Potable Drinking Water Quality

Question

Hi All
Is there any significant difference between: "Colony count 22 Degrees" and "total bacterial count (number/ml at 37 Degree C)" for target drinking water quality?
Your replies much appreciated.

Luis Bravo-Inclán · Answer

There is a fundamental difference on this two results:  a) One is taking into account the number (or probable) of cells;  b) the other technique is talking about the colony number. So both are different and not necessarily comparable in number or in the same water quality limit.  Sorry.
Luis, Mexico

NAVARAJ PERUMALSAMY · Answer

Two incubation temperatures and times are used: 37 °C for 24 hours to encourage the growth of bacteria of mammalian origin, and 22 °C for 72 hours to enumerate bacteria that are derived principally from environmental sources. 
The colony count at 22 degrees C generally represents those bacteria naturally present in water and are not of sanitary significance. 
Maximum Acceptable Concentration for  Drinking Water  = none detectable per 100 mL This means that in order to conform to the guideline: For every 100 mL of  drinking water  tested, no total  coliforms  or E.coli should be detected.

Saul Aiolfi · Answer

Hello.
The difference is in the growth temperature of the colonies. In the first case check it and 22 degrees and in the second case at 37 degrees. This difference in growth temperatures is fundamental in assessing water quality, as pathogenic microorganisms have an optimal growth of around 37 degrees, which coincides with the temperature of the human body.

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