Haw. Code R. § tit. 11, subtit. 1, ch. 20, app C
If you are a... | You may reduce monitoring if you have monitored at least one year and your... | To this level |
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. |
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. |
If you are a... | You may reduce monitoring if you have monitored at least one year and your... | To this level |
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. |
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. |
Haw. Code R. tit. 11, subtit. 1, ch. 20, app C