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 C - MONITORING REQUIREMENTS › Section 109.303 - Sampling requirements

Current through Register Vol. 54, No. 28, July 13, 2024
(a) The
						samples taken to determine a public water system's compliance with MCLs, MRDLs
						or treatment technique requirements or to determine compliance with monitoring
						requirements shall be taken at the locations identified in §§
												109.301, 109.302, 109.1003,
						109.1103, 109.1202 and 109.1303 and as follows:
(1) Samples for determining compliance with
						the turbidity MCL shall be taken at each entry point associated with a surface
						water source that the Department has determined shall be filtered.
(2) Samples for determining compliance with
						the
E. coli
MCL under
						109.202(a)(2)
						(relating to State MCLs, MRDLs and treatment technique requirements) and for
						determining whether an assessment is triggered under
						109.202(c)(4)
						shall be taken at regular intervals throughout the monitoring period at sites
						which are representative of water throughout the distribution system according
						to a written sample siting plan as specified under
						109.701(a)(5)
						(relating to reporting and recordkeeping). Representative locations include,
						but are not limited to, the following:
(i)
						Dead ends.
(ii) First service
						connection.
(iii) Finished water
						storage facilities.
(iv)
						Interconnections with other public water systems.
(v) Areas of high water age.
(vi) Areas with previous coliform
						detections.
(3) Samples
						for determining compliance with the fluoride MCL shall be taken at each entry
						point.
(4) Samples for determining
						compliance with MCLs for organic contaminants listed by the EPA under
						40 CFR
						141.61 (relating to maximum contaminant
						levels for organic contaminants), inorganic contaminants listed by the EPA
						under 40 CFR
						141.62 (relating to maximum contaminant
						levels for inorganic contaminants), and radionuclide contaminants listed by the
						EPA under 40 CFR
						141.66 (relating to maximum contaminant
						levels for radionuclides) shall be taken at each entry point to the
						distribution system which is representative of each source after an application
						of treatment during periods of normal operating conditions. If a system draws
						water from more than one source and the sources are combined prior to
						distribution, the system shall sample at the entry point during periods of
						normal operating conditions when water is representative of all sources being
						used.
(5) Asbestos sampling points
						shall be at the distribution tap where asbestos contamination is expected to be
						the greatest based on the presence of asbestos cement pipe and lack of optimum
						corrosion control treatment, and at the entry point for each source which the
						Department has reason to believe may contain asbestos, except that a collected
						distribution sample which is representative of a source may be substituted for
						a required entry point sample.
(6)
						Samples for determining compliance with MCLs for PFAS contaminants listed in
						§
													109.202(a)(4)
						shall be collected at each entry point to the distribution system which is
						representative of each source after an application of treatment during periods
						of normal operating conditions. If a system draws water from more than one
						source and the sources are combined prior to distribution, the system shall
						sample at the entry point during periods of normal operating conditions when
						water is representative of all sources being used.