Legionnaires’ disease is a severe form of pneumonia caused by breathing in mist contaminated with Legionella bacteria. They occur naturally in fresh water but multiply in warm, stagnant water inside human-made systems. Showers, hot tubs, cooling towers, decorative fountains, sprinklers, ice machines, and large plumbing networks can all produce fine droplets that carry the bacteria deep into the lungs. It does not spread from person to person. That fact matters in liability claims because it means the source is almost always a water system owned or controlled by someone.
When someone gets sick after staying at a hotel, living in an apartment, or using a gym, the legal question is not just whether the bacteria existed. The question is whether the property owner or manager failed to take reasonable steps to control it and whether that failure caused the illness. In premises liability, property owners owe a duty to keep their premises reasonably safe. That duty extends to water systems. A hotel does not have to guarantee that every pipe is sterile. It does have to use accepted methods to prevent Legionella growth, especially when it knows or should know that its water system has risk factors.
Risk factors include water temperatures between 77 and 108 degrees Fahrenheit, stagnant water, scale and biofilm, dead-end pipes, unused guest rooms, and dirty cooling towers. A property with a history of positive tests, previous outbreaks, or complaints about foul-smelling water may have notice of a problem. Notice is important in liability claims. If the owner knew about dangerous conditions and did nothing, the case is stronger. If the owner had no reason to know and followed a reasonable water management plan, the claim is harder.
Causation is often the hardest part. To win a Legionnaires’ disease claim, the injured person must connect their illness to a specific water source. That usually requires evidence from doctors, public health investigators, and environmental engineers. Health departments may test clinical samples and water samples. Laboratories can compare the genetic fingerprint of Legionella found in a patient with the bacteria found in a cooling tower, shower, or hot tub. Without that match, the property can argue the person was exposed somewhere else. It could have been another property or a home water heater. A strong claim uses dates, locations, and laboratory evidence to build a timeline.
Hotels and apartment buildings face claims in different ways. Legionella can take two to fourteen days to cause symptoms, so exposure may have happened elsewhere. An apartment tenant may have been exposed for months in a building with a contaminated water system. A hospital patient may have been exposed while receiving care, which can lead to complex claims involving both premises liability and medical care. In all these settings, the property owner, management company, maintenance contractor, and water treatment vendor may share responsibility.
Property owners should not wait for an outbreak to act. A proper water management plan identifies each water system, maps where water can stagnate, sets control limits, and assigns people to monitor them. Routine tasks include flushing unused outlets, controlling water temperatures, cleaning cooling towers, treating hot tubs, and testing when risks appear. Recordkeeping matters. If a claim is filed, maintenance logs, test results, work orders, and employee training records can show whether the owner acted reasonably or ignored known problems.
For someone who believes they got Legionnaires’ disease from a property, the first step is medical care. Legionnaires’ disease can be fatal, especially for older adults, smokers, and people with weakened immune systems. Next, report the illness to the local or state health department. Health officials can investigate clusters and collect samples before cleanup. Save reservation records, leases, medical bills, test results, and any communication with the property. Do not rely on a property owner to preserve evidence. Water systems can be flushed, cleaned, or altered quickly. An experienced lawyer can send a preservation letter and work with experts to determine whether a claim is viable.
These claims are about responsibility, not panic. Water systems are built, maintained, and controlled by people and companies. When those systems are neglected and someone gets sick, the law may hold the responsible party accountable. The outcome depends on facts, science, and evidence.
