LGC AXIO Proficiency Testing 2023 - Water & Environmental S…

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Q W AS Water Microbiology

Microorganisms occur in water naturally, the majority are relatively harmless; however, contamination of water from faecal sources can lead to large outbreaks of disease. In many countries, water microbiology is the subject of legislation. Regulations specify how often water sources are sampled, how sampling is done, how the analysis will be performed, for which microorganisms to test, and the acceptable limits for the target microorganisms. The AXIO Proficiency Testing Quality in Water Analysis Scheme (QWAS) has been specifically developed for the microbiological analysis of waters and effluent sludge. Participation in QWAS can provide laboratories with confidence that the results of this analysis and the equipment used to produce those results are meaningful and accurate which, in turn, helps to ensure water safety.

Test Material* Analyte* Bathing,

Total aerobic count, Coagulase-positive staphylococci, Staphylococcus species, Sulphite-reducing Clostridia, Clostridium perfingens

recreational & surface water Bathing, surface & wastewater

Enterococci (faecal streptococci), Escherichia coli, Faecal coliforms, Total coliforms, Salmonella species.

Effluent sludge

Escherichia coli, Salmonella species.

Dialysis water

Total Aerobic Count.

Environmental water

Legionella pneumophila by culture, Legionella pneumophila by PCR. Legionella species by culture, Legionella species by PCR. Clostridium perfringens, Coliforms, Enterococci (faecal streptococci), Escherichia coli, Pseudomonas aeruginosa, Sulphite-reducing Clostridia, Sulphite-reducing Clostridia spores ONLY, Total aerobic count at 22°C and 37°C, Legionella species (low levels) Yeast and mould. Identification of (non-pathogenic) organism to correct family, genus or species level, Somatic coliphages. Pseudomonas aeruginosa, Pseudomonas species, Total aerobic count, Yeast, Mould, Yeast and mould (total).

Potable water

Process water

Enterococci (faecal streptococci), Escherichia coli, Faecal coliforms, Total coliforms.

Sea water

Lyophilised material

Unknown microorganism.

Waste water


Paper exercise (image)

Colony count and calculation of number of microorganisms.

* The full range and availability of test materials and analytes is determined on an annual basis and may be added or removed. For accredited and non-accredited status please see current application form/scheme description.


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