Michigan Administrative Code › Department - Environmental Quality › Drinking Water And Municipal Assistance Division › Supplying Water to the Public › Part 6 - STATE DRINKING WATER STANDARDS AND ANALYTICAL › Section R. 325.10612 - Groundwater supply rules; general requirements; applicability

Current through Vol. 24-12, July 15, 2024
Rule 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.