The Connection Between Legionnaire's Disease and Swimming Pools

The Connection Between Legionnaire's Disease and Swimming Pools Jun, 18 2023

Understanding Legionnaire's Disease

Before diving into the connection between Legionnaire's Disease and swimming pools, it is essential to understand what this disease is. Legionnaire's Disease is a severe and potentially fatal form of pneumonia caused by the Legionella bacteria. This bacteria thrives in warm water environments, such as hot tubs, cooling towers, and, yes, swimming pools. It is usually contracted by inhaling water droplets containing the bacteria.


Legionnaire's Disease is not contagious and cannot be spread through person-to-person contact. Instead, it is contracted directly from the environment. The symptoms of this disease can be quite severe and include high fever, chills, cough, muscle aches, and headaches. In some cases, it can also lead to respiratory failure, kidney failure, or even death. It is essential to be aware of the risks and take the necessary precautions to prevent the spread of this harmful bacteria.

The Role of Swimming Pools in Legionnaire's Disease Outbreaks

Swimming pools are a common site for Legionnaire's Disease outbreaks. This is because the warm water in pools provides an ideal environment for the Legionella bacteria to grow and multiply. The bacteria can then be dispersed into the air through water droplets, which can be inhaled by swimmers and other individuals near the pool.


Outbreaks of Legionnaire's Disease have been linked to various types of swimming pools, including public pools, hotel pools, and even residential pools. It is essential for pool owners and operators to be aware of the risks associated with Legionella bacteria and take the necessary steps to prevent its growth and spread.

Maintaining Proper Pool Water Quality

One of the most critical factors in preventing the growth of Legionella bacteria in swimming pools is maintaining proper water quality. This means ensuring that the pool water is clean, clear, and properly sanitized. A well-maintained pool will have a reduced risk of Legionella bacteria growth, leading to a safer environment for swimmers.


Proper water quality can be achieved through regular pool maintenance, including testing and adjusting the water's pH and sanitizer levels, as well as regular cleaning and filtration. Pool owners and operators should be diligent in their maintenance routines to ensure the safety of their guests and swimmers.

Implementing a Legionella Management Plan

In addition to maintaining proper pool water quality, it is essential for pool owners and operators to have a Legionella management plan in place. This plan should outline the steps that will be taken to prevent the growth and spread of Legionella bacteria in the pool environment. Elements of a Legionella management plan may include:


  • Regular water testing for Legionella bacteria
  • Implementing a water treatment program that includes proper disinfection and filtration practices
  • Establishing a schedule for cleaning and maintaining pool surfaces and equipment
  • Training staff on Legionella awareness, prevention, and response procedures

Having a comprehensive Legionella management plan in place can help to reduce the risk of Legionnaire's Disease outbreaks and ensure a safe swimming environment for all.

Responding to a Legionnaire's Disease Outbreak

In the event of a Legionnaire's Disease outbreak linked to a swimming pool, it is crucial for pool owners and operators to take immediate action to address the situation. This may include:


  • Closing the pool to the public until the source of the outbreak has been identified and addressed
  • Conducting a thorough investigation to determine the cause of the outbreak and implementing corrective measures
  • Notifying local health authorities and working closely with them to manage the outbreak and prevent further cases
  • Communicating with pool users and the community about the outbreak and the steps being taken to address it

Responding quickly and effectively to a Legionnaire's Disease outbreak can help to minimize its impact and protect the health and safety of pool users.

Protecting Yourself and Others from Legionnaire's Disease

As a swimmer or pool user, you can also take steps to protect yourself and others from Legionnaire's Disease. Some precautions you can take include:


  • Avoiding swimming in pools that appear dirty or poorly maintained
  • Showering before and after swimming to remove any contaminants from your body
  • Reporting any concerns about pool water quality or maintenance to the pool operator or local health authorities
  • Staying informed about Legionnaire's Disease and its risks, and taking steps to protect your health and the health of those around you

By working together, pool owners, operators, and users can help to prevent the spread of Legionella bacteria and reduce the risk of Legionnaire's Disease outbreaks in swimming pools.