25 Pa. Code § 109.204 - Disinfection profiling and benchmarking
(a) The disinfection profiling and
benchmarking requirements, established by the EPA under the National Primary
Drinking Water Regulations in
40 CFR
141.172,
141.530-141.536,
141.540-141.544,
141.570(c)
and (d),
141.708 and
141.709 are incorporated by
reference except as otherwise established by this chapter.
(b) Public water suppliers that did not
conduct TTHM and HAA5 monitoring under this section because they served fewer
than 10,000 persons when the monitoring was required, but serve 10,000 or more
persons before January 1, 2005, shall comply with this section. These suppliers
shall also establish a disinfection benchmark.
(c) The public water supplier shall conduct
disinfection profiling in accordance with the procedures and methods in the
most current edition of the Disinfection Profiling and Benchmarking
Guidance Manual published by the EPA. The results of the disinfection
profiling and the benchmark, including raw data and analysis, shall be retained
indefinitely on the water system premises or at a convenient location near the
premises. Public water suppliers serving 10,000 or more persons and required to
conduct disinfection profiling shall submit the disinfection profiling data and
the benchmark data to the Department by June 1, 2001, in a format acceptable to
the Department. Public water suppliers serving 500 to 9,999 persons shall
submit the disinfection profiling data and the benchmark to the Department by
October 1, 2004. Public water suppliers serving less than 500 persons shall
submit the disinfection profiling data and the benchmark to the Department by
April 1, 2005, in a format acceptable to the Department.
(d) A public water supplier that obtains a
permit or permit modification for filtration treatment for a surface water or
GUDI source after August 18, 2018, shall submit documentation with the permit
application relative to operational parameters which will be used to maintain
Giardia lamblia inactivation throughout the expected range of
operating conditions.
(e) A public
water supplier using surface water or GUDI sources shall consult with the
Department before making a significant change to its disinfection practice or
operating treatment processes in a manner that may result in an inactivation
level that is lower than the level needed to meet the Giardia
lamblia inactivation requirements specified in §
109.202(c)(1)(ii)
(relating to State MCLs, MRDLs and treatment technique requirements). As part
of the consultation, the water supplier shall submit the following information
to the Department:
(1) A completed
disinfection profile and disinfection benchmark for Giardia
lamblia and viruses.
(2) A
description of the proposed change.
(3) An analysis of how the proposed change
will affect the current level of disinfection.
Notes
The provisions of this § 109.204 amended under section 4(a) of the Pennsylvania Safe Drinking Water Act (35 P.S. § 721.4(a)); and section 1920-A(b) of The Administrative Code of 1929 (71 P.S. § 510-20(b)).
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