Hawaii Administrative Rules › Title 11 - DEPARTMENT OF HEALTH › Subtitle 1 - GENERAL DEPARTMENTAL PROVISIONS › Chapter 20 - RULES RELATING TO PUBLIC WATER SYSTEMS › Section 11-20-45.2 - Initial Distribution System Evaluations

Current through June, 2024
(a) General
				requirements.
(1) The requirements of this
				section constitute national primary drinking water regulations. The regulations
				in this section establish monitoring and other requirements for identifying
				Stage 2 Disinfection Byproduct compliance monitoring locations for determining
				compliance with maximum contaminant levels for total trihalomethanes (TTHM) and
				haloacetic acids (five)(HAA5). You must use an Initial Distribution System
				Evaluation (IDSE) to determine locations with representative high TTHM and HAA5
				concentrations throughout your distribution system. IDSEs are used in
				conjunction with, but separate from, section
				11-20-45.1
				compliance monitoring, to identify and select Stage 2 Disinfection Byproduct
				compliance monitoring locations.
(2)
				 Applicability. You are subject to these requirements if your
				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 your
				system is a nontransient noncommunity 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.
(3)
				Schedule. You must comply with the requirements of this section on the schedule
				in the following table.
If you serve this population
You must submit your standard monitoring plan or
							 system specific study plan1 or 40/30 certificati
							 on2 to the State by or receive very small system
							 waiver from the State
You must complete your standard monitoring or system
							 specific study by
You must submit your IDSE report to the State
							 by3
Systems that are not part of a combined distribution
							 system and systems that serve the largest population in the combined
							 distribution system
>=100,000
October 1, 2006
September 30, 2008
January 1, 2009
50,000-99,999
April 1, 2007
March 31, 2009
July 1, 2009
10,000-49,999
October 1, 2007
September 30, 2009
January 1, 2010
<10,000(CWS only)
April 1, 2008
March 31, 2010
July 1, 2010
Other systems that are part of a combined
							 distribution system
Wholesale system or consecutive system
-at the same time as the system with the earliest
							 compliance date in the combined distribution system
-at the same time as the system with the earliest
							 compliance date in the combined distribution system
-at the same time as the system with the earliest
							 compliance date in the combined distribution system
1If, within 12 months after the
				  date identified in this column, the State does not approve your plan or notify
				  you that it has not yet completed its review, you may consider the plan that
				  you submitted as approved. You must implement that plan and you must complete
				  standard monitoring or a system specific study no later than the date
				  identified in the third column.
2You must submit your 40/30
				  certification under subsection (d) by the date indicated.
3If, within three months after the
				  date identified in this column (nine months after the date identified in this
				  column if you must comply on the schedule with a service population of between
				  10,000 and 49,999), the State does not approve your IDSE report or notify you
				  that it has not yet completed its review, you may consider the report that you
				  submitted as approved and you must implement the recommended Stage 2
				  Disinfection Byproduct monitoring as required.
For the purpose of the schedule in this paragraph, the State
				  may determine that the combined distribution system does not include certain
				  consecutive systems based on factors such as receiving water from a wholesale
				  system only on an emergency basis or receiving only a small percentage and
				  small volume of water from a wholesale system. The State may also determine
				  that the combined distribution system does not include certain wholesale
				  systems based on factors such as delivering water to a consecutive system only
				  on an emergency basis or delivering only a small percentage and small volume of
				  water to a consecutive system.
(4)
				 You must conduct standard monitoring that meets the requirements
				in subsection (b), or a system specific study that meets the requirements in
				subsection (c), or certify to the State that you meet 40/30 certification
				criteria under subsection (d), or qualify for a very small system waiver under
				subsection (e).
(A) You must have taken the
				full complement of routine TTHM and HAA5 compliance samples required of a
				system with your population and source water under section
				11-20-45.1
				(or you must have taken the full complement of reduced TTHM and HAA5 compliance
				samples required of a system with your population and source water under
				section
				11-20-45.1
				if you meet reduced monitoring criteria under section
				1-20-45.1)
				during the period specified in paragraph (d)(1) to meet the 40/30 certification
				criteria in subsection (d). You must have taken TTHM and HAA5 samples under
				subsections
				11-20-45.1(b)
				and (c) to be eligible for the very small system waiver in subsection
				(e).
(B) If you have not taken the
				required samples, you must conduct standard monitoring that meets the
				requirements in subsection (b), or a system specific study that meets the
				requirements in subsection (c).
(5) You must use only the analytical methods
				specified in subsection
				11-20-45.1(b),
				or otherwise approved by EPA for monitoring under this section, to demonstrate
				compliance with the requirements of this section.
(6) IDSE results will not be used for the
				purpose of determining compliance with MCLs in section
				11-20-4.1.