Ohio Administrative Code › Title 3745 - Ohio Environmental Protection Agency › Chapter 3745-81 - Primary Drinking Water Rules › Section 3745-81-65 - Source monitoring requirements

Current through all regulations passed and filed through July 1, 2024
(A) Initial round of source water monitoring.
Systems shall conduct the following monitoring on the schedule
				in paragraph (C) of this rule unless they meet the monitoring exemption
				criteria in paragraph (D) of this rule.
(1) Systems serving at least ten thousand
			 people shall sample their source water for Cryptosporidium, E. coli, and
			 turbidity at least monthly for twenty-four months.
(2) Systems serving less than ten thousand
			 people shall sample their source water for E. coli at least once every two
			 weeks for twelve months.
(3)
			 Systems serving less than ten thousand people may avoid E. coli monitoring if
			 the system notifies the director that it will monitor for Cryptosporidium as
			 described in paragraph (A)(4) of this rule. The system shall notify the primacy
			 agency at the time of this requirement, no later than three months prior to the
			 date the system is otherwise required to start E. coli monitoring under
			 paragraph (C) of this rule.
(4)
			 Systems serving less than ten thousand people shall sample their source water
			 for Cryptosporidium at least twice per month for twelve months or at least
			 monthly for twenty-four months if they meet one of the following, based on
			 monitoring conducted under paragraph (A)(2) of this rule:
(a) For systems using lake/reservoir sources,
			 the annual mean E. coli concentration is greater than ten E. coli per one
			 hundred milliliters.
(b) For
			 systems using flowing stream sources, the annual mean E. coli concentration is
			 greater than fifty E. coli per one hundred milliliters.
(c) The system does not conduct E. coli
			 monitoring as described in paragraph (A)(2) of this rule.
(d) Systems using a well designated as surface water in accordance with rule
			 3745-81-76
			 of the Administrative Code shall comply with the requirements of paragraph
			 (A)(4) of this rule based on the E. coli level that applies to the nearest
			 surface water body. If no surface water body is nearby, the system shall comply
			 based on the requirements that apply to systems using lake/reservoir
			 sources.
(5) For systems
			 serving less than ten thousand people, the primacy agency at the time of this
			 requirement may accept monitoring for an indicator other than E. coli under
			 paragraph (A)(2) of this rule. The primacy agency also may accept an
			 alternative to the E. coli concentration in paragraph (A)(4) of this rule to
			 trigger Cryptosporidium monitoring. This acceptance by the primacy agency shall
			 be provided to the system in writing and shall include the basis for the
			 primacy agency's determination that the alternative indicator and/or trigger
			 level will provide a more accurate identification of whether a system will
			 exceed the Bin 1 Cryptosporidium level in paragraphs (A) to (D) of rule
			 3745-81-67
			 of the Administrative Code.
(6)
			 Systems may sample more frequently than required under this paragraph if the
			 sampling frequency is evenly spaced throughout the monitoring period.