18 AAC 80.300 - Maximum contaminant levels (MCLs)
(a)
General
requirement.Subject to a variance issued under
18 AAC 80.370, a variance issued
under 18 AAC 80.371, or an exemption
granted under
18 AAC 80.375, the owner or
operator of a public water system may not cause or allow the use of water from
that system for human consumption if the water contains, or has a significant
potential for containing
(1) a contaminant in
a concentration that exceeds a primary maximum contaminant level (MCL) set
under (b) of this section; or
(2) a
contaminant other than one described in (1) of this subsection, if the
department determines that the concentration of that contaminant is high enough
to make the water a hazard to human health.
(b)
Primary MCLs: The primary
MCLs for a public water system are as follows:
(1) for inorganic chemical contaminants, the
MCLs set out in 40 C.F.R.
141.62(b), adopted by
reference in
18 AAC
80.010(a);
(2) for organic chemical contaminants that
are
(A) synthetic organic chemicals, the MCLs
set out in 40 C.F.R.
141.61(c), adopted by
reference in
18 AAC
80.010(a);
(B) volatile organic chemicals, the MCLs set
out in 40 C.F.R.
141.61(a), adopted by
reference in
18 AAC
80.010(a);
(C) disinfection byproducts, the MCLs set out
in 40 C.F.R.
141.64(a), adopted by
reference in
18 AAC
80.010(a);
(3) for turbidity, for a community water
system, non-transient non-community water system, or transient non-community
water system that uses a surface water source or a GWUDISW source and that
(A) meets the criteria for avoiding
filtration under 40 C.F.R.
141.71, adopted by reference in
18 AAC 80.010(a),
and under 18 AAC 80.620, the MCL as set out
in 40 C.F.R.
141.71(a)(2);
(B) does not meet the criteria for avoiding
filtration, the MCL as set out in
40 C.F.R.
141.73, adopted by reference in
18 AAC
80.010(a);
(4) for Escherichia coli
bacteria, the MCL as set out in
40 C.F.R.
141.63(c) and (d), adopted
by reference in
18 AAC
80.010(a);
(5) for radionuclides, the MCL as set out in
40 C.F.R.
141.66, adopted by reference in
18 AAC
80.010(a).
(c)
Secondary MCLs. The
secondary MCLs for a public water system are set out in
40 C.F.R.
143.3, adopted by reference in
18 AAC 80.010(a).
The department will require a public water system to meet the secondary MCLs if
the department determines that public health is threatened or that exceeding a
secondary MCL is not in the public interest.
(d) Repealed 4/24/2009.
Notes
Authority:AS 46.03.020
AS 46.03.050
AS 46.03.070
AS 46.03.710
AS 46.03.720
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