[Drinking water analysis for Legionella. Suggestions for sampling, laboratory analysis and assessment]

Area of Science:

• Microbiology
• Environmental Science
• Public Health

Context:

• Frequent testing of drinking water from building installations for Legionella bacteria is standard practice.
• Experience highlights challenges in achieving uniform and comparable analysis results.
• The implementation of DIN EN ISO 19458 necessitates modifications to existing sampling and assessment protocols.

Purpose:

• To address practical questions arising from routine Legionella testing in drinking water.
• To facilitate uniform and comparable execution of Legionella analyses.
• To guide necessary changes in current sampling and assessment programs due to new standards.

Summary:

• The study discusses practical aspects of drinking water analysis for Legionella, emphasizing the impact of DIN EN ISO 19458 on sampling procedures.
• Crucial elements for laboratory investigation include stringent quality control of membrane filters and culture media.
• Accurate assessment of quantitative Legionella results depends on understanding the building's water system and relevant hygiene factors.

Impact:

• Standardization of Legionella testing procedures will improve data reliability and comparability across different facilities.
• Enhanced laboratory quality control measures are vital for accurate detection and quantification of Legionella.
• Expert assessment of results, considering system-specific factors, is crucial for effective hygiene management and risk mitigation in buildings.