Frequent Questions

Is grandfather data allowed for systems with population under 10,000 persons that take monthly source water bacteria for E. coli? Are they allow to use the last 24 months of monthly E.coli data?

Grandfathered data could be used only in the first round of monitoring, and the first round of monitoring concluded five years ago.  See 141.701(h).

They are also required to have six years between the monitoring, which would preclude the use of the last 24 months of monitoring data.

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