How does legionella get in water. Legionnaires' Disease in Communities & Healthcare Facilities Legionnaires' Disease in Communities & Healthcare Facilities is also available in Portable Document Format What is Legionella? Legionella is a type of bacteria that can cause an illness called legionellosis, commonly known as Legionnaires’ disease. Where do Legionella bacteria come from? Legionella bacteria are found naturally in the environment, usually in water. When this occurs, this allows the Legionella to grow. Legionnaires' disease is treatable with antibiotics. The guide looks at the formation of scale in water systems, fittings and appliances and how it can encourage the Learning how to prevent it is key to keeping your air cool and safe. . When water is stagnant, hot water temperatures can decrease to the Legionella growth range (77°–113°F, 25°–42°C). Learn about growth conditions. People may be exposed to these Legionnaire’s disease is a type of pneumonia caused by Legionella bacteria. Outbreaks of legionellosis have occurred when people breathed in mists from a water source contaminated with Legionella. Legionella is a genus of gram-negative bacteria that can be seen using a silver stain or grown in a special media that contains cysteine, an amino acid. , cooling towers, hot tubs, building water systems). Legionella has qualities that make it different from other bacteria cells. Legionnaires’ disease outbreaks happen when a lot of people breathe in water droplets from one of these sources. Can You Get Legionnaires’ Disease from a Shower? Can you get Legionnaires’ disease from a shower? It’s a question our Legionella experts are asked regularly, and the answer might surprise you. 3 4. Can grow in building water systems Legionella can pose a health risk when it gets into building water systems and certain other devices. Homeowners What Is It? Legionella pneumophila (L. Where has Legionella been found? Legionella bacteria are found naturally in the environment Jan 3, 2025 · Lower water temperature: Operate cooling tower systems at the lowest possible water temperature. Normally, secretions Dec 23, 2016 · The public health threat of Legionnaires’ disease can be reduced by regular maintenance, cleaning and disinfection of water and air conditioning systems to minimize the growth of the legionella bacterium. However, new evidence suggests that another way of contracting Legionella is more common. It’s in the pipework. People may be exposed to these mists in homes, workplaces, hospitals, or public places. Less commonly, people can catch the infection by accidentally getting water into the lungs while drinking, also known as aspiration. Legionella exists naturally in fresh water and moist soil, but grows best in warm Oct 3, 2023 · How Does Legionella Get Into A Home’s Water Supply? Legionella can enter a home’s water supply in several ways. Certain people are at increased risk for this infection. Outbreaks of legionellosis—Legionella-caused illness—are not uncommon, especially in spas and hotels. One type of Legionella species (L. Heating, storing, and filtering in some buildings can reduce the amount of available disinfectant without people realising. Jun 20, 2023 · Learn how to kill Legionella bacteria properly with tips from specialists. Currently, six guests have been treated for Legionnaires’ disease from this outbreak. It can make people sick when it grows in manmade water systems such hot tubs, cooling towers, large plumbing systems, and decorative fountains. The bacteria grow best in warm water, like the kind found in hot tubs, cooling towers, hot water tanks, large plumbing systems, or parts of the air Maintaining Healthy Building Water Systems Prevents Disease Building owners and managers can protect people by developing a water management program. Symptoms include high fever, cough, diarrhea and confusion. Hot water heater tanks, shower heads, hot water taps and pipework can breed Legionella bacteria. But legionella bacteria can grow in water systems made by humans, such as air conditioners. People at increased risk for Legionnaires' disease may need to be informed and want to take precautions if their building tests positive for Legionella. It poses a significant health risk. Electric water heaters are more susceptible to Legionella growth because of the ≈25°C lower temperatures at the tank bottom. Aug 2, 2023 · How Does Legionnaires’ Disease Spread? People can get Legionnaires’ disease when they breathe in small droplets of water in the air that have Legionella bacteria in them. Jul 4, 2024 · A water heater's set temperature may impact the likelihood of Legionella bacteria in the distribution system. For this reason, it can be difficult to avoid breathing in water droplets containing Legionella. While it naturally occurs in the environment, the danger arises when Legionella is allowed to grow and spread unchecked within How do people contract Legionella? The most popular theory is that the organism is aerosolized in water and people inhale the droplets containing Legionella. Legionella generally does not pose a health risk if a person drinks the Feb 6, 2023 · Legionella is a type of bacteria found naturally in freshwater environments, but it can be found in the water systems of buildings. People can get Legionnaires' disease or Pontiac fever when they inhale (breathe in) those small droplets containing the bacteria. Jul 28, 2025 · If Legionella is found in the water, can we still use fixtures? If so, why is that considered acceptable, as it seems counterintuitive? Despite the presence of Legionella, people can still use fixtures without ill effects, This is a common practice in high-risk facilities, such as hospitals and nursing homes, according to public health guidance. Recently, partly motivated by increased incidence, many questions have arisen regarding Legionella transmission in the built environment and interventions Feb 6, 2023 · When it comes to understanding how long it takes for Legionella to develop in water, it is an important question to ask. Stagnant water can also lead to low or undetectable levels of disinfectant, such as chlorine Legionella is a dangerous bacteria that thrives and multiplies in water where temperatures are between 68 and 113 degrees Fahrenheit. Legionella only poses a health risk when growth occurs in warm stagnant water, the water is aerosolized, and the small droplets are inhaled. Although Legionella can cause serious infections in people who are at high risk for lung infections, most healthy people who are exposed to Legionella don’t get sick. We’re talking about biofilm. How Legionella affects building water systems and people 1. Legionella bacteria occurs naturally in freshwater environments, like lakes and streams. This report explores the process of transmission via water systems, quantification, prevention and control, and policy and training issues that affect the incidence of Legionnaires' disease. It can harbour bacteria, including Legionella bacteria that can lead to Legionnaires’ disease, along with many other potentially dangerous waterborne pathogens. Aug 27, 2025 · Legionella is a type of bacteria that is found naturally in lakes, streams, ponds, other freshwater settings, and in some soils. When the bacteria are aerosolized and inhaled they can cause infections with symptoms of an atypical pneumonia. Next, water containing Legionella is aerosolized through devices. Apr 18, 2024 · Wondering how to get rid of Legionella bacteria in water or your shower? Read our expert guide online today. Cooling towers have long been thought to be a major source for Legionella, but new data suggest that this is an overemphasized mode of transmission. It is known to cause legionellosis [3] (all illnesses caused by Legionella) including a pneumonia-type illness called Legionnaires' disease and a mild flu-like illness called Pontiac fever. It comes from the Legionella bacteria. People can get sick if they breathe in small water droplets that contain the bacteria. Internal and external factors can lead to Legionella growth in building water systems. Legionella contamination in air conditioners & heat pumps: This article explains cause, hazards, & prevention of Legionella bacteria contamination in air conditioners, how to clean air conditioning systems, Legionnaire's disease prevention & cleaning suggestions for air conditioning equipment and condensate trays, including condensate piping, traps, drains, condensate pumps, and concerns for Read about companies that saved money and reduced environmental waste by switching to Culligan Quench. Building and healthcare facility managers, reduce the risk for growth and spread of Legionella in your building water system with these tips. 2-15 ppm (Nguyen et al. Generally, the low amounts of these bacteria in freshwater do not lead to disease. See full list on safeplumbing. You get the infection by breathing in droplets of water which contain legionella germs (bacteria) from contaminated water systems. Legionella can adversely impact public health. This article explores how Legionella bacteria spread inside water systems and what conditions make their proliferation more likely. This temperature range is often found in building water Legionnaires' disease is a form of atypical pneumonia caused by any species of Legionella bacteria, [3] quite often Legionella pneumophila. Wondering how long it takes to receive Legionella test results? Read this guide to find out the typical turnaround time for getting your results. 0-8. Mar 15, 2024 · Legionella, the bacterium that causes Legionnaires' disease, occurs natu rally in freshwater environments, like lakes and streams. While most domestic showers pose little risk, under certain conditions, they can become breeding grounds for harmful Legionella bacteria. [2] Nausea, vomiting, and diarrhea may also occur. Plus, download how-to guides, information sheets, white papers, and more. What is biofilm? Biofilm is a collection of inorganic Oct 9, 2023 · Can you be exposed to Legionella by showering everyday? Legionella bacteria can build up in any shower, tap, or water outlet that is not used regularly as the water in the system remains stagnant. Hence, it is not surprising that these bacteria can be found in a variety of engineered systems that support biofilm growth, including drinking water distribution systems People can get sick by breathing in small droplets of water in the air that contain Legionella. Finally, people breathe in the bacteria or accidently swallow water containing the bacteria into their lungs. Travelers can be exposed to Legionella in contaminated hotel potable water or contaminated whirlpool spas. In this article, we’ll walk through the most common questions about cooling towers and the possibility of Legionnaires’ disease. People get Legionnaires’ disease when they breathe in water or water vapor that contains Legionella. However, they must be eliminated if they are present in drinking water or groundwater in excessive concentrations. A person can be infected by Legionella bacteria by breathing in small water droplets containing the bacteria. This article explains what legionella is, how to prevent it, what to do in case of contamination and what the drinking water directive Can Hard Water & Limescale Increase Legionella Risks? This specialist guide has been written by the water safety experts at Legionella Control International and asks if the presence of hard water and limescale increases the risks from Legionella bacteria and Legionnaires’ disease. The major source is water distribution systems of large buildings, including hotels and hospitals. If you have any reason to believe How Does Pipework Size Influence Legionella Growth in Building Water Systems? In this article, the water safety experts at Legionella Control International look at the role and importance of good building services design, and how, if it’s done correctly it can influence the control of legionella and other waterborne pathogens in building plumbing systems long after practical completion and Mar 15, 2024 · Legionella is sometimes found in a building's water. It defines this bacterial disease and explains how the bacteria spread. If conditions are right, they can spread through tiny water droplets in the air, putting everyone in the vicinity at risk. Apr 19, 2025 · Causes The bacterium Legionella pneumophila causes most cases of Legionnaires' disease. Aug 14, 2019 · If routine monitoring of water systems for Legionella is to become standard practice for determining the risk of Legionnaires' disease for a given building or water system, accurate and quantitative microbiologic environmental testing is needed. They grow optimally inside protozoan hosts, such as free-living amoebae associated with microbial biofilms that coat wet surfaces. Legionnaires' disease is caused by a type of bacteria called Legionella. With low Legionella concentrations in a water source, development of Legionnaires' disease is unlikely. Cases have also been contracted from Legionella -contaminated water in incisions or skin wounds. Infection can also occur by aspiration of contaminated water or ice, particularly in susceptible hospital patients. Oct 24, 2022 · Where does Legionella grow and spread? that are continually wet, and certain devices can then spread droplets of water containing the bacteria. Prevent the diseases that Legionella causes and ensure legal compliance. Legionella can also be present in private well water if the well is contaminated with the bacteria. pneumophila) is the bacterium that is responsible for most cases of Legionnaires’ disease (LD) or Legionellosis. Learn about the 11 factors causing Legionella growth in industrial water systems and discover HOH's tips for preventing Legionella in these systems. They proliferate Legionella is a unique pathogen due to its water-to-air transmission route. org Nov 19, 2016 · The major sources of Legionella are the water distribution systems of large buildings including hotels and hospitals. The aerosols often come from mists created by a water source. If the public water source is contaminated with Legionella, it can enter individual homes through the plumbing system. Dec 6, 2022 · How Does Legionella Get Into Potable Water Systems? Legionella is present in most natural water sources, so when we extract water from rivers, lakes, and streams, it should be assumed that Legionella may enter your water treatment system. The bacteria can cause the flu-like Pontiac fever or the more serious Legionnaires’ disease. What is Legionnaires' disease? Legionnaires' disease is a type of pneumonia (lung infection) caused by bacteria called Legionella. Water management programs that effectively prevent Legionella growth in water systems rely on control and prevention measures, including good system design, proper facility and equipment maintenance, and routine cleaning and disinfection. Jun 9, 2025 · A fact sheet that provides general information about Legionnaires' disease. CDC estimates that 8,000 to 18,000 people are hospitalized with Legionnaires’ disease each year in the U. , lakes, rivers, ground water and soil). Where do Legionella bacteria come from? Legionella are natural inhabitants of water and can be detected in rivers, lakes, and streams. People who get exposed might have symptoms like pneumonia. Know if you’re at risk of Legionnaires’ disease and How does Legionella get into a system? Water supply to building • Even with applicable regulations, sometimes undetectable amounts of Legionella come from the municipal water supply A: Legionella is common in the environment and grows best in warm water, so when we test cooling towers and evaporative condensers, we are likely to find it. Dec 4, 2022 · Legionnaires’ disease is a severe form of pneumonia caused by the bacterium Legionella pneumophila. It outlines the ideal environments for bacterial growth, the role of water temperature and stagnation, and how aerosols become the main vehicle for infection. Legionnaires' Disease Legionnaires’ disease is a serious type of pneumonia you get when Legionella bacteria infect your lungs. Legionella bacteria can get into a person’s lungs when they breathe in water droplets that have the bacteria in it. Examples of areas where Legionella can grow and spread include: water h rs, water filters, faucets, aerators, showerheads, hoses, pipes, hot tubs, and respiratory equipm Apr 7, 2020 · Understand how Legionella bacteria enter building water systems, the risks they pose, and why standard drinking water regulations may not prevent their spread. Learn more about the symptoms, causes How long does it take for Legionnaires to develop in water? Legionnaires' disease usually develops two to 10 days after exposure to legionella bacteria. Legionella concentrations are usually low in natural waters, a few hundred units per litre at the most. The fact sheet describes symptoms and who's at increased risk for getting Legionnaires' disease. How Does Legionella Spread to Increase the Risks from Legionnaires’ Disease? Legionnaires’ disease is a potentially serious lung infection caused by Legionella bacteria, contracted through the inhalation of fine water droplets or vapour containing the bacteria. Mar 15, 2024 · It's important to monitor the temperature, disinfectant residuals, and pH of building water, and identify areas where water moves slowly. Typically, the bacterium resides and grows in water systems (including as a biofilm on pipes), but it must be aerosolized and inhaled or aspirated to cause disease. First, factors lead to Legionella growth in building water systems. Under rare circumstances, people can get sick with Legionella when water accidently goes into the lungs while drinking water contaminated with the bacteria. Aug 5, 2024 · Legionnaires' disease is a serious lung infection (pneumonia) with chills, high temperature (fever) and muscle pains. This bacterium can cause Legionnaires’ disease. This bacteria spreads Legionnaires' disease, which can be fatal. It’s chillers and hot tubs and water features that aerosolize Legionella particles. Finally, water treatment and distribution conditions may affect each of these factors. How does Legionella get into my building water systems? Legionella can enter your building water system when receiving treated drinking wa-ter or from untreated groundwater, such as a private well. Signs and symptoms include cough, shortness of breath, high fever, muscle pains, and headaches. Jun 8, 2022 · Legionella is a type of bacteria that can grow in water, usually found in warm and stagnant water. However, most healthy people exposed to Legionella do not become sick. Nov 1, 2024 · Legionella bacteria thrive in warm, damp environments like cooling towers. These bacteria live in fresh water but can be harmful in man-made water systems. Dec 24, 2018 · Legionellosis, recognized as an acute bacterial disease, whose etiological agent is Legionella bacteria, has two very well defined and different epidemiological and clinical forms: legionnaires disease (legionnaires Pneumonia) and Pontiac Fever (Non-pneumonic Legionellosis). These sources include: air conditioning cooling towers, whirlpool spas and showers. Here you can find out more about Legionella and how long it can survive in water. [3] These bacteria are common in many places, like What protects legionella and other waterborne pathogens in water systems? It’s in every water system in every building. Get the facts about Legionella from SafePlumbing — the safest place for information about plumbing fixtures & fittings. The bacteria can be spread by devices that create water mist such as hot tubs, showers, decorative fountains, and cooling towers. Legionnaires’ disease can be life-threatening. One common source is the public water system. It sickens about 5,000 people in the U. Regular using (flushing) fixtures, with Nov 19, 2016 · How do I Get the Disease? Inhaling small aerosol particles that contain Legionella is the most popular theory of how people get infected with legionellosis. Sep 6, 2022 · The most common form of transmission of Legionella is inhalation of contaminated aerosols produced in conjunction with water sprays, jets or mists of contaminated water sources. Legionella is a type of bacteria that can cause a severe form of pneumonia, known as Legionnaires' disease, and is found naturally in fresh water environments. It frequently begins with the following signs and symptoms: Headache. "Aspiration" is the most common way that bacteria enter into the lungs to cause pneumonia. Inhaling water mist that contains Legionella bacteria can cause an infection in the lungs. In general, it isn't spread person to person. People can get infected after inhaling water droplets contaminated with the bacteria. It can be serious, especially in those who are older or are immunocompromised. Even lower Legionella concentrations in water can cause illnesses, as the likelihood of illness is affected by such factors as the pathogenicity of the Legionella population and the health of the exposed person. The risk of infection increases as Legionella concentrations increase in water sources. [1] This often begins 2–10 days after exposure. But when it gets into water systems, Legionella can become a real nuisance. When a person is exposed to Legionella bacteria, they are at high risk of contracting Legionnaires disease, a severe form of pneumonia (inflammation of The disease-causing bacterium, Legionella pneumophila, is a waterborne pathogen found in natural and man-made water systems. New evidence shows a more common way of contracting the disease. It also provides information about how to recognize Legionnaires’ disease and identify Legionella hazards in the workplace, as these are critical elements of an effective water management program Feb 6, 2024 · Legionella and Legionnaires' disease Stagnant or standing water in a plumbing system can increase risk for growth and spread of Legionella and other biofilm-associated bacteria. It needs to be in areas with low levels of oxygen to survive and can live in waters with a range of acidity levels. Aug 19, 2025 · Legionella is a widespread bacterium in the environment which, in low concentrations, also finds its way into our groundwater or drinking water. However, older adults and people with health conditions are at higher risk of developing Legionnares’ disease, which causes symptoms like pneumonia. Learn how to get rid of legionella in building water systems, who should manage the process & how to prevent Legionnaires disease at work. Dec 23, 2024 · Legionella bacteria can be found throughout the world, mostly in aquatic and moist environments (e. longbeachae) has been found in potting soil. Finding Legionella doesn't necessarily mean that people will get sick. Legionella thrives in warm water environments, typically between 20°C and 50°C (68°F and 122°F). Jun 9, 2025 · Water containing Legionella can spread in droplets small enough for people to breathe in. If possible, operate below the most favorable Legionella growth range (77–113°F, 25–45°C). It can get in water systems in a variety of ways, such as from air-conditioning systems, plumbing and hot water tanks, and from stagnant water sources such as ponds, fountains and other water features. Not everyone who is exposed to the bacteria gets sick, but if a person has Legionnaires’ disease is transmitted through contaminated water vapor, it is not spread through person-to-person contact. 1 Legionella can live and reproduce within certain protozoa (intracellular parasite), such as amoeba, and is commonly found within biofilm growing inside a building’s plumbing (see Legionella bacteria, the causative agent of legionellosis, are commonly found in fresh water including manmade aquatic systems such as cooling towers, indoor plumbing, pools, and other water features. Jan 10, 2024 · How Does Legionella Get Into A Building’s Water System? Simply put, Legionella enters a building’s water system when there is a reduction in disinfectant levels. Guests were told to evacuate the hotel until the source of the bacteria was determined and remediation was complete. Community outbreaks are caused by exposure to a wide variety of sources, but potable water and cooling towers are the most common. g. This disease is a type of pneumonia that can be fatal if untreated. What if my home is tested for Legionella in the drinking water and the test is positive? Consult with your state and county health departments. The Legionella bacteria are found naturally in the environment, usually in water. Jul 19, 2019 · An outbreak of Legionella recently occurred at a hotel in Atlanta. The earlier the illness is treated with antibiotic medication, the better the likely outcome. Apr 11, 2024 · From what I’ve read, it seems that domestic hot water isn’t where most cases of Legionnaires’ disease come from. Both potable and non-potable (utility) water supplies harbor Legionella pneumophila, and have been linked to outbreaks of both hospital- and community-acquired Legionnaires' disease. each year. Water heaters, cooling towers, and warm, stagnant water can provide conditions that promote Legionella growth. However, it NYSDOH also recommends that hot water storage tanks be drained, cleaned and disinfected according to manufacturer’s recommendations or at least annually. You can catch Legionnaires Disease from a hot water heater. 5, and a dissolved oxygen concentration in water of 0. Check the Aug 14, 2019 · Legionella bacteria reside in many natural environments including rivers, lakes, and soils. But here’s the good news: the risk is preventable. When turned on, bacteria will flow out of the system with water, and whoever is using the shower will breathe in aerosols containing Legionella bacteria. Use automation: Automate anti-corrosion, anti-scale, and disinfectant addition and monitoring. Jan 2, 2025 · Legionella is a type of bacteria found in both natural and man-made water systems. Legionella can be found at low concentrations in any public water system. Because of the steam or mist they generate, hot tubs are a common source of Legionnaires’ disease outbreaks. Hazard Recognition This page describes the conditions that promote Legionella growth in the manmade water systems that frequently serve as Legionella sources when there is a Legionellosis outbreak. Legionella can be present in water at many places where people live, work, and play. Legionella can be found naturally in freshwater environments (like lakes and streams), but generally only becomes a health concern when it grows and spreads in manmade plumbing structures (e. The disease-causing bacterium, Legionella pneumophila, is a waterborne pathogen found in natural and man-made water systems. Legionella species are ubiquitous bacteria in natural environments and in artificial water reservoirs. What is important to know is how much legionella is there. Legionella may not infect most people. It becomes a health concern when it grows and spreads in human-made building water systems Jul 23, 2024 · How is it spread? Legionnaires’ disease is spread by small water droplets in the air that contain Legionella bacteria. A deeper comprehension of Legionella interactions in water distribution systems with the environmental conditions is needed for better control of the colonization. Legionella can also be found in water distribution systems and plumbing in buildings. Legionella bacteria are naturally found at low levels in lakes, ponds, and streams. Legionnaires’ disease is a severe form of pneumonia caused by the pathogenic Legionella pneumophila. Electric water heaters have an increased hazard. The bacteria grow best in warm water, like the kind found in hot tubs, cooling towers, hot water tanks, large plumbing systems, and decorative fountains that are not properly maintained. This is the most common way people get sick. Jun 9, 2025 · This infographic visualizes how Legionella affects building water systems and people. And there’s another reason I feel it’s not such a big a risk in my hot water system. Dec 20, 2016 · How do I Get the Disease? Inhaling small aerosol particles that contain Legionella is the most popular theory of how people get infected with legionellosis. Legionella bacteria can be found naturally in freshwater environments such as lakes and streams. 1. Test for Legionella bacteria The ideal way to objectively validate any Legionella bacteria growth minimization effort is to regularly test for Legionella bacteria. How do Legionella bacteria enter the water system of a building? Legionella bacteria are widespread within the natural water environment (rivers, lakes, ponds and reservoirs) and can be found in soils and mud. The illness is serious and can be fatal. There are two distinct forms of legionellosis - Pontiac Fever and the more severe Dec 9, 2020 · What is premise plumbing? The term “premise plumbing system” refers to the portion of the water distribution system from the water meter to the tap in homes and buildings. Other sources include mist machines, humidifiers, whirlpool spas, and hot springs. Jun 8, 2021 · We are often asked how long can legionella survive. In those places the bacteria rarely cause infections. You can get Legionnaires’ disease from water or cooling systems in large buildings, like hospitals or hotels. Jun 3, 2024 · Wondering how long it takes for legionella to develop in water? It may be sooner then you think, so read our expert guide today. Jan 7, 2025 · Legionella is a bacteria that grows naturally in freshwater environments. It also discusses how healthcare providers diagnose, test for, and treat this type of pneumonia. People can get Legionnaires' disease by breathing in mist containing Legionella bacteria. Mar 3, 2023 · Over the last two years, Legionella bacteria detected in the plumbing systems of a motel, campground and an office park in New Hampshire may have contributed to reported cases of Legionnaires’ disease for people using the water at these facilities. Nov 19, 2024 · Legionnaires Disease (Legionellosis) is a serious kind of pneumonia caused by Legionella bacteria. Outdoors, legionella bacteria live in soil and water. Dec 10, 2020 · Management of Legionella in Water Systems reviews the state of science on Legionella contamination of water systems, specifically the ecology and diagnosis. [2] A legionellosis is any disease caused by Legionella Jul 8, 2025 · How does it spread? Legionella bacteria live in various sources of water — both natural and man-made. What is Legionella? Legionella is a bacterium commonly found in natural and man-made aquatic environments. Depending on testing information, building owners and managers may need to take action. Legionnaires Disease | FAQ How does a person get Legionnaires’ disease? Legionnaires’ disease can be contracted when water droplets containing Legionella bacteria enter a person’s lungs. There are a few ways to kill Legionella bacteria, one of the most common ways to control the risk is by managing water temperatures. S. These bacteria thrive in stagnant or warm water and, if Legionella can survive in varied water conditions, in temperatures of 0-63 oC, a pH range of 5. Aug 6, 2025 · Key points Legionnaires' disease is a serious type of pneumonia caused by Legionella bacteria. Promptly addressing any identified issues can help reduce the risk of Legionella growth and spread within a building's water system. 1991). Introduction to Legionnaires Disease Legionnaires’ disease is a serious type of pneumonia. tmzpt9 1dp lt xd oyol ggyj7ra jod9yl ekhd snhwnv ngmj