[Code of Federal Regulations]
[Title 40, Volume 22]
[Revised as of July 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR141.75]

[Page 459-462]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 141_NATIONAL PRIMARY DRINKING WATER REGULATIONS--Table of Contents
 
                  Subpart H_Filtration and Disinfection
 
Sec. 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 Sec. 
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 Sec. 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

[[Page 460]]

water following each point of chlorine disinfection.
    (v) The daily measurement(s) of water temperature in [deg]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 Sec. 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:
[GRAPHIC] [TIFF OMITTED] TC15NO91.136

where:

a=the value in paragraph (a)(2)(viii)(A) of this section,
b=the value in paragraph (a)(2)(viii)(B) of this section,
c=the value in paragraph (a)(2)(viii)(C) of this section,
d=the value in paragraph (a)(2)(viii)(D) of this section, and
e=the value in paragraph (a)(2)(viii)(E) of this section.

    (G) If the State determines, based on site-specific considerations, 
that a system has no means for having a sample transported and analyzed 
for HPC by a certified laboratory under the requisite time and 
temperature conditions specified by Sec. 141.74(a)(1) and that the 
system is providing adequate disinfection in the distribution system, 
the requirements of paragraph (a)(2)(viii) (A)-(F) of this section do 
not apply to that system.
    (ix) A system need not report the data listed in paragraphs (a)(2) 
(i), and (iii)-(vi) of this section if all data listed in paragraphs 
(a)(2) (i)-(viii) of this section remain on file at the system, and the 
State determines that:
    (A) The system has submitted to the State all the information 
required by paragraphs (a)(2) (i)-(viii) of this section for at least 12 
months; and
    (B) The State has determined that the system is not required to 
provide filtration treatment.
    (3) No later than ten days after the end of each Federal fiscal year 
(September 30), each system must provide to the State a report which 
summarizes its compliance with all watershed control program 
requirements specified in Sec. 141.71(b)(2).
    (4) No later than ten days after the end of each Federal fiscal year 
(September 30), each system must provide to the State a report on the 
on-site inspection conducted during that year pursuant to Sec. 
141.71(b)(3), unless the on-site inspection was conducted by the State. 
If the inspection was conducted by the State, the State must provide a 
copy of its report to the public water system.
    (5)(i) Each system, upon discovering that a waterborne disease 
outbreak potentially attributable to that water system has occurred, 
must report that occurrence to the State as soon as possible, but no 
later than by the end of the next business day.
    (ii) If at any time the turbidity exceeds 5 NTU, the system must 
consult with the primacy agency as soon as practical, but no later than 
24 hours after the exceedance is known, in accordance with the public 
notification requirements under Sec. 141.203(b)(3).
    (iii) If at any time the residual falls below 0.2 mg/l in the water 
entering the distribution system, the system must notify the State as 
soon as possible,

[[Page 461]]

but no later than by the end of the next business day. The system also 
must notify the State by the end of the next business day whether or not 
the residual was restored to at least 0.2 mg/l within 4 hours.
    (b) A public water system that uses a surface water source or a 
ground water source under the direct influence of surface water and 
provides filtration treatment must report monthly to the State the 
information specified in this paragraph (b) beginning June 29, 1993, or 
when filtration is installed, whichever is later.
    (1) Turbidity measurements as required by Sec. 141.74(c)(1) must be 
reported within 10 days after the end of each month the system serves 
water to the public. Information that must be reported includes:
    (i) The total number of filtered water turbidity measurements taken 
during the month.
    (ii) The number and percentage of filtered water turbidity 
measurements taken during the month which are less than or equal to the 
turbidity limits specified in Sec. 141.73 for the filtration technology 
being used.
    (iii) The date and value of any turbidity measurements taken during 
the month which exceed 5 NTU.
    (2) Disinfection information specified in Sec. 141.74(c) 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 following information on the samples taken in the 
distribution system in conjunction with total coliform monitoring 
pursuant to Sec. 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 no 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 serves water to 
the public, the value of ``V'' in the following formula:
[GRAPHIC] [TIFF OMITTED] TC15NO91.137

where:

a=the value in paragraph (b)(2)(iii)(A) of this section,
b=the value in paragraph (b)(2)(iii)(B) of this section,
c=the value in paragraph (b)(2)(iii)(C) of this section,
d=the value in paragraph (b)(2)(iii)(D) of this section, and
e=the value in paragraph (b)(2)(iii)(E) of this section.

    (G) If the State determines, based on site-specific considerations, 
that a system has no means for having a sample transported and analyzed 
for HPC by a certified laboratory within the requisite time and 
temperature conditions specified by Sec. 141.74(a)(1) and that the 
system is providing adequate disinfection in the distribution system, 
the requirements of paragraph (b)(2)(iii) (A)-(F) of this section do not 
apply.
    (iv) A system need not report the data listed in paragraph (b)(2)(i) 
of this section if all data listed in paragraphs (b)(2) (i)-(iii) of 
this section remain on file at the system and the State determines that 
the system has submitted all the information required by paragraphs 
(b)(2) (i)-(iii) of this section for at least 12 months.
    (3)(i) Each system, upon discovering that a waterborne disease 
outbreak potentially attributable to that water system has occurred, 
must report that occurrence to the State as soon as possible, but no 
later than by the end of the next business day.
    (ii) If at any time the turbidity exceeds 5 NTU, the system must 
consult

[[Page 462]]

with the primacy agency as soon as practical, but no later than 24 hours 
after the exceedance is known, in accordance with the public 
notification requirements under Sec. 141.203(b)(3).
    (iii) If at any time the residual falls below 0.2 mg/l in the water 
entering the distribution system, the system must notify the State as 
soon as possible, but no later than by the end of the next business day. 
The system also must notify the State by the end of the next business 
day whether or not the residual was restored to at least 0.2 mg/l within 
4 hours.

[54 FR 27527, June 29, 1989, as amended at 65 FR 26022, May 4, 2000; 69 
FR 38856, June 29, 2004]