Current through Register No. 13, March 27, 2025
Reporting and recordkeeping requirements for system owners
that do not provide filtration shall be as follows:
(a) A public water system owner that uses a
surface water source and does not provide filtration treatment shall report
monthly to the departmentthe information specified below.
(b) A public water system owner that uses a
ground water source under the direct influence of surface water and does not
provide filtration treatment shall report monthly to the department the
information specified belowbeginning 6 months after the department determines
that the ground water source is under the direct influence of surface
water;
(c) Source water quality
information shall be reported to the department within 10 days after the end of
each month that the system serves water to the public as follows:
(1) The cumulative number of months for which
results are reported;
(2) The
number of fecal and total coliform samples, or both, whichever are analyzed
during the month, the dates of sample collection, and the dates when the
turbidity level exceeded 1 NTU;
(3)
If a system owner monitors for both fecal coliforms and total coliforms, only
fecal coliforms shall be reported;
(4) The number of samples during the month
that had equal to or less than 20/100 ml fecal coliforms and equal to or less
than 100/100 ml total coliforms, whichever are analyzed;
(5) The cumulative number of fecal or total
coliform samples, whichever are analyzed, during the previous 6 months the
system served water to the public;
(6) 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 6
months the system served water to the public;
(7) The percentage of samples that had equal
to or less than 20/100 ml fecal coliforms or equal to or less than l00/l00 ml
total coliforms, whichever are analyzed, during the previous 6 months the
system served water to the public;
(8) 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
department;
(9) 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; and
(10) 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;
(d)
Disinfection information specified in
Env-Ws
380.14 shall be reported to the department within 10
days after the end of each month the system serves water to the public as
follows:
(1)For each day, the lowest
measurement of residual disinfectant concentration in mg/l in water entering
the distribution system;
(2) 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
department was notified of the occurrence;
(3) The daily residual disinfectant
concentration(s), in mg/l, and disinfectant contact time(s), in minutes, used
for calculating the CT value(s);
(4) If chlorine is used, the daily
measurement(s) of pH of disinfected water following each point of chlorine
disinfection;
(5) The daily
measurement(s) of water temperature in C following each point of
disinfection;
(6) The daily Ctcalc
and Ctcalc/CT99.9 values for each disinfectant measurement or sequence and the
sum of all Ctcalc/CT99.9 values, [SIGMA] (Ctcalc/CT99.9), before or at the
first customer;
(7) The daily
determination of whether disinfection achieves adequate giardia cyst and virus
inactivation, where disinfectants other than chlorine are used, other indicator
conditions are met;
(8) The
following information on the samples taken in the distribution system in
conjunction with total coliform monitoring pursuant to Env-Ws 325:
a. The number of instances where the residual
disinfectant concentration is measured;
b. The number of instances where the residual
disinfectant concentration is not measured but heterotrophic bacteria plate
count is measured;
c. The number of
instances where the residual disinfectant concentration is measured but not
detected and no HPC is measured;
d.
The number of instances where no residual disinfectant concentration is
detected and where HPC is >500/ml;
e. The number of instances where the residual
disinfectant concentration is not measured and HPC is >500/ml; and
f. For the current and previous month the
system served water to the public, the value of "V" calculated in
Env-Ws
380.10; and
(9) A system owner need not continue to
report the data listed in (d)(1) through (6) above if all data listed in
paragraphs (d)(1) through (8) above remain on file at the system, and the
department determines that:
a. The system
owner has submitted to the department all the information required by (d)(1)
through (8) of this section for at least 12 months; and
b. The system owner is not required to
provide filtration treatment;
(e) No later than 10 days after the end of
each calendar year, each system owner shall provide to the department a report
which summarizes its compliance with all watershed control program requirements
specified in Env-Ws 380.07;
(f) No later than 10 days after the end of
each calendar year, the department shall provide a copy of its report on the
on-site inspection conducted during that year pursuant to
Env-Ws
380.07 to the public water system owner;
(g) Each system owner, upon discovering that
a waterborne disease outbreak potentially attributable to that water system has
occurred, shall report that occurrence to the departmentas soon as possible,
but no later than by the end of the next business day after such
discovery;
(h) If at any time the
turbidity exceeds 5 NTU, the system owner shall inform the department as soon
as possible, but no later than the end of the next business day after such
discovery; and
(i) If at any time
the residual falls below 0.2 mg/l in the water entering the distribution
system, the system owner shall notify the department:
(1) A s soon as possible, but no later than
by the end of the next business day after such discovery; and
(2) By the end of the next business
daywhether the residual was restored to at least 0.2 mg/l within 4
hours.
#5098, eff 3-18-91, EXPIRED 3-18-97
New. #6521, eff 6-4-97 (See
Revision Note at chapter heading for Env-Ws 300); amd by #7754, eff 8-21-02; ss
by #8352, eff 5-14-05 (formerly part of
Env-Ws
380.25)