Compilation of Rules and Regulations of the State of Georgia › Department 391 - RULES OF GEORGIA DEPARTMENT OF NATURAL RESOURCES › Chapter 391-3 - ENVIRONMENTAL PROTECTION › Subject 391-3-5 - RULES FOR SAFE DRINKING WATER › Rule 391-3-5-.53 - Stage 2 Disinfection Byproducts Rule (Stage 2 DBPR)

Current
				through Rules and Regulations filed through June 27, 2024
Purpose.
The Stage 2 Disinfection Byproducts
				  Rule (DBPR) (40 CFR, Subpart
				  V §
										141) builds on existing regulations
				  by requiring water systems to meet disinfection byproduct (DBP) maximum
				  contaminant levels (MCLs) at each monitoring site in the distribution system to
				  better protect public health. The Stage 2 DBPR includes a provision requiring
				  all community water systems (CWS) and only non-transient non-community water
				  systems (NTNCWS) serving more than 10,000 people to conduct an initial
				  distribution system evaluation (IDSE) (40 CFR, Subpart U §
										141).
				  NTNCWS serving less than 10,000 are exempted from IDSE requirements, but will
				  need to comply with the Stage 2 DBPR compliance monitoring requirements. The
				  goal of the IDSE is to characterize the distribution system and identify
				  monitoring sites where customers may be exposed to high levels of total
				  trihalomethanes (TTHM) and haloacetic acids (HAA5).
(1)
Initial Distribution System
				Evaluations.
(a) General requirements:
				The requirements of 40 CFR Part 141Su bpart U constitute national primary
				drinking water regulations. The regulations in 40 CFR Part 141 Subpart U
				establish monitoring and other requirements for identifying 40 CFR Part 141
				Subpart V compliance monitoring locations for determining compliance with
				maximum contaminant levels for total trihalomethanes (TTHM) and haloacetic
				acids (five) (HAA5). A system must use an Initial Distribution System
				Evaluation (IDSE) to determine locations with representative high TTHM and HAA5
				concentrations throughout its distribution system. IDSEs are used in
				conjunction with, but separate from, compliance monitoring per 40 CFR Part 141
				Subpart L, to identify and select compliance monitoring locations per 40 CFR
				Part 141 Subpart V.
(b)
				Applicability: Public water systems are subject to these requirements if the
				water system is a community water system that uses a primary or residual
				disinfectant other than ultraviolet light or delivers water that has been
				treated with a primary or residual disinfectant other than ultraviolet light;
				or if the water system is a non-transient non-community water system that
				serves at least 10,000 people and uses a primary or residual disinfectant other
				than ultraviolet light or delivers water that has been treated with a primary
				or residual disinfectant other than ultraviolet light.
(c) Schedule:
				40 CFR Subpart U §
											141.600(c), in its entirety,
				is hereby incorporated by reference. Systems required to comply with Initial
				Distribution System Evaluations - Subpart U, must comply with the schedule
				specified in the table 40
				CFR §
											141.600(c)(1). A
				wholesale system or a consecutive system must comply with the specified
				schedule at the same time as the system with the earliest compliance date in
				the combined distribution system.
(d)
										40 CFR Subpart U §
											141.600(d) through (f), in
				its entirety, is hereby incorporated by reference.
(e) Standard Monitoring:
				40 CFR Subpart U §
											141.601 is hereby incorporated by reference.
1. Standard monitoring plan:
				40 CFR Subpart U §
												141.601(a) through (c), in
				its entirety, is hereby incorporated by reference.
2. System specific studies:
				40 CFR Subpart U §
												141.602(a) through (b), in
				its entirety, is hereby incorporated by reference.
3. 40/30
				Certification
:
40 CFR Subpart U §
												141.603(a) through (b), in
				its entirety, is hereby incorporated by reference.
4. Very small system waivers: 40 CFR Subpart
				U § 141.604(a) through (b), in its entirety, is hereby incorporated by
				reference.
(f)40 CFR Part
				141 Subpart V Compliance Monitoring Location Recommendations:
				40 CFR Subpart U §
											141.605(a) through (e), in
				its entirety, is hereby incorporated by reference. Water system's IDSE report
				must include the recommendations and justification for where and during what
				month(s) TTHM and HAA5 monitoring for Subpart V of part 141 should be
				conducted. Water system must base its recommendations on the criteria in
				paragraphs (b) through (e) of this section.