Current through Register No. 13, March 27, 2025
(a) Pursuant to
40 CFR
141.503(g), beginning
January 14, 2005, in addition to the reporting and recordkeeping requirements
in Env-Ws
380.21, the owner of a public water system providing
conventional filtration treatment or direct filtration, shall report monthly to
the department the information specified in (c) and (e) below.
(b) In addition to the reporting and
recordkeeping requirements in
Env-Ws
380.21, the owner of a public water system that
provides filtration approved under Env-Ws 380. 27 shall report monthly to the
department the information specified in (c) below.
(c) A system owner shall report turbidity
measurements required by Env-Ws 380. 27 to the department within 10 days after
the end of each month the system serves water to the public.
(d) The reporting in (c) above, shall be in
lieu of the reporting specified in
Env-Ws
380.21.
(e) The turbidity measurement report
identified in (c) above, shall include:
(1)
The total number of filtered water turbidity measurements taken during the
month;
(2) 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 Env-Ws 380.2
7 (b); and
(3) The date and value
of any turbidity measurements taken during the month which exceed one NTU for
systems using conventional filtration treatment or direct filtration, or which
exceed the maximum level set by the department under Env-Ws 380.2
7(g).
(f) A system owner
shall maintain the results of individual filter monitoring taken under Env-Ws
380.2 7 for at least 3 years.
(g) A
system owner shall report to the department that it has conducted individual
filter turbidity monitoring under Env-Ws 380.2 7 within 10 days after the end
of each month the system serves water to the public.
(h) A system owner shall report to the
department individual filter turbidity measurement results taken under Env-Ws
380.2 7within 10 days after the end of each month the system serves water to
the public only if measurements demonstrate one or more of the conditions
identified in (l)(1) through (l)(10) below.
(i) The owner of a system that uses lime
softening may submit to the department a written request to exceed the levels
specified in (l)(1) through (l)(9) below.
(j) The written request shall include:
(2) The system EPA number; and
(3) Documentation that the turbidity levels
in individual filters are due to lime carryover only and not due to degraded
filter performance.
(k)
The department shall respond to the request in writing and shall approve the
request if the system demonstrates that higher turbidity levels in individual
filters are due to lime carryover only and not due to degraded filter
performance.
(l) The system owner
shall report to the department individual filter turbidity as follows:
(1) For any individual filter, or for systems
serving fewer than 10,000 people with 2 filters that monitor combined filter
effluent in lieu of individual filters, that has a measured turbidity level of
greater than 1.0 NTU in 2 consecutive measurements taken 15 minutes apart, the
system owner shall report:
b. The turbidity
measurement;
c. The date(s) and
times on which the exceedance occurred; and
d. The cause, if known, for the
exceedance;
(2) If the
system is not able to identify an obvious reason for the abnormal filter
performance:
a. A filter profile for the
filter within 7 days of the exceedance; and
b. Report to the department that the filter
profile has been produced;
(3) For any individual filter that has a
measured turbidity level of greater than 0.5 NTU in 2 consecutive measurements
taken 15 minutes apart at the end of the first 4 hours of continuous filter
operation after the filter has been backwashed or otherwise taken offline:
b. Turbidity measurement; and
c. Date(s) and times on which the exceedance
occurred;
(4) A system
owner shall produce:
a. A filter profile for
the filter within 7 days of the exceedance if the system is not able to
identify a reason for the abnormal filter performance; and
b. Report to the department that the filter
profile has been produced; or
c.
Report the reason for the exceedance.
(5) For any individual filter, or for systems
serving fewer than 10,000 people with 2 filters that monitor combined filter
effluent in lieu of individual filters, that has a measured turbidity level of
greater than 1.0 NTU in 2 consecutive measurements taken 15 minutes apart at
any time in each of 3 consecutive months, the system owner shall report to the
department the:
b. Turbidity measurement; and
c. Date(s) and times on which the exceedance
occurred;
(6) The system
owner identified in (l) (5) above, shall:
a.
Conduct an assessment, as in (p) below, of the filter within 14 days of the
exceedance if a CPE as specified in (q) below, is not required;
b. Submit the assessment by the tenth of the
following month unless the assessment was triggered during the last four days
of the month then 14 days would apply.
c. In addition, systems serving fewer than
10,000 with 2 filters that monitor CPE in lieu of individual filters shall
conduct an assessment on both filters; and
d. Report to the department that the
assessment was conducted;
(7) For any individual filter, or systems
serving fewer than 10,000 with 2 filters that monitor combined filter effluent
in lieu of individual filters, that has a measured turbidity level of greater
than 2.0 NTU in 2 consecutive measurements taken 15 minutes apart at any time
in each of 2 consecutive months, the system owner shall report to the
department the:
b. Turbidity measurement; and
c. Date(s) on which the exceedance
occurred;
(8) The owner
of a system serving at least 10,000 people identified in (7) above shall:
a. Arrange for a CPE by the department, no
later than 30 days following the exceedance informing the department the CPE is
required and the date that it was triggered; and
b. Have the evaluation completed and
submitted to the department no later than 90 days following the
exceedance;
(9) The
owner of a system serving less than 10,000 people identified in (7) above
shall:
a. Arrange for a CPE by the
department, no later than 60 days following the exceedance informing the
department the CPE is required and the date that it was triggered;
and
b. Have the evaluation
completed and submitted to the department no later than 120 days following the
exceedance;
(10) If a
CPE has been completed by the department or a third party approved by the
department as stated in (m) through (o) below within the 12 prior months or the
system and department are jointly participating in an ongoing CTA project at
the system, a new CPE shall not be required.
(m) A system owner in (l)(8) above may submit
to the department a written request to use a third party to perform the
CPE.
(n) The written request shall
include:
(2) The system EPA number; and
(3) The name, address, and telephone number
of the person performing the CPE.
(o) The department shall respond to the
request in writing and shall approve the third party request if the third party
meets the criteria set forth in Env-Ws 601.05.
(p) The assessment required under (l)(6)
above, shall include the following:
(1) An
assessment of filter performance;
(2) A development of a filter
profile;
(3) An identification and
prioritization of factors limiting filter performance;
(4) An assessment of the applicability of
corrections;
(5) A filter
assessment report; and
(6) The date
that the assessment was triggered and the date that it was completed.
(q) A CPE required in (l)(8)
above, shall include the following:
(1) An
assessment of plant performance;
(2) An evaluation of major unit
processes;
(3) An identification
and prioritization of performance limiting factors; and
(4) An assessment of the applicability of
CTA.
(r) If at any time
the turbidity level exceeds 1 NTU in representative samples of filtered water
in a system using conventional filtration treatment or direct filtration, the
system owner shall notify the department as soon as possible but no later than
24 hours after the exceedance is known.
(s) If at any time the turbidity level in
representative samples of filtered water exceeds 5 NTU for filtration
treatments other than conventional filtration treatment and direct filtration
the system owner shall inform the department as soon as possible, but no later
than 24 hours after the exceedance is known.
(t) If a system is subject to disinfection
profiling pursuant to
Env-Ws
380.24 and
Env-Ws
380.25, the system shall report the following
information:
(1) Results of optional
monitoring which show TTHM levels < 0.064 mg/L and HAA5 levels < 0.048
mg/L if the system wishes to forgo profiling, or that the system has begun
disinfection profiling by:
a. Pursuant to
40 CFR
141.532(a), beginning July
1, 2003 for systems serving 500-9,999; and
b. Pursuant to
40 CFR
141.532(a), beginningJanuary
1, 2004 for systems serving fewer than 500.
(u) A system owner shall maintain the results
of a disinfection profile, including raw data and analysis,
indefinitely.
(v) If a system is
subject to disinfection benchmarking requirements set forth
Env-Ws
380.26, the system shall report the following
information to the department prior to the system changing its disinfection
practice:
(1) A description of the proposed
change in disinfection;
(2) T he
system's disinfection profile for giardia lamblia and disinfection benchmark;
and
(3) An analysis of how the
proposed change will affect the current levels of disinfection.
(w) A system owner shall maintain
the results of a disinfection benchmark, including raw data and analysis,
indefinitely.
#7754, eff 8-21-02; ss by #8352, eff 5-14-05 (formerly
part of Env-Ws 380.30)
