Hawaii Administrative Rules
Title 11 - DEPARTMENT OF HEALTH
Subtitle 1 - GENERAL DEPARTMENTAL PROVISIONS
Chapter 20 - RULES RELATING TO PUBLIC WATER SYSTEMS
Appendix C - REDUCED MONITORING FREQUENCY FOR TTHM AND HAA5 (HAR Section 11-20-45.1(c)(2)(A))
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If you are a... |
You may reduce monitoring if you have monitored at least one year and your... |
To this level |
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Subpart H system serving at least 10,000 persons which has a source water annual average TOC level, before any treatment, of <4.0 mg/L. |
TTHM annual average <0.040 mg/L and HAA5 annual average <0.030 mg/L. |
One sample per treatment plant per quarter at distribution system location reflecting maximum residence time. |
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Subpart H system serving from 500 to 9,999 persons which has a source water annual average TOC level, before any treatment, of <4.0 mg/L. |
TTHM annual average <0.040 mg/L and HAA5 annual average <0.030 mg/L. |
One sample per treatment plant per year at distribution system location reflecting maximum residence time during month of warmest water temperature. NOTE: Any Subpart H system serving fewer than 500 persons may not reduce its monitoring to less than one sample per treatment plant per year. |
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If you are a... |
You may reduce monitoring if you have monitored at least one year and your... |
To this level |
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System using only groundwater not under direct influence of surface water using chemical disinfectant and serving at least 10,000 persons. |
TTHM annual average <0.040 mg/L and HAA5 annual average <0.030 mg/L. |
One sample per treatment plant per year at distribution system location reflecting maximum residence time during month of warmest water temperature. |
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System using only ground water not under direct influence of surface water using chemical disinfectant and serving fewer than 10,000 persons. |
TTHM annual average <0.040 mg/L and HAA5 annual average <0.030 mg/L for two consecutive years OR TTHM annual average <0.020 mg/L and HAA5 annual average <0.015 mg/L for one year. |
One sample per treatment plant per three year monitoring cycle at distribution system location reflecting maximum residence time during month of warmest water temperature, with the three-year cycle beginning on January 1 following quarter in which system qualifies for reduced monitoring. |
