Missouri Code of State Regulations › Title 10 - DEPARTMENT OF NATURAL RESOURCES › Division 60 - Safe Drinking Water Commission › Chapter 4 - Contaminant Levels and Monitoring › Section 10 CSR 60-4.025 - Ground Water Rule Monitoring and Treatment Technique Requirements

Current through Register Vol. 49, No. 14, July 15, 2024
PURPOSE: This amendment removes sunset language due
				  to the rescission of 10 CSR 60-4.020 Total Coliform
				  Rule and updates citations to other regulations due to concurrent rulemaking
				  amendments.
PUBLISHER'S NOTE: The secretary of state has
				  determined that the publication of the entire text of the material which is
				  incorporated by reference as a portion of this rule would be unduly cumbersome
				  or expensive. This material as incorporated by reference in this rule shall be
				  maintained by the agency at its headquarters and shall be made available to the
				  public for inspection and copying at no more than the actual cost of
				  reproduction. This note applies only to the reference material. The entire text
				  of the rule is printed here.
(1) General Requirements and Applicability.
(A) Scope of this rule. The requirements of
				this rule constitute National Primary Drinking Water Regulations.
(B) Applicability. This rule applies to all
				public water systems that use ground water except that it does not apply to
				public water systems that combine all of their ground water with surface water
				or with ground water under the direct influence of surface water prior to
				treatment. Also, it does not apply to ground water systems under the direct
				influence of surface water. For the purposes of this rule, ground water system
				is defined as any public water system meeting this applicability statement,
				including consecutive systems receiving finished ground water.
(C) General Requirements.
1. Systems subject to this rule must comply
				with sanitary survey information requirements described in section (2) of this
				rule.
2. Wherever it is used in
				this rule, the term "4-log treatment of viruses" shall mean treatment to at
				least ninety-nine and ninety-nine hundredths percent (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.
3. For the purposes of this rule, significant
				deficiencies include but are not limited to defects in design, operation, or
				maintenance, or a failure or malfunction of the sources, treatment, storage, or
				distribution system that the department determines are causing, or have the
				potential for causing, the introduction of contamination into the water
				delivered to consumers.
4. Systems
				subject to this rule must comply with microbial source water monitoring
				requirements for ground water systems that do not treat all of their ground
				water to at least ninety-nine and ninety-nine hundredths percent (99.99%)
				(4-log) treatment of viruses before or at the first customer as described in
				section (3) of this rule.
5.
				Systems subject to this rule must comply with treatment technique requirements,
				described in section (4) of this rule that apply to ground water systems that
				have fecally contaminated source waters, as determined by source water
				monitoring conducted under section (3) of this rule, or that have significant
				deficiencies that are identified by the department, or that are identified by
				the U.S. Environmental Protection Agency under section 1445 of the Safe
				Drinking Water Act. A ground water system with fecally contaminated source
				water or with significant deficiencies subject to the treatment technique
				requirements of this rule must implement one (1) or more of the following
				corrective action options under the direction and approval of the department:
A. Correct all significant
				deficiencies;
B. Provide an
				alternate source of water;
C.
				Eliminate the source of contamination; or
D. Provide treatment that reliably achieves
				at least 4-log treatment of viruses before or at the first customer.
6. Ground water systems that are
				required by this rule to provide at least 4-log treatment of viruses before or
				at the first customer are required to conduct compliance monitoring to
				demonstrate treatment effectiveness, as described in subsection (4)(B) of this
				rule.
7. If requested by the
				department, ground water systems must provide any existing information that
				will enable the department to perform a hydrogeologic sensitivity assessment.
				For the purposes of this rule, a hydrogeologic sensitivity assessment is a
				determination of whether ground water systems obtain water from
				hydrogeologically sensitive settings.