Indiana Administrative Code
Title 327 - WATER POLLUTION CONTROL DIVISION
Article 8 - PUBLIC WATER SUPPLY
Rule 2 - Drinking Water Standards
Section 2-39 - Monitoring requirements for lead and copper in source water
Universal Citation: 327 IN Admin Code 2-39
Current through September 18, 2024
Authority: IC 13-13-5; IC 13-14-8-7; IC 13-14-9; IC 13-18-3; IC 13-18-16
Affected: IC 13-18
Sec. 39.
(a) Requirements for sample location, collection methods, and number of samples shall be as follows:
(1) A water system that
fails to meet the lead or copper action level on the basis of tap samples
collected in accordance with section 37 of this rule shall collect lead and
copper source water samples in accordance with the following requirements
regarding sample location, number of samples, and collection methods:
(A) Ground water systems shall take a minimum
of one (1) sample at every entry point to the distribution system that is
representative of each well after treatment. This is called a sampling point.
The system shall take one (1) sample at the same sampling point unless
conditions make another sampling point more representative of each source or
treatment plant.
(B) Surface water
systems, or systems with a combination of ground and surface water sources,
shall take a minimum of one (1) sample:
(i)
at every entry point to the distribution system after any application of
treatment; or
(ii) in the
distribution system at a point that is representative of each source after
treatment. This is called a sampling point.
The system shall take each sample at the same sampling point unless conditions make another sampling point more representative of each source or treatment plant.
(C) If:
(i)
a system draws water from more than one (1) source; and
(ii) the sources are combined before
distribution; the system must sample at an entry point to the distribution
system during periods of normal operating conditions when water representative
of all sources is being used.
(D) The commissioner may reduce the total
number of samples that must be analyzed by allowing the use of compositing
according to the following:
(i) Compositing
of samples must be done by certified laboratory personnel.
(ii) Composite samples from a maximum of five
(5) samples are allowed, provided that if the lead concentration in the
composite sample is greater than one-thousandth (0.001) milligram/liter (mg/L)
or the copper concentration is greater than one hundred sixty-thousandths
(0.160) mg/L, then either of the following shall be done:
(AA) A follow-up sample shall be taken and
analyzed within fourteen (14) days at each sampling point used in the
composite.
(BB) If duplicates of or
sufficient quantities from the original samples from each sampling point used
in the composite are available, the system may use these instead of
resampling.
(2) Where the results of sampling indicate
the maximum permissible source water levels established under section 42(b)(4)
of this rule have been exceeded, the commissioner may require that one (1)
additional sample be collected as soon as possible after the initial sample was
taken (but not to exceed two (2) weeks) at the same sampling point. The
additional sample shall meet the following:
(A) If a confirmation sample required by the
commissioner is taken for lead or copper, then the results of the initial and
confirmation sample shall be averaged in determining compliance with the
maximum permissible levels specified by the commissioner.
(B) Any sample value below the detection
limit shall be considered to be zero (0).
(C) Any value above the detection limit but
below the practical quantitation level shall either be considered as:
(i) the measured value; or
(ii) one-half (1/2) the practical
quantitation level.
(b) Any system that exceeds the lead or copper action level at the tap shall collect one (1) source water sample from each entry point to the distribution system not later than six (6) months after the end of the monitoring period during which the lead or copper action level was exceeded. For monitoring periods that are annual or less frequent, the end of the monitoring period is:
(1) September 30
of the calendar year in which the sampling occurs; or
(2) the last day of an alternate monitoring
period, if one is specified by the commissioner.
(c) Any system that installs source water treatment under STEP THREE of section 42(a) of this rule shall collect an additional source water sample from each entry point to the distribution system during two (2) consecutive six (6) month monitoring periods by the deadline specified in STEP FOUR of section 42(a) of this rule.
(d) Requirements for monitoring frequency after the commissioner specifies maximum permissible source water levels or determines that source water treatment is not needed shall be as follows:
(1) A system shall monitor at the frequency
specified as follows in cases where the commissioner specifies maximum
permissible source water levels under STEP FOUR of section 42(a) of this rule
or determines that the system is not required to install source water treatment
under STEP TWO of section 42(a) of this rule:
(A) A water system using only ground water
shall collect samples once during the three (3) year compliance period (as that
term is defined in section 1(14) of this rule) in effect when the applicable
determination under this subdivision and section 42 of this rule is made by the
commissioner. The system shall collect samples once during each subsequent
compliance period. Triennial samples must be collected every third calendar
year.
(B) A water system using
surface water (or a combination of surface and ground water) shall collect
samples once during each year, the first annual monitoring period to begin
during the year in which the applicable determination is made under this
subdivision and section 42 of this rule.
(2) A system is not required to conduct
source water sampling for lead or copper, or both, if the system meets the
action level for the specific contaminant in tap water samples during the
entire source water sampling period applicable to the system under subdivision
(1).
(e) Requirements for reduced monitoring frequency shall be as follows:
(1) A water system using only ground water
may reduce the monitoring frequency for lead and copper to once during each
nine (9) year compliance cycle (as that term is defined in section 1(13) of
this rule) provided the samples are collected not later than every ninth
calendar year if the system meets one (1) of the following criteria:
(A) The system demonstrates that the finished
drinking water entering the distribution system has been maintained below the
maximum permissible lead and copper concentrations specified by the
commissioner in section 42(b)(4) of this rule during at least three (3)
consecutive compliance periods under subsection (d)(1).
(B) The commissioner has determined under
section 42(b)(2) of this rule that source water treatment is not needed and the
system demonstrates that, during at least three (3) consecutive compliance
periods in which sampling was conducted under subsection (d)(1), the
concentration of:
(i) lead in source water
was less than or equal to five-thousandths (0.005) mg/L; and
(ii) copper in source water was less than or
equal to sixty-five hundredths (0.65) mg/L.
(2) A water system using surface water (or a
combination of surface water and ground water) may reduce the monitoring
frequency in subsection (d)(1) to once during each nine (9) year compliance
cycle (as that term is defined in section 1(13) of this rule) if the system
meets one (1) of the following criteria:
(A)
The system demonstrates that the finished drinking water entering the
distribution system has been maintained below the maximum permissible lead and
copper concentrations specified by the commissioner in section 42(b)(4) of this
rule for at least three (3) consecutive years.
(B) The commissioner has determined under
section 42(b)(2) of this rule that source water treatment is not needed and the
system demonstrates that, during at least three (3) consecutive years, the
concentration of:
(i) lead in source water
was less than or equal to five-thousandths (0.005) mg/L; and
(ii) copper in source water was less than or
equal to sixty-five hundredths (0.65) mg/L.
(3) A water system that uses a new source of
water is not eligible for reduced monitoring for:
(A) lead;
(B) copper; or
(C) both lead and copper;
until concentrations in samples collected from the new source during three (3) consecutive monitoring periods are below the maximum permissible lead and copper concentrations specified by the commissioner in STEP FIVE of section 42(a) of this rule.
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