Using guidelines for Canadian Recreational Water Quality - what is the acceptable level of E. coli for the geometric mean concentration?

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Using guidelines for Canadian Recreational Water Quality - what is the acceptable level of E. coli for the geometric mean concentration?

In the Canadian Recreational Water Quality guidelines, the level used to judge E. coli contamination is the geometric mean of multiple samples, not a single measurement. This approach accounts for day-to-day variability and the skewed distribution of bacterial counts, so it gives a more reliable picture of typical contamination. The acceptable level is a geometric mean of no more than 200 E. coli per 100 mL, calculated from at least five samples (collected within the monitoring period). This threshold reflects public health protection while recognizing natural fluctuations in bacterial levels. Options with 100, 50, or 300 per 100 mL do not match the guideline value, which is set at 200 for the geometric mean based on at least five samples.

In the Canadian Recreational Water Quality guidelines, the level used to judge E. coli contamination is the geometric mean of multiple samples, not a single measurement. This approach accounts for day-to-day variability and the skewed distribution of bacterial counts, so it gives a more reliable picture of typical contamination.

The acceptable level is a geometric mean of no more than 200 E. coli per 100 mL, calculated from at least five samples (collected within the monitoring period). This threshold reflects public health protection while recognizing natural fluctuations in bacterial levels.

Options with 100, 50, or 300 per 100 mL do not match the guideline value, which is set at 200 for the geometric mean based on at least five samples.

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