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Judgment & ambiguity · When to act

You run a water system. After a main break, one of several routine samples comes back positive for total coliform and turbidity ticked up, but the confirmatory results won't be back for a day. Do you issue a boil-water advisory now or wait?

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I lean toward issuing early, because the asymmetry is stark: a boil-water advisory costs inconvenience and some credibility if it turns out unnecessary, while a day's delay on genu…

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