Water Microbiology (QWAS)
"Choose from 18 types of water sample with our water microbiology proficiency testing scheme"
Our QWAS Water Microbiology proficiency testing scheme is the world’s largest water microbiology proficiency testing programme, trusted by more than 1,000 participating laboratories globally. Established in 2002, it offers a comprehensive choice of 18 water samples – including potable, process, mineral, effluent sludge, industrial, surface/waste/bathing, recreational, sea, dialysis and wastewaters. In addition, it features our best-selling PT-WT-412 sample for the enumeration of E. coli, coliforms, and Enterococci (faecal streptococci).
As well as helping laboratories ensure water safety, and comply with testing regulations in a wide range of countries and regions, successful participation in QWAS can provide laboratories with confidence in their results and the equipment they use.
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{{ "Please see individual products for specific accreditation status" | truncate(70) }} See our accreditations
Scheme Information
Round Dates
Round
Despatch Date
Reporting Deadline
WT353
08 September 2025
13 October 2025
WT354
06 October 2025
10 November 2025
WT355
10 November 2025
15 December 2025
WT356
08 December 2025
26 January 2026
WT358
09 February 2026
16 March 2026
WT359
09 March 2026
13 April 2026
WT360
07 April 2026
11 May 2026
WT361
11 May 2026
15 June 2026
WT362
15 June 2026
20 July 2026
WT363
13 July 2026
17 August 2026
Scheme Documents
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