ISO 11731:2017

ISO 11731:2017

May 2017
International standard Current

Water quality - Enumeration of Legionella

ISO 11731:2017 specifies culture methods for the isolation of Legionella and estimation of their numbers in water samples. These methods are applicable to all kinds of water samples including potable, industrial, waste and natural waters. These methods can be used for water related matrices, e.g. biofilms, sediments, etc. Not all Legionella species are culturable; therefore, the methods described in this document do not recover all species of Legionella.

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Main informations

Collections

International ISO standards

Publication date

May 2017

Number of pages

38 p.

Reference

ISO 11731:2017

ICS Codes

07.100.20   Microbiology of water

Print number

1
Sumary
Water quality - Enumeration of Legionella

ISO 11731:2017 specifies culture methods for the isolation of Legionella and estimation of their numbers in water samples.

These methods are applicable to all kinds of water samples including potable, industrial, waste and natural waters. These methods can be used for water related matrices, e.g. biofilms, sediments, etc.

Not all Legionella species are culturable; therefore, the methods described in this document do not recover all species of Legionella.

Replaced standards (2)
ISO 11731:1998
May 1998
International standard Cancelled
Water quality. Detection and enumeration of Legionella.

ISO 11731-2:2004
May 2004
International standard Cancelled
Water quality - Detection and enumeration of Legionella - Part 2 : Direct membrane filtration method for waters with low bacterial counts

<p>ISO 11731-2:2004 describes a monitoring method for the isolation and enumeration of <i>Legionella</i> organisms in water intended for human use (e.g. hot and cold water, water used for washing), for human consumption and for treated bathing waters (e.g. swimming pools). It is especially suitable for waters with prospected low numbers of <i>Legionella</i>. As the growth of <i>Legionella</i> may be inhibited by overgrowth of other bacterial colonies on the membrane the method is only suitable for waters containing low bacterial. </p>

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