benjamin & Esther Gottesman Education Center.
117 East 85th Street	Official address only	Public property databases conflict on this property’s classification, age, and size. The city’s exact address is retained without assigning a common building name.

East 87th through East 95th Streets

Official NYC address	Public identification	Property details for identification
120 East 87th Street	Park Avenue Court	Residential condominium converted from the former Gimbels East department store building.
125 East 87th Street	The Sherry House	Postwar residential rental building commonly known as The Sherry House.
152 East 87th Street	The Alyn	Luxury residential rental building completed in the late 2010s.
501 East 87th Street	Rivers Bend	Large residential rental building near the East River and Carl Schurz Park.
160 East 88th Street	Lexington Towers	Postwar residential rental building near Lexington Avenue.
168 East 88th Street	Address associated with 170 East 88th Street	NYC’s list uses 168 East 88th Street. Public residential listings commonly associate this address with the cooperative marketed as 170 East 88th Street; the official city address is preserved here.
401 East 88th Street	401 East 88th Street	Postwar residential rental building at First Avenue; public sources identify approximately 16 floors and 205 apartments.
333 East 91st Street	Azure	Residential tower in a mixed-use development that also includes New York City public-school space, including MS 114.
354 East 91st Street	The Cole by Stonehenge	Residential rental tower currently marketed as The Cole and previously known as Electra.
312 East 95th Street	Trevor Day School Middle/Upper School	Trevor Day School’s campus for grades 6 through 12, between First and Second Avenues.

What this list can and cannot tell you. The addresses can help a patient reconstruct where they lived, worked, visited, attended school, exercised, shopped, or received services during the exposure window. They cannot, by themselves, identify the source of a person’s infection. Source attribution still requires viable environmental culture results, patient-specific exposure evidence, the timing and geography of cases, and—when available—comparison of clinical and environmental isolates.

A positive PCR result is not the same as proving the outbreak source

PCR is useful because it can quickly screen many environmental samples and identify towers that need urgent attention. It detects Legionella DNA, however, and does not by itself show that the detected bacteria were alive, aerosolized in a way that reached patients, or genetically related to the bacteria that caused a particular person’s pneumonia.

Culture can show viable Legionella and produce an isolate for additional analysis. Whole-genome sequencing can compare a patient isolate with environmental isolates at high resolution. Even a molecular match is considered together with the exposure timeline, geography, weather, and other epidemiologic evidence. The CDC’s outbreak-testing guidance explains why PCR is generally used to screen and prioritize environmental samples for culture and why comparing clinical and environmental isolates matters.

This distinction protects both public health and accuracy. An investigation may find several towers with Legionella, but only one or two may match patient specimens. In other outbreaks, no source is conclusively identified because a clinical isolate was not obtained, environmental bacteria were removed before sampling, or the evidence remained inconclusive.

How investigators determine whether a case belongs to the outbreak

Health officials generally combine several lines of evidence:

• Clinical evidence: pneumonia plus a laboratory result confirming Legionella infection
• Time: symptom onset and specimen-collection dates consistent with the likely exposure period
• Place: residence, work, visits, medical care, travel routes, and time spent in the investigation area
• Epidemiology: whether cases cluster around common locations, dates, and potential sources
• Environmental testing: Legionella PCR and culture results from cooling towers or other water systems
• Molecular evidence: comparison of patient and environmental isolates by serogrouping, sequence-based typing, or whole-genome sequencing
• Alternative explanations: travel, health-care exposure, hot tubs, another building water system, or a separate sporadic source

A patient’s home address is only one part of the analysis. Investigators may identify a worker or visitor as part of a community cluster when the person’s location and timing fit the pattern. Conversely, a person who lives in the affected ZIP code may have acquired the infection elsewhere.

New York City cooling-tower rules in effect in 2026

New York City enacted cooling-tower requirements after the deadly 2015 South Bronx outbreak and strengthened them after the 2025 Central Harlem outbreak. Effective May 8, 2026, NYC requires Legionella sampling at least every 31 days while a tower is operating, replacing the prior 90-day sampling interval. Compliance inspections are required every 90 days. The city reports about 5,000 registered cooling-tower systems across roughly 4,000 buildings. The NYC Health Department’s 2026 rule announcement explains the strengthened testing and inspection program.

Owners must register systems, maintain and implement a Maintenance Program and Plan, monitor water quality, use appropriate treatment, respond to abnormal conditions and test results, and keep records. NYC requires at least three years of records covering routine monitoring, maintenance, inspections, corrective actions, water treatment, water-quality measurements, Legionella test results, cleaning, and disinfection. See the NYC cooling-tower registration and maintenance requirements.

The Health Department’s cooling-tower inspection lookup can be searched by address or Building Identification Number. The city cautions that posted inspection information may lag because of data review and hearing outcomes. A clean or older inspection record does not necessarily answer what happened during a later outbreak period; operational logs, treatment records, alarms, sampling results, and remediation history may be more probative.

New York State requirements outside New York City

New York State’s Part 4 regulations establish requirements for cooling towers and covered health-care facilities. The rules address registration, maintenance programs, Legionella sampling, corrective action, notification, and recordkeeping. Within New York City, owners must comply with applicable state and city requirements. Outside the city, state rules and local health-department oversight remain central. Review 10 NYCRR Part 4 – Protection Against Legionella.

What cooling-tower records can reveal

A well-run cooling tower generates a detailed operational history. In a public-health or legal investigation, relevant material may include:

• The registered owner, operator, and responsible building personnel
• The Maintenance Program and Plan and revisions in effect during the exposure period
• Daily or routine measurements, including temperature, pH, conductivity, disinfectant levels, and make-up water data
• Biocide type, dosage, feed records, and interruptions
• Legionella sampling dates, laboratory methods, species or serogroup results, and colony counts
• Microbiological indicator results and responses to elevated levels
• Alarms, control-system data, service tickets, and equipment failures
• Start-up, shutdown, idle-period, heat-wave, and seasonal operating procedures
• Cleaning, disinfection, emergency remediation, and validation records
• Compliance inspection reports, violations, notices, and corrective actions
• Contracts and communications among owners, managers, water-treatment vendors, laboratories, engineers, and maintenance companies

Testing is a snapshot. A negative result in one month does not prove that conditions remained controlled every day, and a later positive result does not automatically reveal when growth began. Trends, deviations, and the response to warning signs often matter more than a single data point.

Conditions that can allow Legionella to grow or spread

The following are examples of issues investigators may evaluate. Their inclusion does not mean any one occurred in the current Upper East Side outbreak:

• Warm, stagnant, or slowly moving water
• Inadequate disinfectant residual or unreliable chemical feed
• Biofilm, scale, sediment, corrosion, or organic material
• Poorly managed start-up after shutdown or low-use periods
• Dead legs, bypasses, leaks, or equipment that prevents uniform treatment
• Failure to monitor at required frequencies or act on abnormal readings
• Delayed response to positive test results, alarms, complaints, or illness reports
• Inadequate cleaning, disinfection, verification, or follow-up sampling
• Poor drift control or mechanical conditions that increase mist release
• Incomplete records or unclear division of responsibility among contractors and owners

Can a person affected by the Upper East Side outbreak bring a lawsuit?

A person diagnosed with Legionnaires’ disease may have a claim if the evidence shows that a negligently managed cooling tower or other water system caused the infection. Being present in the affected ZIP codes and receiving a diagnosis are important facts, but they do not automatically establish legal causation or fault.

A case evaluation typically asks:

• Was the person’s Legionnaires’ disease confirmed by an appropriate laboratory test?
• Does the symptom-onset period fit time spent near the suspected source?
• What other possible exposure sources existed during the incubation period?
• Did public-health findings, environmental cultures, or molecular testing identify a likely source?
• Who owned, operated, maintained, treated, inspected, or controlled that source?
• Were regulations, maintenance plans, industry practices, contracts, or warning signs disregarded?
• What medical, economic, and personal losses resulted from the illness?

A source does not always need to be proved by a perfect DNA match, but strong cases usually rely on multiple consistent forms of evidence. Our page on the five steps we take to prove a Legionnaires’ disease case explains how medical, epidemiologic, environmental, and operational evidence fit together.

Who could be legally responsible?

Depending on the evidence, potentially responsible parties may include:

• A building or property owner
• A property manager or facility operator
• A tenant or business that controlled the cooling-tower system
• A cooling-tower service or maintenance company
• A water-treatment contractor
• An engineering, commissioning, or consulting firm
• A laboratory or inspection provider, when its conduct contributed to a missed danger
• A construction contractor or entity responsible for a temporary tower
• A public entity, if it owned or operated the source and applicable law permits a claim

Responsibility may be divided among several companies. Contracts can assign day-to-day tasks, but they do not always eliminate an owner’s or operator’s legal duties. Claims involving a government entity may have separate notice and procedural requirements, making prompt legal advice especially important. Learn more about determining liability in a Legionnaires’ disease outbreak.

What compensation may be available?

Compensation depends on the facts, applicable law, and the severity and duration of the illness. Recoverable losses may include:

• Emergency care, hospitalization, intensive care, medication, rehabilitation, and follow-up medical expenses
• Future medical care and monitoring related to lasting complications
• Lost wages and reduced earning capacity
• Pain, breathing difficulty, physical limitations, and loss of normal activities
• Emotional distress and the effects of a frightening hospitalization
• Travel, caregiving, household services, and other out-of-pocket costs
• Losses experienced by a spouse or family, where allowed by law
• Wrongful-death damages when an infection causes a death

Learn more about Legionnaires’ disease lawsuits and compensation, review our Legionnaires’ disease settlement information, and see our page on Legionnaires’ disease wrongful-death claims.

Evidence patients and families should preserve

You should not attempt to collect water samples from a suspected cooling tower or building system yourself. Environmental sampling must be planned, documented, and performed safely. Patients and families can preserve other evidence that may be difficult to reconstruct later:

• A day-by-day timeline for the 14 days before symptoms began
• Home, work, medical, hotel, restaurant, shopping, recreation, and transit locations
• Phone-location data, maps, calendars, photos, receipts, credit-card records, and transit or rideshare history
• Work schedules, timecards, building-access records, delivery routes, or appointment confirmations
• All medical records, test results, imaging, medication lists, and discharge instructions
• The name of the laboratory and the type of Legionella test performed
• Information about whether a lower respiratory specimen or isolate was retained
• Health-department questionnaires, case numbers, and communications
• Building notices, emails, text messages, press releases, and screenshots of changing public updates
• Medical bills, insurance explanations of benefits, wage-loss proof, and caregiving expenses
• Names and contact information for coworkers, family members, or others who can confirm locations and symptoms

How Pritzker Hageman investigates Legionnaires’ disease cases

Legionnaires’ disease cases require a coordinated investigation across medicine, epidemiology, microbiology, building systems, water treatment, regulation, and law. Pritzker Hageman’s national Legionnaires’ disease team has represented patients and families in cases involving cooling towers, hotels, hospitals, long-term-care facilities, apartment buildings, workplaces, and other complex water systems.

Our work may include:

• Reviewing diagnostic tests, hospitalization records, and the clinical course
• Building a precise exposure and symptom-onset timeline
• Coordinating with public-health information and independent experts
• Identifying the owner, operator, contractors, and others who controlled the suspected source
• Seeking maintenance plans, treatment logs, testing data, contracts, inspections, and communications
• Evaluating whether the illness fits the known outbreak or another source
• Preserving evidence and pursuing additional testing when appropriate and lawful
• Calculating medical, financial, occupational, and family losses
• Handling communications with insurers and defendants so the client can focus on recovery

We understand that a source investigation may still be open when a patient first calls. Early contact allows us to begin preserving information without overstating what public-health officials have not yet concluded. Visit our Legionnaires’ disease legal practice page or contact Pritzker Hageman for a free case review.

Selected past Legionnaires’ disease outbreaks in New York

New York’s outbreak history includes community cooling-tower clusters, building hot-water clusters, and health-care or senior-living outbreaks. The examples below are selected, not exhaustive. Counts can change after an investigation closes, and different agencies may use different reporting cutoffs.

Outbreak	Reported impact	Source or investigation finding
2025 Central Harlem	118 cases; 92 hospitalized; 7 deaths	Community outbreak. Patient isolates matched cooling towers at Harlem Hospital and 40 West 137th Street.
2025 Parkchester North	At least 4 cases	Building cluster. The building hot-water system was identified as the source.
2025 Westchester County	At least 37 cases; 2 deaths	Countywide increase. Public reporting did not identify one common source for all cases.
2024 Albany senior living	20 hospitalized; 4 deaths	Long-term-care outbreak at Peregrine Senior Living.
2022 Highbridge, Bronx	30 cases; 28 hospitalized; 2 deaths	Patient isolates matched a cooling tower at 1325 Jerome Avenue.
2021 Central Harlem	18 cases; all hospitalized; 0 deaths	A patient isolate matched a cooling tower at NYC Health + Hospitals/Harlem.
2018 Lower Washington Heights	More than 50 sick; 2 deaths	Linked to a building cooling-tower system; NYC found that not all system components were properly maintained.
2015 South Bronx	138 cases; 128 hospitalized; 16 deaths	Patient and environmental isolates linked the outbreak to the Opera House Hotel cooling tower.

2025 Central Harlem community outbreak: 118 cases, 92 hospitalizations, 7 deaths

The 2025 Central Harlem cluster became one of New York City’s largest recent outbreaks. NYC’s final retrospective count was 118 cases, 92 hospitalizations, and seven deaths. During the investigation, multiple towers tested culture-positive for live Legionella. The city ultimately reported a molecular match between patient isolates and Legionella from cooling towers at Harlem Hospital, 506 Lenox Avenue, and a construction site at 40 West 137th Street; seven patient specimens were available for comparison.

The outbreak led to increased staffing and stronger city rules, including Legionella sampling at least every 31 days while towers operate. Read our Central Harlem outbreak coverage and the NYC Health Department’s investigation closure.

2025 Parkchester North building cluster: a hot-water-system source

At least four Parkchester North Condominium residents were reported with Legionnaires’ disease. Unlike a community cooling-tower cluster, NYC identified the building’s hot-water system as the source, according to the public-health information summarized in our Parkchester North outbreak report. This distinction matters: a building-plumbing cluster generally creates risk for people using that building’s water, not the surrounding neighborhood.

2025 Westchester County increase: 37 cases and 2 deaths reported

Westchester County reported an increase that included at least 37 cases and two deaths. Public reporting did not identify one confirmed common source for all cases. A countywide rise can involve sporadic cases, separate buildings, health-care exposures, travel, or more than one environmental source. Read our Westchester Legionnaires’ disease update.

2024 Peregrine Senior Living in Albany: 20 hospitalizations and 4 deaths

An outbreak at Peregrine Senior Living in Albany hospitalized 20 people and caused four deaths, according to state-official information reported at the time. Long-term-care settings require particular attention because residents may have age, lung disease, immune suppression, or other conditions that increase the risk of severe illness. Read our Peregrine Senior Living outbreak coverage.

2022 Highbridge, Bronx: 30 cases, 28 hospitalizations, 2 deaths

NYC closed the Highbridge investigation with 30 cases, 28 hospitalizations, and two deaths. The Health Department matched Legionella from a cooling tower at 1325 Jerome Avenue with isolates from two patients. The owner was ordered to disinfect and perform additional remediation. See the NYC Highbridge investigation findings.

2021 Central Harlem: 18 cases, all hospitalized, no deaths

The 2021 Central Harlem community cluster involved 18 cases; all 18 people were hospitalized and no deaths were reported. NYC matched bacteria from a patient specimen to a cooling tower at NYC Health + Hospitals/Harlem. The cluster shows how obtaining even one suitable clinical isolate can materially strengthen a source investigation. See the NYC 2021 Central Harlem closure report.

2018 Lower Washington Heights: more than 50 illnesses and 2 deaths

NYC reported that more than 50 people became ill and two died in a 2018 outbreak linked to a building cooling-tower system in Lower Washington Heights. The investigation found that not all parts of the system had been properly maintained. The city highlighted dead legs, biofilm, sediment, and the need to clean and treat every wet component of a cooling-tower system – not only the visible tower – in its cooling-tower lessons bulletin.

2015 South Bronx: 138 cases, 128 hospitalizations, 16 deaths

The 2015 South Bronx outbreak was one of the largest and deadliest Legionnaires’ disease outbreaks in U.S. history. Investigators linked 138 cases and 16 deaths to a hotel cooling tower; 128 patients were hospitalized. Environmental and clinical isolates were analyzed with molecular methods, including whole-genome sequencing. The outbreak drove New York City’s first comprehensive cooling-tower law. Read the CDC Emerging Infectious Diseases investigation.

What New York’s past outbreaks teach

1. A preliminary positive tower is a lead, not a final source conclusion

Large investigations often find Legionella in more than one tower. Patient-location patterns, viable cultures, bacterial type, and molecular comparisons help distinguish the tower that merely contained Legionella from the source most likely to have caused illness.

2. Clinical respiratory specimens can determine whether a source can be confirmed

In 2025 Central Harlem, the city received seven clinical specimens and matched the outbreak strain to two locations. In 2021 Central Harlem, one patient specimen matched a tower. When patients are diagnosed only by urine antigen, the diagnosis may be valid, but investigators do not receive an isolate for source comparison.

3. Community and building clusters require different public guidance

Community cooling-tower outbreaks can affect people who live, work, or visit an outdoor area. Building hot-water clusters usually affect residents, patients, guests, or staff who use that building’s plumbing. Clear communication prevents unnecessary fear while protecting the people at actual risk.

4. Compliance on paper is not the end of the inquiry

A tower can have a maintenance plan and still experience an operational failure, an unexpected treatment interruption, or conditions that allow bacterial growth. Investigators examine what was actually done, measured, observed, and documented during the relevant period.

5. Fast public-health action and careful source proof serve different purposes

Officials may order immediate disinfection based on a preliminary screen to reduce risk. A later scientific and legal analysis requires more: viable culture, isolate comparison, exposure timing, source operation, maintenance history, and alternative-source analysis.

Legionnaires’ disease burden in New York

A June 2026 joint New York State and New York City clinician advisory reported that statewide legionellosis incidence rose sharply in 2025 to 6.1 cases per 100,000 people after remaining relatively stable from 2022 through 2024. The highest burden was among residents of New York City and counties in Western New York. In 2025, state and city agencies investigated 33 community-acquired and 107 health-care-facility-associated clusters or outbreaks.

New York City’s 2019-2022 surveillance report notes that the city has recorded roughly 200 to 700 diagnosed cases per year. It also documented unequal burden: non-Latino Black New Yorkers had the highest rate among racial and ethnic groups, and most diagnosed people in 2019-2022 lived in the Bronx. The report discusses building conditions, neighborhood infrastructure, testing differences, poverty, and structural racism as factors relevant to understanding disparities. Read the NYC Legionnaires’ disease surveillance report.

These data underscore that prevention is not limited to emergency remediation. Routine water management, transparent oversight, clinician testing, clinical-specimen collection, and timely public communication all affect whether cases are prevented, recognized, and linked to a source.

Frequently asked questions about the New York outbreak

Contact Pritzker Hageman about a New York Legionnaires’ disease case

If you or a loved one was diagnosed with Legionnaires’ disease after living, working, receiving care, or visiting the Upper East Side investigation area – or after another New York exposure – Pritzker Hageman can review what happened. Our team understands the medical testing, cooling-tower and plumbing evidence, public-health process, and preservation work these cases require.

Call 1-888-377-8900, text 612-261-0856, or contact our Legionnaires’ disease legal team online for a free, confidential consultation. We are not paid unless we win for you.

Official sources and further reading

• NYC Health Department: current Legionnaires’ disease outbreak page
• NYC Health Department: July 2 Upper East Side cluster announcement
• NYC Health Commissioner: July 5 Upper East Side investigation statement
• NYC Mayor’s Office: accelerated Upper East Side response
• NYC Health Department: July 13 list of PCR-positive cooling-tower systems
• NYC Health Department: cooling-tower registration, maintenance, and 2026 requirements
• NYC Health Department: 2026 strengthened cooling-tower testing and inspection rules
• NYC Health Department: cooling-tower inspection results
• New York State and New York City: 2026 legionellosis advisory for clinicians
• New York Codes, Rules and Regulations: Part 4 – Protection Against Legionella
• CDC: About Legionnaires’ disease
• CDC: Laboratory testing for Legionella
• CDC: Methods for Legionella testing and specimen collection during investigations
• NYC: 2019-2022 Legionnaires’ disease surveillance report
• NYC: 2025 Central Harlem investigation closure
• NYC: 2022 Highbridge investigation closure
• NYC: 2018 Lower Washington Heights cooling-tower lessons bulletin
• CDC Emerging Infectious Diseases: 2015 South Bronx outbreak investigation

Additional Pritzker Hageman Legionnaires’ disease resources

• Legionnaires’ disease lawyers and lawsuits
• Legionnaires’ disease symptoms and diagnosis
• Where Legionnaires’ disease comes from
• What to do if you contract Legionnaires’ disease
• How we prove a Legionnaires’ disease case
• Determining liability for an outbreak
• Lawsuits and compensation
• Wrongful-death lawsuits
• Frequently asked questions
• Recent Legionnaires’ disease news and outbreak posts