Question

On the report, “coliform” refers to coliform bacteria. Most types of coliform bacteria do not cause serious illness, but their presence in water suggest that other disease-causing organisms may be present. One exception is E. coli, which are coliform bacteria that originate from fecal matter and can cause digestive problems. If E. coli is present in a water sample, it is a sign of fecal contamination.

1. What is the MCL for coliform?

2. What is the MCLG for coliform?

3. What was the number of positives out of the number of samples for the year for Total Coliform?

Answer 1

maximum contaminant level (MCL) , maximum contaminant level goal (MCLG)

The rule set both a health goal (Maximum Contaminant Level Goal (MCLG)) and legal limits (Maximum Contaminant Levels (MCLs)) for the presence of total coliforms in drinking water.

EPA set the MCLG for total coliforms at zero because there have been waterborne disease outbreaks in which researchers found very low levels of coliforms. The MCL levels are based on the positive sample tests for total coliforms (monthly MCL), or for total coliforms and Escherichia coli (E. coli) or fecal coliforms (acute MCL).

No more than 5.0% samples total coliform-positive in a month. (For water systems that collect fewer than 40 routine samples per month, no more than one sample can be total coliform-positive)

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