Current through Register Vol. 48, No. 38, September 20, 2024
A supplier using a groundwater source under the direct
influence of surface water not providing filtration treatment must report
monthly to the Agency the information this Section specifies beginning six
months after the Agency determines that the groundwater source is under the
direct influence of surface water. When the Agency issues a SEP requiring
filtration treatment and specifying appropriate alternative reporting
requirements until the supplier applies filtration treatment.
a) The supplier must report source water
quality information to the Agency within ten days after the end of each month
the supplier serves water to the public. The information must include certain
information:
1) The cumulative number of
months for which the supplier reports results.
2) The number of fecal or total coliform
samples, whichever the supplier analyzed during the month (if a supplier
monitors for both, the supplier needs only report fecal coliform samples), the
dates the supplied collected the samples, and the dates when the turbidity
level exceeded 1 NTU.
3) The number
of samples during the month that had equal to or fewer than 20/100 ml fecal
coliforms or equal to or fewer than 100/100 ml total coliforms, whichever the
supplier analyzed.
4) The
cumulative number of fecal or total coliform samples, whichever the supplier
analyzed, during the previous six months the supplier served water to the
public.
5) The cumulative number of
samples that had equal to or fewer than 20/100 ml fecal coliforms or equal to
or fewer than 100/100 ml total coliforms, whichever the supplier analyzed,
during the previous six months the supplier served water to the
public.
6) The percentage of
samples that had equal to or fewer than 20/100 ml fecal coliforms or equal to
or fewer than 100/100 ml total coliforms, whichever the supplier analyzed,
during the previous six months the supplier served water to the
public.
7) The maximum turbidity
level the supplier measured during the month, the dates of occurrence for any
measurements exceeding 5 NTU, and the dates the supplier reported the
occurrences to the Agency.
8) For
the first 12 months of recordkeeping, the dates and cumulative number of events
during which the turbidity exceeded 5 NTU. After one year of recordkeeping for
turbidity measurements, the dates and cumulative number of events during which
the turbidity exceeded 5 NTU in the previous 12 months the supplier served
water to the public.
9) For the
first 120 months of recordkeeping, the dates and cumulative number of events
during which the turbidity exceeded 5 NTU. After ten years of recordkeeping for
turbidity measurements, the dates and cumulative number of events during which
the turbidity exceeded 5 NTU in the previous 120 months the supplier served
water to the public.
b)
The supplier must report the Agency disinfection information Section
611.532 specifies within ten
days after the end of each month the supplier serves water to the public. The
information the supplier reports must include specific information:
1) For each day, the lowest RDC measurement
in mg/L in water entering the distribution system.
2) The date and duration of each period
during which the RDC in water entering the distribution system fell below
0.2 mg/L and the supplier
notified the Agency of the occurrence.
3) The daily RDCs (in mg/L) and disinfectant
contact times (in minutes) the supplier used for calculating the CT
values.
4) If the supplier uses
chlorine, the daily pH measurements of disinfected water following each point
of chlorine disinfection.
5) The
daily water temperature measurements (in °C) following each point of
disinfection.
6) The daily
CTcalc and Ai values for each
disinfectant measurement or sequence and the sum of all
Ai values (B) before or at the first customer.
7) The daily determination whether
disinfection achieves adequate Giardia cyst and virus inactivation, i.e.,
whether Ai is at least
1.0. If the supplier uses a
disinfectant other than chlorine, the supplier must use other indicator
conditions the Agency determines appropriate under Section
611.241(a)(1).
8) Specific information on the supplier's
distribution system samples the supplier took for total coliform monitoring
under Sections 611.240 through
611.242:
A) The number of times when the supplier
measured the RDC;
B) The number of
times when the supplier did not measure the RDC but did measure HPC;
C) The number of times the supplier measured
but did not detect RDC and measured HPC;
D) The number of times when the supplier
measured but did not detect the RDC, and the HPC is greater than
500/ml;
E) The number of times when
the supplier did not measure the RDC, and the HPC is greater than
500/ml;
F) For the current and
previous month the supplier served water to the public, the value of "V" in the
following formula:
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here to view image
where:
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a
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=
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The value in subsection (b)(8)(A);
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b
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=
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The value in subsection (b)(8)(B);
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c
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=
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The value in subsection (b)(8)(C);
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d
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=
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The value in subsection (b)(8)(D); and
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e
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=
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The value in subsection (b)(8)(E).
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G)
Subsections (b)(8)(A) through (b)(8)(F) do not apply if the Agency determines,
under Section 611.213, that a supplier has no
means for having a sample analyzed for HPC by a certified laboratory under the
requisite time and temperature conditions specified by Section
611.531(a) and
that the supplier adequately provides disinfection in the distribution
system.
9) A supplier
needs not report the data subsections (b)(1) and (b)(3) through (b)(6) require
if all data subsections (b)(1) through (b)(8) require remain on file at the
system, and the Agency issues a SEP making specific determinations:
A) That the supplier submitted all the
information subsections (b)(1) through (b)(8) require to the Agency for at
least 12 months; and
B) That the
supplier needs not provide filtration treatment.
c) By October 10 of each year,
every supplier must provide a report to the Agency summarizing its compliance
with all watershed control program requirements in Section
611.232(b).
d) By October 10 of each year, every supplier
must provide a report to the Agency on the on-site inspection the supplier
conducted during that year under Section
611.232(c),
unless the Agency conducted the on-site inspection. If the Agency conducted the
inspection, the Agency must provide a copy of its report to the
supplier.
e) Reporting Health
Threats
1) Upon discovering that a waterborne
disease outbreak occurred that is potentially attributable to its water system,
a supplier must report that occurrence to the Agency as soon as possible but no
later than by the end of the next business day.
2) If at any time the turbidity exceeds 5
NTU, the supplier must consult with the Agency as soon as practical, but no
later than 24 hours after the supplier knows of the exceedance, under Section
611.903(b)(3).
3) If at any time the RDC falls below
0.2 mg/L in the water entering
the distribution system, the supplier must notify the Agency as soon as
possible but no later than by the end of the next business day. The supplier
must also notify the Agency by the end of the next business day whether or not
the supplier restored the RDC to at least
0.2 mg/L within four
hours.
BOARD NOTE: This Section derives from
40 CFR
141.75(a).
