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).
Source water type | Population size category | Monitoring frequency1 | Distribution system monitoring location total per monitoring period |
Subpart H | <500 | per year | 2 |
500-3,300 | per quarter | 2 | |
3,301-9,999 | per quarter | 2 | |
10,000-49,999 | per quarter | 4 | |
50,000-249,999 | per quarter | 8 | |
250,000-999,999 | per quarter | 12 | |
1,000,000-4,999,999 | per quarter | 16 | |
>5,000,000 | per quarter | 20 | |
Ground | <500 | per year | 2 |
water | 500-9,999 | per year | 2 |
10,000-99,999 | per quarter | 4 | |
100,000-499,999 | per quarter | 6 | |
>500,000 | per quarter | 8 |
1All systems must monitor during month of highest DBP concentrations.
2Systems on quarterly monitoring must take dual sample sets every 90 days at each monitoring location, except for subpart H systems serving 500-3,300. Ground water systems serving 500-9,999 on annual monitoring must take dual sample sets at each monitoring location. All other systems on annual monitoring and subpart H systems serving 500-3,300 are required to take individual TTHM and HAA5 samples (instead of a dual sample set) at the locations with the highest TTHM and HAA5 concentrations, respectively. For systems serving fewer than 500 people, only one location with a dual sample set per monitoring period is needed if highest TTHM and HAA5 concentrations occur at the same location, and month, if monitored annually).
Haw. Code R. § 11-20-45.3