PT rounds - Drinking water

Analyses and occasions 2023

March 2023 September 2023

Quantitative analyses

Suspected coliform bact. (MF)

Coliform bacteria (MF)

"Susp." thermotol.colif. bact. (MF)

E. coli (MF)

Coliform bacteria (MPN rapid method)

E. coli (MPN rapid method)

Pres. Clostridium perfringens (MF)

Clostridium perfringens (MF)

Moulds (MF)

Yeasts (MF)

Actinomycetes (MF)

Colony count 22 °C, 68 h

Slow-growing bacteria 22 °C, 168 h

Quantitative analyses

Suspected coliform bact. (MF)

Coliform bacteria (MF)

"Susp." thermotol.colif. bact. (MF)

E. coli (MF)

Coliform bacteria (MPN rapid method)

E. coli (MPN rapid method)

Susp. intestinal enterococci (MF)

Intestinal enterococci (MF or MPN)

Susp. Pseudomonas aeruginosa (MF)

Pseudomonas aeruginosa (MF or MPN)

Colony count 22 °C, 68 h

Colony count 37 °C, 44 h
Last date for registration 2/5/2023
Test items are sent 2/27/2023
Start of analysis period 3/13/2023
Last date for reporting 4/9/2023
Preliminary report Within 14 days
Final report 6/9/2023
Last date for registration 8/13/2023
Test items are sent 8/28/2023
Start of analysis period 9/11/2023
Last date for reporting 10/1/2023
Preliminary report Within 14 days
Final report 12/1/2023

In general

The analyses of Colony count (culturable microorganisms) should be performed by use of pour-plate technique. The analyses of Coliform bacteria and Escherichia coli with commercial "rapid" methods should be quantified by MPN. All other analyses should be performed by use of membrane filtration method.

Challenging samples - blue labels

All analytical parameters can be checked by use of white labelled samples only. Samples with blue labels are more challenging and are included for educational purposes or to show particular properties. However, the results from these samples will be treated and evaluated in the same manner as samples with white labels.


You may perform analyses of your own interest, only.

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