Ohio Administrative Code › Title 3745 - Ohio Environmental Protection Agency › Chapter 3745-81 - Primary Drinking Water Rules › Section 3745-81-80 - Control of lead and copper - general requirements

Current through all regulations passed and filed through July 1, 2024
(A) Applicability. The requirements of rules
			 3745-81-80 to
			 3745-81-90
			 of the Administrative Code are based on the national primary drinking water
			 regulations for lead and copper. Unless otherwise indicated, each of the
			 provisions of these rules applies to community water systems and nontransient
			 noncommunity water systems (hereinafter referred to as "water systems" or
			 "systems").
(B) Scope. These
			 regulations establish a treatment technique that includes requirements for
			 corrosion control treatment, source water treatment, lead service line
			 replacement, and public education. Lead and copper action levels, measured in
			 samples collected at consumers' taps, may trigger these requirements.
(C) Lead and copper action levels, and lead threshold levels.
(1) The lead action level is exceeded if, at any time during the monitoring period, the
			 concentration of lead in more than ten per cent of tap water samples collected
			 during any monitoring period conducted in accordance with rule
			 3745-81-86
			 of the Administrative Code is greater than 0.015 milligram per liter, i.e., if
			 the ninetieth percentile lead level is greater than 0.015 milligram per
			 liter.
(2) The copper action level
			 is exceeded if, at any time during the monitoring
			 period, the concentration of copper in more than ten percent of tap water
			 samples collected during any monitoring period conducted in accordance with
			 rule
			 3745-81-86
			 of the Administrative Code is greater than 1.3 milligrams per liter, i.e., if
			 the ninetieth percentile copper level is greater than 1.3 milligrams per
			 liter.
(3) The ninetieth percentile
			 lead and copper levels shall be computed as follows:
(a) The analytical results of all lead or
			 copper samples taken during a monitoring period shall be placed in ascending
			 order from the sample with the lowest concentration to the sample with the
			 highest concentration. Each analytical result shall be assigned a consecutive
			 whole number, beginning with the number one for the sample with the lowest
			 contaminant level. The number assigned to the sample with the highest
			 contaminant level shall be that of the total number of samples analyzed.
(i)
											If less than the
			 minimum number of samples required by rule
			 3745-81-86
			 of the Administrative Code have been taken, the minimum number of samples shall
			 be used in calculations.
(ii)
											If greater than or equal to the minimum number of
			 samples required by rule
			 3745-81-86
			 of the Administrative Code have been taken, the total number of samples shall
			 be used in calculations.
(b) The number of samples taken during the
			 monitoring period shall be multiplied by 0.9.
(c) The contaminant concentration in the
			 numbered sample with the number yielded by the calculation in paragraph
			 (C)(3)(b) of this rule is the ninetieth percentile contaminant level.
If the result of the calculation in
				paragraph (C)(3)(b) of this rule is not a whole number, the concentrations for
				the samples above and below the result shall be iterated to yield the ninetieth
				percentile contaminant level.
(d) For public water systems that monitor
			 five samples per monitoring period, the ninetieth percentile is computed by
			 taking the average for the two samples with highest concentrations.
(e) For public water systems that have been
			 allowed by the director to collect fewer than five samples under rule
			 3745-81-86
			 of the Administrative Code, the sample result with the highest concentration is
			 considered the ninetieth percentile value.
(4)
									The lead
			 threshold level is exceeded at 0.015 milligrams per liter concentration of lead
			 in an individual tap water sample.