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

Current through June, 2024
(a) 
				Community water systems shall conduct monitoring to determine compliance with
				the MCLs specified in section
				11-20-3
				in accordance with this section. Non-transient, non-community water systems
				shall conduct monitoring to determine compliance with the MCLs specified in
				section
				11-20-3
				in accordance with this section. Transient, non-community water systems shall
				conduct monitoring to determine compliance with the nitrate and nitrite MCLs in
				section
				11-20-3
				in accordance with this section. Monitoring shall be conducted as follows:
(1) Ground water systems shall take a minimum
				of one sample at every entry point to the distribution system which is
				representative of each well after treatment (hereafter called a sampling point)
				beginning in the initial compliance period. The system shall take each sample
				at the same sampling point unless conditions make another sampling point more
				representative of each source or treatment plant.
(2) Surface water systems shall take a
				minimum of one sample at every entry point to the distribution system after any
				application of treatment or in the distribution system at a point which is
				representative of each source after treatment (hereafter called a sampling
				point) beginning in the initial compliance period. The system shall take each
				sample at the same sampling point unless conditions make another sampling point
				more representative of each source or treatment plant. Note: For purposes of
				this paragraph, surface water systems include systems with a combination of
				surface and ground sources.
(3) If
				a system draws water from more than one source and the sources are combined
				before distribution, the system must sample at an entry point to the
				distribution system during periods of normal operating conditions (i.e., when
				water is representative of all sources being used).
(4) The director may reduce the total number
				of samples which must be analyzed by allowing the use of compositing. Composite
				samples from a maximum of five samples are allowed, provided that the detection
				limit of the method used for analysis is less than one-fifth of the MCL.
				Compositing of samples must be done in the laboratory.
(A)
				 If the concentration in the composite sample is greater than or
				equal to one-fifth of the MCL of any inorganic chemical, then a follow-up
				sample must be taken within fourteen days at each sampling point included in
				the composite. These samples must be analyzed for the contaminants which
				exceeded one-fifth of the MCL in the composite sample. Detection limits for
				each analytical method and MCLs for each inorganic contaminant are specified in
				40 C.F.R.
				§
												141.23(a)(4)(i).
(B)  If the population served by
				the system is greater than 3,300 persons, then compositing may only be
				permitted by the director at sampling points within a single system. In systems
				serving less than or equal to 3,300 persons, the director may permit
				compositing among different systems provided the five-sample limit is
				maintained.
(C)  If duplicates of
				the original sample taken from each sampling point used in the composite are
				available, the system may use these instead of resampling. The duplicates must
				be analyzed and the results reported to the State within fourteen days of
				collection.
(5) The
				frequency of monitoring for asbestos shall be in accordance with subsection
				(b); the frequency of monitoring for antimony, arsenic, barium, beryllium,
				cadmium, chromium, cyanide, fluoride, mercury, nickel, selenium, and thallium
				shall be in accordance with subsection (c); the frequency of monitoring for
				nitrate shall be in accordance with subsection (d); and the frequency of
				monitoring for nitrite shall be in accordance with subsection (e).