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 L - LONG-TERM 2 ENHANCED SURFACE WATER TREATMENT RULE › Section 109.1202 - Monitoring requirements

Current through Register Vol. 54, No. 28, July 13, 2024
(a)
Initial round of source water monitoring.
A system shall
						conduct the following monitoring on the schedule in subsection (c) unless it
						meets the monitoring exemption criteria in subsection (d):
(1) Filtered systems serving at least 10,000
						people shall sample their source water for
Cryptosporidium, E.
						coli
and turbidity at least monthly for 24 months.
(2) Unfiltered systems serving at least
						10,000 people shall sample their source water for
Cryptosporidium
at least monthly for 24 months.
(3) Filtered systems serving less than 10,000
						people shall sample their source water for
E. coli
at least
						once every 2 weeks for 12 months. A filtered system serving less than 10,000
						people may avoid
E. coli
monitoring if the system notifies the
						Department that it will monitor for
Cryptosporidium
as
						described in paragraph (4). The system shall notify the Department no later
						than 3 months prior to the date the system is otherwise required to start
E. coli
monitoring under subsection (c).
(4) Filtered systems serving less than 10,000
						people shall sample their source water for
Cryptosporidium
at
						least twice per month for 12 months or at least monthly for 24 months if they
						meet one of the following subparagraphs, based on monitoring conducted under
						paragraph (3):
(i) For systems using
						lake/reservoir sources, the annual mean
E. coli
concentration
						is greater than 100
E. coli
/100 mL.
(ii) For systems using flowing stream
						sources, the annual mean
E. coli
concentration is greater than
						100
E. coli
/100 mL.
(iii) The system does not conduct
E.
						coli
monitoring as described in paragraph (3).
(iv) Systems using groundwater sources under
						the direct influence of surface water (GUDI) shall comply with this paragraph
						based on the
E. coli
level that applies to the nearest surface
						water body. If no surface water body is nearby, the system shall comply based
						on the requirements that apply to systems using lake/reservoir
						sources.
(5) For filtered
						systems serving less than 10,000 people, the Department may approve monitoring
						for an indicator other than
E. coli
under paragraph (3). The
						Department also may approve an alternative to the
E. coli
concentration in paragraph (4)(i), (ii) or (iv) to trigger
Cryptosporidium
monitoring. This approval by the Department
						would be based on EPA-supported research indicating the validity of an
						alternative to
E. coli
. The Department will provide this
						approval to the system in writing and will include the basis for the
						Department's determination that the alternative indicator, trigger level, or
						both, will provide a more accurate identification of whether a system will
						exceed the Bin 1
Cryptosporidium
level in §
													109.1203(c) 
						(relating to bin classification and treatment technique
						requirements).
(6) Unfiltered
						systems serving less than 10,000 people shall sample their source water for
Cryptosporidium
at least twice per month for 12 months or at
						least monthly for 24 months.
(7)
						Systems may sample more frequently than required under this section if the
						sampling frequency is evenly spaced throughout the monitoring period.