Haw. Code R. § 11-20-5 - Maximum contaminant levels for turbidity
(a) The
MCLs for turbidity apply to all public water systems using surface water
sources in whole or in part.
(b)
The requirements in this subsection apply to filtered surface water systems
until June 29, 1993. The requirements in this subsection apply to unfiltered
systems until June 29, 1993, or until filtration is installed, whichever is
later. The director shall determine, in writing pursuant to
42 U.S.C. §
300g-1(b)(7)(C)(iii), which
systems must install filtration. The MCLs measured at a representative entry
point(s) to the distribution system, are:
(1)
One turbidity unit, as determined by a monthly average pursuant to section
11-20-10 except that five or fewer turbidity units may be allowed if the supplier of
water can demonstrate to the director that the higher turbidity does not do any
of the following:
(A) Interfere with
disinfection;
(B) Prevent
maintenance of an effective disinfectant agent throughout the distribution
system; or
(C) Interfere with
microbiological determinations.
(2) Five turbidity units based on an average
for two consecutive days pursuant to section
11-20-10.
(c) The MCL for filtered water
turbidity levels, after June 29, 1993, shall be less than or equal to the
applicable value in this subsection in ninety-five per cent of the measurements
taken every month, and shall not exceed 5 nephelometric turbidity units or NTU
at any time for the following filter units:
(1) Conventional treatment, direct
filtration, and other filtration technologies, 0.5 nephelometric turbidity
units or NTU; and
(2) Slow sand,
and diatomaceous earth, 1.0 nephelometric turbidity units or NTU.
Notes
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