§141.75 Reporting and recordkeeping requirements.
(a) A public water system that uses a surface water source and does not
provide filtration treatment must report monthly to the State the information
specified in this paragraph (a) beginning December 31, 1990, unless the State
has determined that filtration is required in writing pursuant to section
1412(b)(7)(C)(iii), in which case the State may specify alternative reporting
requirements, as appropriate, until filtration is in place. A public water
system that uses a ground water source under the direct influence of surface
water and does not provide filtration treatment must report monthly to the State
the information specified in this paragraph (a) beginning December 31, 1990, or
6 months after the State determines that the ground water source is under the
direct influence of surface water, whichever is later, unless the State has
determined that filtration is required in writing pursuant to
§1412(b)(7)(C)(iii), in which case the State may specify alternative reporting
requirements, as appropriate, until filtration is in place.
(1) Source water quality information must be reported to the State within 10
days after the end of each month the system serves water to the public.
Information that must be reported includes:
(i) The cumulative number of months for which results are reported.
(ii) The number of fecal and/or total coliform samples, whichever are
analyzed during the month (if a system monitors for both, only fecal coliforms
must be reported), the dates of sample collection, and the dates when the
turbidity level exceeded 1 NTU.
(iii) The number of samples during the month that had equal to or less than
20/100 ml fecal coliforms and/or equal to or less than 100/100 ml total
coliforms, whichever are analyzed.
(iv) The cumulative number of fecal or total coliform samples, whichever are
analyzed, during the previous six months the system served water to the public.
(v) The cumulative number of samples that had equal to or less than 20/100 ml
fecal coliforms or equal to or less than 100/100 ml total coliforms, whichever
are analyzed, during the previous six months the system served water to the
public.
(vi) The percentage of samples that had equal to or less than 20/100 ml fecal
coliforms or equal to or less than 100/100 ml total coliforms, whichever are
analyzed, during the previous six months the system served water to the public.
(vii) The maximum turbidity level measured during the month, the date(s) of
occurrence for any measurement(s) which exceeded 5 NTU, and the date(s) the
occurrence(s) was reported to the State.
(viii) For the first 12 months of recordkeeping, the dates and cumulative
number of events during which the turbidity exceeded 5 NTU, and 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
system served water to the public.
(ix) For the first 120 months of recordkeeping, the dates and cumulative
number of events during which the turbidity exceeded 5 NTU, and after 10 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
system served water to the public.
(2) Disinfection information specified in §141.74(b) must be reported to the
State within 10 days after the end of each month the system serves water to the
public. Information that must be reported includes:
(i) For each day, the lowest measurement of residual disinfectant
concentration in mg/l in water entering the distribution system.
(ii) The date and duration of each period when the residual disinfectant
concentration in water entering the distribution system fell below 0.2 mg/l and
when the State was notified of the occurrence.
(iii) The daily residual disinfectant concentration(s) (in mg/l) and
disinfectant contact time(s) (in minutes) used for calculating the CT value(s).
(iv) If chlorine is used, the daily measurement(s) of pH of disinfected water
following each point of chlorine disinfection.
(v) The daily measurement(s) of water temperature in °C following each point
of disinfection.
(vi) The daily CTcalc and CTcalc/CT99.9 values for each
disinfectant measurement or sequence and the sum of all CTcalc/CT99.9
values ((CTcalc/CT99.9)) before or at the first customer.
(vii) The daily determination of whether disinfection achieves adequate
Giardia cyst and virus inactivation, i.e., whether (CTcalc/CT99.9) is at least 1.0 or, where disinfectants other than chlorine are
used, other indicator conditions that the State determines are appropriate, are
met.
(viii) The following information on the samples taken in the distribution
system in conjunction with total coliform monitoring pursuant to §141.72:
(A) Number of instances where the residual disinfectant concentration is
measured;
(B) Number of instances where the residual disinfectant concentration is not
measured but heterotrophic bacteria plate count (HPC) is measured;
(C) Number of instances where the residual disinfectant concentration is
measured but not detected and no HPC is measured;
(D) Number of instances where the residual disinfectant concentration is
detected and where HPC is >500/ml;
(E) Number of instances where the residual disinfectant concentration is not
measured and HPC is >500/ml;
(F) For the current and previous month the system served water to the public,
the value of "V" in the following formula:
