What procedure is followed when a sample test is positive for total coliforms?.
a. No action is required if this is the only sample which exceeds 4 colonies per
b. No action is required if the average monthly coliform density does not exceed
one colony per 100 ml.
Within 24 hours, at least one repeat sample, from the same tap where the
original sample was taken, is tested until a negative result sampling is
d. No action is required if less than five percent of the samples exceed four
colonies per 100 ml.
What method is used for total coliform testing instead of estimation of the coliform
a. Presence/Absence method.
b. Membrane-filter technique.
d. Basic filtering volume technique.
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