Hawaii Administrative Rules › Title 11 - DEPARTMENT OF HEALTH › Subtitle 1 - GENERAL DEPARTMENTAL PROVISIONS › Chapter 20 - RULES RELATING TO PUBLIC WATER SYSTEMS › Section 11-20-45.3 - Stage 2 Disinfection Byproducts Requirements

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 achieving
				compliance with maximum contaminant levels based on locational running annual
				averages (LRAA) for total trihalomethanes (TTHM) and haloacetic acids
				(five)(HAA5), and for achieving compliance with maximum residual disinfectant
				residuals for chlorine and chloramine for certain consecutive
				systems.
(2) Applicability. You are
				subject to these requirements if your system is a community water system or a
				nontransient noncommunity 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.
(3) Schedule. You must comply with
				the requirements in this section on the schedule in the following table based
				on your system type.
If you are this type of system
You must comply with Stage 2 Disinfection Byproduct
							 monitoring by:1
Systems that are not part of a combined distribution
							 system and systems that serve the largest population in the combined
							 distribution system
System serving >=100,000
April 1, 2012
System serving 50,000-99,999
October 1, 2012
System serving 10,000-49,999
October 1, 2013
System serving <10,000
October 1, 20132 or
October 1, 20143
If you are this type of system
You must comply with Stage 2 Disinfection Byproduct
							 monitoring by:1
Other systems that are part of a combined
							 distribution system
Consecutive or wholesale system
-at the same time as the system with the earliest
							 compliance date in the combined distribution system
1The State may grant up to an
				  additional 24 months for compliance with MCLs and operational evaluation levels
				  if you require capital improvements to comply with an MCL.
2If no Cryptosporidium monitoring
				  is required under section
				  11-20-46.2(b)(1)(D).
3If no Cryptosporidium monitoring
				  is required under section
				  11-20-46.2(b)(1)(D)
				  or (F).
(A) Your monitoring frequency
				is specified in subsection (b)(1)(B).
(i) If
				you are required to conduct quarterly monitoring, you must begin monitoring in
				the first full calendar quarter that includes the compliance date in the table
				in this paragraph.
(ii) If you are
				required to conduct monitoring at a frequency that is less than quarterly, you
				must begin monitoring in the calendar month recommended in the IDSE report
				prepared under section
				11-20-45.2(b)
				or (c) or the calendar month identified in the Stage 2 Disinfection Byproduct
				monitoring plan developed under subsection (c) no later than 12 months after
				the compliance date in this table.
(B) If you are required to conduct quarterly
				monitoring, you must make compliance calculations at the end of the fourth
				calendar quarter that follows the compliance date and at the end of each
				subsequent quarter (or earlier if the LRAA calculated based on fewer than four
				quarters of data would cause the MCL to be exceeded regardless of the
				monitoring results of subsequent quarters). If you are required to conduct
				monitoring at a frequency that is less than quarterly, you must make compliance
				calculations beginning with the first compliance sample taken after the
				compliance date.
(C) 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) Monitoring
				and compliance
(A) Systems required to
				monitor quarterly. To comply with this section MCLs in section
				11-20-4.1(b)(2),
				you must calculate LRAAs for TTHM and HAA5 using monitoring results collected
				under this subpart and determine that each LRAA does not exceed the MCL. If you
				fail to complete four consecutive quarters of monitoring, you must calculate
				compliance with the MCL based on the average of the available data from the
				most recent four quarters. If you take more than one sample per quarter at a
				monitoring location, you must average all samples taken in the quarter at that
				location to determine a quarterly average to be used in the LRAA
				calculation.
(B) Systems required
				to monitor yearly or less frequently. To determine compliance with this section
				MCLs in section
				11-20-4.1(b)(2),
				you must determine that each sample taken is less than the MCL. If any sample
				exceeds the MCL, you must comply with the requirements of subsection (f). If no
				sample exceeds the MCL, the sample result for each monitoring location is
				considered the LRAA for that monitoring location.
(5) Violation. You are in violation of the
				monitoring requirements for each quarter that a monitoring result would be used
				in calculating an LRAA if you fail to monitor.