Rule 1510.
In addition to the requirements of R 325.11506, a community or noncommunity water supply subject to the total coliform rules in R 325.10704a shall maintain in its records the assessment form, regardless of who conducts the assessment, and documentation of corrective actions completed as a result of those assessments, or other available summary documentation of the sanitary defects and corrective actions taken under R 325.10704i for department review. This record shall be maintained by the supply for a period not less than 5 years after completion of the assessment or corrective action.
Mich. Admin. Code R. 325.11510