Section R. 325.10612 - Groundwater supply rules; general requirements; applicabilityRule 612.
(1) This rule, R 325.10612a, and R 325.10739 to R 325.10739b apply to all community and noncommunity water supplies that use groundwater except that it does not apply to public water supplies that combine all of their groundwater with surface water or with groundwater under the direct influence of surface water before treatment under R 325.10611. For purposes of this rule, R 325.10612a, and R 325.10739 to R 325.10739b, "groundwater supply" is defined as any community water supply or noncommunity water supply meeting this applicability statement, including consecutive supplies receiving finished groundwater.(2) Groundwater supplies subject to this rule shall comply with all of the following requirements: (a) Groundwater supplies shall provide the department, at the department's request, any existing information that will enable the department to conduct a sanitary survey as defined in R 325.10108.(b) Microbial source water monitoring requirements for groundwater supplies that do not treat all of their groundwater to not less than 99.99% (4-log) treatment of viruses (using inactivation, removal, or a department-approved combination of 4-log virus inactivation and removal) before or at the first customer as described in R 325.10739.(c) Treatment technique requirements, described in R 325.10612a, that apply to groundwater supplies that have fecally contaminated source waters, as determined by source water monitoring conducted under R 325.10739, or that have significant deficiencies. A significant deficiency includes but is not limited to, a defect in design, operation, or maintenance, or a failure or malfunction of the sources, treatment, storage, or distribution system that the department determines to be causing, or have potential for causing, the introduction of contamination into the water delivered to consumers. A groundwater supply with fecally contaminated source water or with significant deficiencies subject to the treatment technique requirements of this rule shall implement 1 or more of the following corrective action options: (i) Correct all significant deficiencies.(ii) Provide an alternate source of water.(iii) Eliminate the source of contamination(iv) Provide treatment that reliably achieves not less than 4-log treatment of viruses, using inactivation, removal, or a department-approved combination of 4-log virus inactivation and removal, before or at the first customer.(d) Groundwater supplies that provide not less than 4-log treatment of viruses, using inactivation, removal, or a department-approved combination of 4-log virus inactivation and removal, before or at the first customer are required to conduct compliance monitoring to demonstrate treatment effectiveness, as described in R 325.10739a.(e) If requested by the department, groundwater supplies shall provide the department with any existing information that will enable the department to perform a hydrogeologic sensitivity assessment. For the purposes of this rule, "hydrogeologic sensitivity assessment" is a determination of whether groundwater supplies obtain water from hydrogeologically sensitive settings.(f) Groundwater supplies shall comply, unless otherwise required, with the requirements of this rule beginning December 1, 2009.Mich. Admin. Code R. 325.10612