ISO 11731-2:2004 PDF Download

ISO 11731-2:2004 provides a standardized procedure for detecting and quantifying Legionella bacteria in water samples with low bacterial counts. The standard is applicable to various types of water sources, including those intended for human use, consumption, and treated bathing waters.

The method described in ISO 11731-2:2004 involves the use of a direct membrane filtration technique, where water samples are passed through a membrane filter to isolate and concentrate the Legionella organisms present. The low bacterial count requirement is important to ensure that the growth of other bacterial colonies does not inhibit the growth of Legionella on the membrane.

This standard serves as a valuable tool for monitoring the presence of Legionella in water sources, particularly in situations where the expected levels of the bacteria are low.