Filtered water systems serving fewer than 10,000 people, and not electing to sample for Cryptosporidium, must sample their source water for E. coli. at least once every two weeks for 12 months. Surface water systems sampling for E. coli will be triggered
No. Extremely high E. coli sample results can not be excluded from the annual mean concentration just because it was caused from a particular event (e.g. rain event).
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