Health Risks & Legionnaires Disease

Legionnaires disease is a severe respiratory infection caused by Legionella pneumophila. Symptoms are similar to pneumonia and can include:

• Cough and shortness of breath

• Fever and chills

• Muscle aches

Pontiac fever is a less severe illness caused by Legionella species but still indicates exposure to contaminated water.

Outbreaks are often linked to cooling towers, large buildings, and shared contaminated water sources.

Public health agencies, including the Centers for Disease Control and Prevention (CDC), emphasize routine monitoring and testing as part of Legionella risk management programs.

Legionella Testing Methods

Aquatrol provides Legionella testing using established laboratory test methods designed to detect Legionella species in water samples.

Culture Testing (Gold Standard)

Legionella culture is widely considered the gold standard for detecting viable Legionella bacteria. This method allows laboratories to identify Legionella pneumophila and other Legionella spp present in water samples.

However, culture testing requires incubation time and may not detect all viable but non-culturable organisms.

Molecular Testing (PCR)

Molecular testing methods, including polymerase chain reaction (PCR), provide rapid Legionella detection by identifying genetic material through DNA extraction.

Real time PCR allows for:

• Faster test results

• Detection of multiple Legionella species

• Identification of Legionella pneumophila serogroup variations

PCR testing can detect both live and dead cells, which may result in false positives or false positive results if not interpreted correctly.

Interpreting Test Results

Understanding test results is critical for effective Legionella control.

• Culture testing identifies viable bacteria

• PCR testing provides rapid detection but may detect dead cells

• False positives can occur depending on test methods and sample conditions

Aquatrol helps facilities interpret Legionella test results and determine appropriate next steps based on system conditions and risk level.

Sample Collection & Routine Monitoring

Accurate Legionella detection begins with proper sample collection. Water samples are collected from critical points within water systems, including:

• Cooling towers

• Plumbing systems

• Heat exchangers

• Storage tanks and distribution systems

Routine monitoring is essential to detect Legionella early and prevent system-wide contamination.

Regular Legionella testing helps facilities maintain water safety and comply with recommended water management practices.

Legionella Risk Management in Cooling Towers

Cooling towers present one of the highest risks for Legionella growth due to warm water, airborne exposure, and open system design.

Legionella testing in cooling towers focuses on:

• Detecting Legionella bacteria in circulating water

• Monitoring biological growth and system conditions

• Identifying risk of aerosolized exposure

Proper water treatment, including biocide programs, is required to control Legionella bacteria and maintain safe operation.

Supporting Water Safety & Compliance

Legionella testing is part of a broader water safety and disease prevention strategy. Facilities are expected to implement water management plans that include:

• Routine Legionella testing

• Monitoring of water quality and temperature

• Control of scale, corrosion, and biofilm

• Documentation of risk assessment and risk management measures

These programs support compliance with public health guidance and reduce liability associated with Legionella outbreaks.

Aquatrol’s Approach to Legionella Testing

Aquatrol provides Legionella testing services as part of a complete water treatment and monitoring program.

Our approach includes:

• Sampling and laboratory coordination

• Evaluation of test methods and detection results

• Support for outbreak investigation when required

• Integration with water treatment programs

• Ongoing monitoring and system review

We work with facility teams to ensure that testing results are understood and acted on appropriately.

Applications Across Facilities

Aquatrol supports Legionella testing across a range of environments, including:

• Cooling towers in industrial and commercial facilities

• Healthcare facilities and sensitive environments

• Large buildings with complex plumbing systems

• Industrial water systems and process equipment

Each facility requires a tailored approach based on system design, water usage, and risk profile.

Maintain Water Safety & Control Legionella Risk

Legionella growth in water systems can lead to serious health risks and regulatory concerns if not properly managed.

Aquatrol helps facilities monitor water systems, detect Legionella bacteria, and implement practical control strategies to reduce risk and maintain safe operation.

If your facility requires Legionella testing or a review of your water management program, contact Aquatrol to schedule a system evaluation.