Hawaii Administrative Rules › Title 11 - DEPARTMENT OF HEALTH › Subtitle 1 - GENERAL DEPARTMENTAL PROVISIONS › Chapter 20 - RULES RELATING TO PUBLIC WATER SYSTEMS › Section 11-20-9 - Microbiological contaminant sampling and analytical requirements

Current through June, 2024
(a) (Reserved)
(b) Repeat monitoring.
(1) If a routine sample is total
				coliform-positive, the supplier of water shall collect a set of repeat samples
				within twenty-four hours of being notified of the positive result. The supplier
				who collects more than one routine sample per month shall collect no fewer than
				three repeat samples for each total coliform-positive sample found. A supplier
				who normally collects one routine sample per month shall collect no fewer than
				four repeat samples for each total coliform-positive sample found. The director
				may extend the twenty-four hour limit on a case-by-case basis if the supplier
				has a logistical problem in collecting or analyzing the repeat samples within
				twenty-four hours that is beyond the supplier's control. In the case of an
				extension, the director shall specify how much time the supplier has to collect
				the repeat samples.
(2) The
				supplier shall collect at least one repeat sample from the sampling tap where
				the original total coliform-positive sample was taken, and at least one repeat
				sample at a tap within five service connections upstream and at least one
				repeat sample at a tap within five service connections downstream of the
				original sampling site. If a total coliform-positive sample is at the end of
				the distribution system, or one away from the end of the distribution system,
				the director may waive the requirement to collect at least one repeat sample
				upstream or downstream of the original sampling site. However, the supplier
				shall collect the required number of repeat samples. A system with a single
				service connection may take all repeats from the same sample tap.
(3) The supplier shall collect all repeat
				samples on the same day.
(4) If one
				or more repeat samples in the set is total coliform-positive, the supplier
				shall collect an additional set of repeat samples in the manner specified in
				paragraphs (1) to (3) unless the supplier determines the MCL for total
				coliforms in section
				11-20-6
				has been exceeded and notifies the director. The additional samples shall be
				collected within twenty-four hours of being notified of the positive result,
				unless the director extends the limit as provided in paragraph (1). The
				supplier shall repeat this process until either total coliforms are not
				detected in one complete set of repeat samples or the supplier determines that
				the MCL for total coliforms in section
				11-20-6
				has been exceeded and notifies the director.
(5)
				 If a supplier collecting fewer than five routine samples per
				month has one or more total coliform-positive samples and the director does not
				invalidate the sample(s) under subsection (c), the supplier shall collect at
				least five routine samples during the next month the system provides water to
				the public.
(6) Results of all
				routine and repeat samples not invalidated by the director shall be included in
				determining compliance with the MCL for total coliforms in section
				11-20-6.