Current through Register Vol. 48, No. 38, September 20, 2024
a) A
filtered system supplier must provide the level of additional treatment for
Cryptosporidium specified in subsections (a)(1) through (a)(4) based on its bin
classification, as determined under Section
611.1010,
and according to the applicable schedule set forth in Section
611.1013.
1) If the supplier's bin classification is
Bin 1, and the supplier uses conventional filtration treatment (including
softening) in full compliance with the applicable provisions of Subparts B, R,
and X, no additional treatment is required.
2) If the supplier's bin classification is
Bin 2, and the supplier uses conventional filtration treatment (including
softening) in full compliance with the applicable provisions of Subparts B, R,
and X, then the additional Cryptosporidium treatment requirements are a 1-log
treatment.
3) If the supplier's bin
classification is Bin 2, and the supplier uses direct filtration in full
compliance with the applicable provisions of Subparts B, R, and X, then the
additional Cryptosporidium treatment requirements are a
1.5 -log
treatment.
4) If the supplier's bin
classification is Bin 2, and the supplier uses slow sand or diatomaceous earth
filtration in full compliance with the applicable provisions of Subparts B, R,
and X, then the additional Cryptosporidium treatment requirements are a 1-log
treatment.
5) If the supplier's bin
classification is Bin 2, and the supplier uses alternative filtration
technologies in full compliance with the applicable provisions of Subparts B,
R, and X, then the additional Cryptosporidium treatment requirements are as
determined by the Agency, by a SEP issued under Section
611.110,
such that the total Cryptosporidium removal and inactivation is at least 4.0
-log.
6) If the supplier's bin
classification is Bin 3, and the supplier uses conventional filtration
treatment (including softening) in full compliance with the applicable
provisions of Subparts B, R, and X, then the additional Cryptosporidium
treatment requirements are a 2-log treatment.
7) If the supplier's bin classification is
Bin 3, and the supplier uses direct filtration in full compliance with the
applicable provisions of Subparts B, R, and X, then the additional
Cryptosporidium treatment requirements are a 2.5 -log treatment.
8) If the supplier's bin classification is
Bin 3, and the supplier uses slow sand or diatomaceous earth filtration in full
compliance with the applicable provisions of Subparts B, R, and X, then the
additional Cryptosporidium treatment requirements are a 2-log
treatment.
9) If the supplier's bin
classification is Bin 3, and the supplier uses alternative filtration
technologies in full compliance with the applicable provisions of Subparts B,
R, and X, then the additional Cryptosporidium treatment requirements are as
determined by the Agency, by a SEP, such that the total Cryptosporidium removal
and inactivation is at least 5.0 -log.
10) If the supplier's bin classification is
Bin 4, and the supplier uses conventional filtration treatment (including
softening) in full compliance with the applicable provisions of Subparts B, R,
and X, then the additional Cryptosporidium treatment requirements are a 2.5-log
treatment.
11) If the supplier's
bin classification is Bin 4, and the supplier uses direct filtration in full
compliance with the applicable provisions of Subparts B, R, and X, then the
additional Cryptosporidium treatment requirements are a 3-log
treatment.
12) If the supplier's
bin classification is Bin 4, and the supplier uses slow sand or diatomaceous
earth filtration in full compliance with the applicable provisions of Subparts
B, R, and X, then the additional Cryptosporidium treatment requirements are a
2.5-log treatment.
13) If the
supplier's bin classification is Bin 4, and the supplier uses alternative
filtration technologies in full compliance with the applicable provisions of
Subparts B, R, and X, then the additional Cryptosporidium treatment
requirements are as determined by the Agency, by a SEP, such that the total
Cryptosporidium removal and inactivation is at least 5.5 -log.
b) Required Treatment
1) A filtered system supplier must use one or
more of the treatment and management options listed in Section
611.1015,
termed the microbial toolbox, to comply with the additional Cryptosporidium
treatment required in subsection (a).
2) A supplier classified in Bin 3 or Bin 4
must achieve at least 1-log of the additional Cryptosporidium treatment
required under subsection (a) using either one or a combination of the
following: bag filters, bank filtration, cartridge filters, chlorine dioxide,
membranes, ozone, or UV, as described in Sections
611.1016
through
611.1020.
c) A failure by a supplier in any month to
achieve treatment credit by meeting criteria in Sections
611.1016
through
611.1020
for microbial toolbox options that is at least equal to the level of treatment
required in subsection (a) is a violation of the treatment technique
requirement.
d) If the Agency
determines, by a SEP, during a sanitary survey or an equivalent source water
assessment that after a supplier completed the monitoring conducted under
Section
611.1001(a)
or
611.1001(b),
significant changes occurred in the supplier's watershed that could lead to
increased contamination of the source water by Cryptosporidium, the supplier
must take actions specified by the Agency in the SEP to address the
contamination. These actions may include additional source water monitoring or
implementing microbial toolbox options listed in Section 611.1015.
BOARD NOTE: Derived from
40 CFR
141.711.
