This document specifies a method for the enumeration of Pseudomonas aeruginosa in water. The
method is based on the growth of target organisms in a liquid medium and calculation of the most
probable number (MPN) of organisms by reference to MPN tables.
This document is applicable to a range of types of water. For example, hospital waters, drinking water
and non‐carbonated bottled waters intended for human consumption, groundwater, swimming pool
and spa pool waters including those containing high background counts of heterotrophic bacteria.
This document does not apply to carbonated bottled waters, flavoured bottle waters, cooling tower
waters or marine waters, for which the method has not been validated. These waters are, therefore,
outside the scope of this document. Laboratories can employ the method presented in this document
for these matrices by undertaking appropriate validation of performance of this method prior to use.
The test is based on a bacterial enzyme detection technology that signals the presence of P. aeruginosa
through the hydrolysis of a 7‐amino‐4‐methylcoumarin aminopeptidase substrate present in a special
reagent. P. aeruginosa cells rapidly grow and reproduce using the rich supply of amino acids, vitamins
and other nutrients present in the reagent. Actively growing strains of P. aeruginosa have an enzyme
that cleaves the 7‐amido‐coumarin aminopeptidase substrate releasing a product which fluoresces
under ultraviolet (UV) light. The test described in this document provides a confirmed result within
24 h with no requirement for further confirmation of positive wells.