Mich. Admin. Code R. 325.10401
Rule 401. The purpose of this part is to prescribe requirements of public water supplies to provide public notification to persons served by a public water supply when the public water supply is not in compliance with a state drinking water standard, a monitoring requirement, or the requirements of a compliance schedule prescribed by a variance or exemption or while a variance or exemption is in effect. This part also prescribes requirements for public education when a community or nontransient noncommunity water supply exceeds the lead action level based on tap water samples collected under R 325.10710a. This part also prescribes requirements for consumer confidence reports (CCR) and annual water quality reports. For the purpose of this part applicable public water supplies are also considered "water supplies" or "supplies."
Mich. Admin. Code R. 325.10401