(a) In addition to complying with the
requirements of 40 C.F.R.
141.73(filtration), adopted
by reference in
18 AAC 80.010(a),
the owner of a community water system, non-transient non-community water
system, or transient non-community water system that uses conventional
filtration, direct filtration, or slow sand filtration may submit a written
request to the department to allow a higher turbidity level. On a case-by-case
basis and if the written request includes sufficient information to allow a
determination in accordance with standard sanitary engineering practices and
principles, the department will determine whether to allow turbidity levels of
up to
(1) one NTU for a system using
conventional filtration or direct filtration under
40 C.F.R.
141.73(a), adopted by
reference in
18 AAC
80.010(a);
(b) A community water system, non-transient
non-community water system, or transient non-community water system that meets
the requirements in 40
C.F.R.
141.73(d), adopted by
reference under
18 AAC 80.010(a),
to use an alternative filtration system, and that serves fewer than 10,000
individuals, must comply with the requirements of
40 C.F.R.
141.550 - 41.553 (combined filter effluent
requirements), adopted by reference in
18 AAC
80.010(a).
Notes
18 AAC
80.650
Eff. 10/1/99, Register
151; am 9/28/2001, Register 159; am 1/11/2006, Register 177; am 8/19/2006,
Register 179; am 11/9/2006, Register 180; am 4/24/2009, Register
190
Guidance on standard sanitary engineering practices and
principles, as addressed in 18 AAC 80.650(a), may be found in the department's
Alaska Water Treatment Guidance Manual, and in EPA's Guidance Manual for
Compliance with the Filtration and Disinfection Requirements for Public Water
Systems Using Surface Water Sources. Information about how to review or obtain
these documents is in the editor's note to
18 AAC
80.010.
Authority:AS
46.03.020
AS 46.03.050
AS 46.03.070
AS 46.03.710
AS
46.03.720
