Pennsylvania Code › Title 25 - ENVIRONMENTAL PROTECTION › Part I - Department of Environmental Protection › Subpart C - Protection of Natural Resources › Article II - Water Resources › Chapter 109 - SAFE DRINKING WATER › Subchapter B - MCLs, MRDLs OR TREATMENT TECHNIQUE REQUIREMENTS › Section 109.204 - Disinfection profiling and benchmarking

Current through Register Vol. 54, No. 28, July 13, 2024
(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.