Ohio Administrative Code › Title 3745 - Ohio Environmental Protection Agency › Chapter 3745-81 - Primary Drinking Water Rules › Section 3745-81-70 - Monitoring requirements for disinfectant residuals

Current through all regulations passed and filed through July 1, 2024
(A)
								Each public water system required to monitor under this
			 rule shall develop and implement a monitoring plan. The public water system
			 shall maintain the plan and make the plan available for inspection by the
			 director and the general public. All surface water systems serving more than
			 three thousand three hundred people shall submit a copy of the monitoring plan
			 to the director no later than the date of the first report required by rule
			 3745-81-75 of the Administrative
			 Code. The director may also require any other public water system to submit
			 such a plan. After review, the director may require changes in any plan
			 elements. The public water system shall modify the plan as required by the
			 director. The plan shall include at least the specific locations and schedules
			 for collecting samples for any parameters included in this rule, and the plan
			 shall include how the public water system will calculate compliance with
			 maximum residual disinfectant levels (MRDLs). If a public water system is
			 approved for monitoring as a consecutive system, or provides water to a
			 consecutive system under the provisions of rule
			 3745-81-29 of the Administrative
			 Code, its sampling plan shall reflect the entire distribution system. Failure
			 to monitor according to the monitoring plan is a monitoring
			 violation.
(B)
								Public water systems shall take all disinfectant
			 residual samples during normal operating conditions.
(C)
								Failure to
			 perform the required monitoring for total chlorine is a monitoring violation.
			 The public water system will be in violation for the entire period covered by
			 the running annual average.
(D)
								All samples taken
			 and analyzed under the provisions of this rule shall be included in determining
			 compliance, even if that number is greater than the minimum
			 required.
(E)
								This paragraph applies to all community and
			 nontransient noncommunity public water systems that treat their water with
			 chlorine or chloramines for disinfection purposes. The monitoring requirements
			 for total chlorine are as follows:
(1)
									The residual disinfectant level shall be measured at
			 the same points in the distribution system and at the same time as total
			 coliforms are sampled as specified in rules
			 3745-81-51 and
			 3745-81-52 of the Administrative
			 Code.
(2)
									Compliance shall be based on a running annual
			 arithmetic average, computed quarterly, of monthly averages of all samples
			 collected by the system under this rule. For total chlorine a public water
			 system is in compliance with the MRDL when the running annual average of
			 samples taken in the distribution system, computed quarterly, is less than or
			 equal to the MRDL. If the average of the quarterly averages covering any
			 consecutive four-quarter period exceeds the MRDL, the system is in violation of
			 the MRDL and must notify the public according to rule
			 3745-81-32 of the Administrative
			 Code, in addition to reporting to the director according to rule
			 3745-81-75 of the Administrative
			 Code.