This is also a state call. The only thing required regarding bacteriological samples in distribution systems is that systems have a sample siting plan, and collect samples according to that plan. These are routine and follow-up samples, not samples related to operations and maintenance activities. The states may require the collection of hydrant change out samples, but EPA does not.
What are the regulations regarding changing a fire hydrant out for a new one while water is shut off to six service connections? Is it necessary to collect bacteriological samples or only chlorine residual?
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