Iowa Administrative Code › Agency 567 - Environmental Protection Commission › Title II - Air Quality › Division B › Chapter 41 - Water Supplies › Rule 567-41.7 - Groundwater Rule: Sanitary Survey, Microbial Source Water Monitoring, Treatment Technique

Current through Register Vol. 47, No. 3, July 24, 2024
(1)
General requirements.
a.
Scope.
The requirements of this rule constitute national
				  primary drinking water regulations.
b.
Applicability.
This rule
				  applies to all public water systems that use groundwater except that it does
				  not apply to public water systems that combine all of their groundwater with
				  surface water or with influenced groundwater prior to treatment under
				  567-435. (455B). For the
				  purposes of this rule, "groundwater system" is defined as any public water
				  system meeting this applicability statement, including consecutive systems
				  receiving finished groundwater. For the purposes of this rule, "4-log treatment
				  of viruses" means treatment that includes inactivation, removal, or a
				  department-approved combination of inactivation and removal before or at the
				  first customer of 4-log (99.99%) of viruses.
c.
General requirements.
Systems subject to this rule must comply with the following requirements:
(1) Sanitary survey information requirements
				  for all groundwater systems as described in 41.7(2).
(2) Microbial source water monitoring
				  requirements for groundwater systems that do not treat all of their groundwater
				  to at least 99.99 percent (4-log) treatment of viruses, using inactivation,
				  removal, or a department-approved combination of inactivation and removal
				  before or at the first customer, as described in 41.7(3).
(3) Treatment technique requirements, as
				  described in 41.7(4), that apply to groundwater systems that have fecally
				  contaminated source waters, as determined by source water monitoring conducted
				  under 41.7(3), or that have significant deficiencies that are identified by the
				  department. A groundwater system with fecally contaminated source water or with
				  significant deficiencies subject to the treatment technique requirements of
				  this rule must implement one or more of the following corrective action
				  options:
1. Correct all significant
				  deficiencies;
2. Provide an
				  alternate source of water;
3.
				  Eliminate the source of contamination; or
4. Provide treatment that reliably achieves
				  at least 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.
(4) Groundwater systems that provide at least
				  4-log treatment of viruses are required to conduct compliance monitoring to
				  demonstrate treatment effectiveness, as described in 41.7(4).
(5) If requested by the department,
				  groundwater systems must 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 systems obtain water from
				  hydrogeologically sensitive settings.
(6) Certified laboratory requirements.
				  Analyses under this rule shall only be conducted by laboratories that have been
				  certified by the department and are in compliance with the requirements of
				  567-Chapter 83.