Legionnaires Disease and Cooling Tower Claims

Can You Sue a Building for Legionnaires' Disease in New York City?

Yes, and New York City is the hardest place in the country for a building owner to defend one of these claims.

Cooling towers here are registered, inspected, sampled on a schedule, and certified annually. Every one of those steps generates a record, and the Health Department publishes its inspection results by address.

As of May 8, 2026, owners must test for Legionella every 31 days while a tower is operating, three times more often than the law required before.

That change came out of a cluster in Central Harlem that infected 118 people and killed seven in the summer of 2025.

What it means for someone who got sick is straightforward. The question of whether a building did what it was supposed to do is answerable from documents that already exist, and the standard it is measured against is now the most demanding in the United States.

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What Changed on May 8, 2026: Monthly Legionella Testing Citywide

New York City has required cooling tower registration and maintenance since a 2015 outbreak in the South Bronx sickened 138 people and killed 16, the largest Legionnaires' cluster in the city's history. That response produced the cooling tower law now codified at Administrative Code § 17-194.1 and the implementing rules in Title 24, Chapter 8 of the Rules of the City of New York.

Ten years later the City tightened it again, and the reason was Harlem.

For anyone made sick by an outbreak after that date, the practical effect is significant. A gap between samples is now measurable against a 31-day rule rather than a 90-day one, which means a lapse that used to be invisible inside a quarterly cycle is now a documented failure.

The Cooling Tower Duties a New York City Building Has to Meet

These obligations are not general standards of care. They are enumerated requirements with dates attached, which is what makes a Legionnaires' case in this city fundamentally different from one anywhere else.

Registration

Every cooling tower must be registered with the Health Department through the city's registration portal. An unregistered tower is a violation before anyone gets sick, and the registry is how the Department knows where to look when a cluster appears.

A Maintenance Program and Plan

Owners must create and follow a written maintenance program and plan complying with elements of ASHRAE Standard 188 plus the additional requirements in the law and rules, covering inspection, cleaning, disinfection, testing, and corrective action. Health Department inspections include a review of that plan and of the operational records kept under it.

Legionella Sampling and Reporting

Sampling must now be conducted monthly, with no more than 31 days between samples, and a building's qualified person must report the date of each sample in the registration portal within five days of collection. Results are reported to the Department, and a positive result triggers required remediation.

Summertime Hyperhalogenation

Each cooling tower system must undergo hyperhalogenation between July 1 and August 31 each year, with water tested for Legionella three to 31 days after the procedure is completed, and a declaration form submitted to the portal within 30 days.

Annual Certification and Inspection

Owners must certify annually, and the Health Department conducts its own routine inspections of tower systems, maintenance plans, and operational records.

Three Years of Records

Building owners must keep records of all cooling tower water maintenance activities for at least three years, including water test results. That retention period is the reason a case filed two years after an infection can still reach the documents that decide it.

Every one of those duties produces a dated artifact. In an ordinary premises case, proving what an owner knew takes months of discovery. Here the sequence of what was required, what was done, and when is largely fixed in a regulatory file before a lawyer is retained.

The Central Harlem Cluster and What the Investigation Showed

The 2025 cluster is worth understanding in detail, because it is the clearest recent picture of how one of these investigations actually unfolds.

The Timeline

The Health Department identified the cluster on July 25, 2025, across five Central Harlem ZIP codes: 10027, 10030, 10035, 10037, and 10039. By August 14 there were 92 diagnosed cases and three deaths, with 15 people hospitalized. The last date anyone in the area began experiencing symptoms was August 9. The Department announced the end of the cluster on August 29, 2025, with a final count of 118 cases, 92 hospitalizations, and seven deaths.

How the Source Was Traced

The Department ran rapid PCR testing on all cooling towers in the investigation area to find traces of Legionella, alive or dead, and required any tower with a positive PCR result to remediate within 24 hours. It then ran culture testing at its Public Health Laboratory, which takes about two weeks to grow and is the standard for confirming bacteria capable of causing illness. Twelve cooling towers at ten buildings tested culture positive, and the Department compared the DNA of bacteria from the towers to the DNA from patient specimens.

Who Is at Risk, and Who Is Not

The Health Department made a point that carries directly into these cases. The risk was not to the people inside the buildings with positive towers. It was to anyone spending time in the neighborhood, because the mist a cooling tower releases carries the bacteria out into the surrounding area.

You do not have to have set foot in the building, and most people we talk to after an outbreak have no idea which building made them sick, and they never went inside it. In a Legionnaires' case the client points at a neighborhood not a specific building. The mist leaves the roof and travels, which means a person who walked to the same subway stop every day has the same claim as somebody who worked in the lobby.

That is the structural feature of one of these cases. The defendant gets identified by genome sequencing rather than by proximity, in an investigation run by a public agency whose findings become the backbone of the civil claim.

How a Legionnaires' Case Is Proved Against a Building Owner

Three evidence sets do the work, and they come from different places.

The Clinical Proof

Diagnosis matters enormously here, because urine antigen testing is common and it is not enough on its own to match a patient to a source. A respiratory culture or a clinical isolate that can be sequenced is what allows a patient's bacteria to be compared to a tower's. Where a patient was treated empirically with antibiotics and never cultured, the case becomes an epidemiological one rather than a genomic one, which is harder but not impossible.

The Public Investigation File

Health Department cooling tower inspection results are published and searchable by building address or building identification number. Beyond that public layer sit the Department's investigation records: PCR and culture results by tower, remediation orders, compliance findings, and the molecular comparison between environmental and clinical isolates.

The Building's Own Records

Registration status, the maintenance program and plan, sampling dates and results, hyperhalogenation declarations, annual certifications, water treatment vendor contracts and service reports, and the three years of maintenance records the rules require. The gaps in that file are the case. A tower with no sample logged for two months during operating season in 2026 has a documented violation of a rule that exists specifically to prevent what happened.

Because the cooling tower rules are local enactments, a violation is generally evidence of negligence rather than negligence as a matter of law. In practice that distinction has limited bite in these cases, because the requirements are so specific that a violation and a failure of reasonable care describe the same conduct.

Who the Defendants Are When a Cooling Tower Makes People Sick

Responsibility for a tower is usually divided among several parties, and each of them carries separate insurance.

The Building Owner

The registration, the maintenance program, the sampling, the certification, and the record keeping are all the owner's duties, and they are not delegable in the sense that hiring a vendor does not end them.

The Property Manager and Operating Entity

Where a management company runs the building's systems and holds the operational records, it is answerable for how those systems were run.

The Water Treatment Vendor

The contractor engaged to sample, dose biocide, clean, and disinfect, along with the laboratory that processed the samples. Vendor service reports frequently show recommendations the owner declined to fund, which is a defendant's own document establishing knowledge.

Public entities appear in this category too. Hospitals, universities, and city agencies operate cooling towers, and a claim against a public defendant runs on a 90-day notice of claim and a one year and 90 day suit deadline instead of three years. Our page on the notice of claim requirement for a public defendant covers which entity requires what, and the answer changes the entire calendar.

 

Legionnaires' Disease Injuries and Long-Term Effects

Legionnaires' is a severe pneumonia caused by breathing in water vapor containing Legionella bacteria. It is not spread person to person, and it responds to antibiotics when it is caught early, which makes the diagnostic delay in many of these cases part of the harm.

• Severe pneumonia and respiratory failure. Frequently requiring hospitalization, supplemental oxygen, intensive care, and mechanical ventilation.
• Septic shock and multi-organ involvement. Including kidney failure requiring dialysis.
• Lasting pulmonary damage. Reduced lung function, exercise intolerance, and chronic shortness of breath that persists long after the infection clears.
• Neurological effects. Confusion during the acute illness, and persistent problems with memory, concentration, and fatigue afterward.
• Cardiac complications. Including myocarditis and endocarditis in a subset of patients.
• Post-intensive care syndrome. The physical deconditioning, cognitive impairment, and psychological effects that follow a long ICU stay.

Risk is concentrated in people 50 and older, current and former smokers, and people with chronic lung disease or weakened immune systems. That demographic reality is sometimes turned into a defense, and it should not be. A building whose negligence releases bacteria into a residential neighborhood does not get credit for the fact that the neighborhood contains older people.

Wrongful Death Claims After a Legionnaires' Outbreak

Seven people died in the Central Harlem cluster, and 16 died in the South Bronx a decade earlier. Fatal outcomes are a defining feature of this hazard rather than an outlier.

A New York wrongful death claim is brought by the personal representative of the estate, which means the family has to be appointed by Surrogate's Court before the case can be filed at all. The claim is measured by pecuniary loss under EPTL § 5-4.3 rather than by grief, and the deadline is two years from the date of death under EPTL § 5-4.1.

Alongside it runs a separate survival claim for the conscious pain and suffering the person experienced before death. In a Legionnaires' death that period is often weeks of documented respiratory failure and intensive care, which makes the survival claim substantial and thoroughly evidenced by the hospital record. Our pages on New York wrongful death claims and survival actions cover how the two run together.

Families in outbreak cases also face a diagnostic problem worth naming. Legionnaires' is frequently recorded as pneumonia of unspecified cause, particularly where no respiratory culture was taken. A death during a known cluster, in a known ZIP code, in a person whose chart says pneumonia, is worth having looked at rather than accepted.

What a Legionnaires' Disease Claim Can Recover in New York

New York does not cap compensatory damages, so recovery tracks the severity of the illness and what it left behind.

• Medical expenses. Emergency care, hospitalization, intensive care, ventilator support, dialysis, rehabilitation, and ongoing pulmonary treatment.
• Lost income and earning capacity. Including the extended absence that follows a long hospitalization and the permanent reduction where lung function does not return.
• Pain and suffering. Covering the acute illness and the lasting respiratory, cognitive, and physical effects.
• Loss of enjoyment of life. The activity, independence, and stamina the illness took.
• Future care. Pulmonary follow-up, oxygen, and home assistance where required.
• Loss of consortium. A spouse's separate claim.
• Wrongful death and survival damages. Pecuniary loss to the family, plus the decedent's own conscious pain and suffering.

Where a building's conduct went beyond ordinary negligence, punitive damages are available in New York. An owner who skipped required sampling through an operating season, ignored a vendor's written recommendations, or continued running a tower after a positive result is the fact pattern that argument rests on.

Why Families Bring Legionnaires' Claims to Lawsuit Legal

Outbreak cases move on a public agency's timeline rather than a client's, and the work that decides them happens while the investigation is still open.

• A New York attorney, not a referral desk. Don Worley has been admitted in New York since 2005 and has spent more than twenty years trying serious injury cases.
• The clinical isolate protected first. Asking the treating hospital to retain the specimen, because a sequenceable isolate is what links a patient to a tower.
• The regulatory file pulled early. Registration, inspection results, sampling history, hyperhalogenation declarations, and certifications, measured against the 31-day rule and the annual requirements.
• Every responsible party identified. Owner, manager, water treatment vendor, and laboratory, with the public-entity notice deadline protected where a hospital, university, or city agency operated the tower.
• Recognition that came from other lawyers. Our attorneys appear in Best Lawyers in America and Super Lawyers, both of which run on peer evaluation, and in the Million Dollar Advocates Forum and the National Trial Lawyers.
• A record across 40,000 cases. More than $100 million recovered, a 98% recovery rate, free consultations 24/7, and no fee unless we win.