Legionella laboratory analysis: accurately detect and quantify Legionella spp.
The presence of Legionella in water systems constitutes a major health risk, particularly in industrial facilities , public establishments (hospitals, hotels, spas) and water cooling systems . These bacteria, naturally present in aquatic environments, can proliferate in hot water circuits, cooling towers and other poorly maintained installations. When inhaled in the form of aerosols, they can cause Legionnaires' disease , a potentially serious lung infection.
Carrying out a laboratory analysis of legionella is therefore essential to identify contamination and implement corrective actions to prevent health risks . Regular monitoring of the microbiological quality of water makes it possible to anticipate any development of the bacteria and ensure compliance with current regulatory requirements.
Legionella analysis methods: culture and PCR
YesWeLab offers analyses that comply with ISO 11731 , the regulatory reference for the detection and quantification of Legionella spp. and Legionella pneumophila . Our laboratories implement several analytical techniques to guarantee accurate and quickly usable results:
- ISO 11731 culture method : reference technique for the isolation and enumeration of viable legionella on specific media (GVPC, BCYE). This method remains the most reliable for confirming the presence and concentration of Legionella spp. in a water network.
- PCR (Polymerase Chain Reaction) analysis : This molecular technique allows Legionella spp.- specific genes early detection and immediate response to suspected contamination.
The combination of these two methods provides a comprehensive analysis: PCR provides a rapid response, while culture confirms the viability of the bacteria and their ability to multiply.
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Applications and sectors concerned
Applications and sectors concerned
Legionella analysis is used in sectors where the microbiological quality of water is a critical issue. Current regulations require regular checks to ensure user safety and prevent epidemics.
- Monitoring of drinking and sanitary water networks : monitoring of domestic hot water circuits, cooling towers, hospital networks and public buildings. Legionella thrives particularly in installations where the water temperature is between 25°C and 45°C, requiring increased monitoring.
- Industry and cooling : monitoring of industrial water, cooling circuits and thermal installations to limit bacterial proliferation and avoid contamination of workers and local residents.
- Environment and risk management : prevention of contamination in wastewater treatment plants, retention basins, public fountains and other infrastructures where stagnant water encourages the development of legionella.
Why choose YesWeLab for your legionella analyses?
With YesWeLab , you benefit from a accredited laboratories specialized in legionella control, guaranteeing reliable results that comply with regulatory requirements . We support our clients in implementing a monitoring strategy adapted to their facilities and current regulations .
Our services include:
- Analyses in accordance with current standards (ISO 11731, ICPE regulations, health control of ERP, ANSES recommendations).
- Detailed analysis reports with interpretation of results and recommendations for corrective actions if necessary.
- A digital solution for simplified sample management, real-time monitoring of results and complete traceability of analyses carried out.
- Technical support to help you define a control plan adapted to your needs and meet the requirements of health authorities.
Order your Legionella analysis today and ensure your facilities are compliant with YesWeLab.

Léa Géréec
Technical and scientific advisor