327 IAC 8-2.6-12 - Filtered system additional Cryptosporidium treatment requirements; treatment technique requirements; enhanced treatment for Cryptosporidium
Authority: IC 13-13-5; IC 13-14-8-7; IC 13-14-9; IC 13-18-3-2; IC 13-18-16
Affected: IC 13-18-3-11
Sec. 12.
(a) A
filtered PWS shall provide the level of additional treatment for
Cryptosporidium specified in the following table based on the system's bin
classification calculated under section 11 of this rule and according to the
schedule in section 13 of this rule:
Table 12
If the system bin classification is: | And the system uses the following filtration treatment in full compliance with 327 IAC 8-2-8.5, 327 IAC 8-2-8.6, 327 IAC 8-2-8.7, 327 IAC 8-2-8.8, 327 IAC 8-2-14, and sections 2 through 5 of this rule (as applicable), then the additional Cryptosporidium treatment requirements are: | |||
Conventional filtration treatment (including softening) | Direct filtration | Slow sand or diatomaceous earth filtration | Alternative filtration technologies | |
Bin 1 | No additional treatment | No additional treatment | No additional treatment | No additional treatment |
Bin 2 | 1-log treatment | 1.5-log treatment | 1-log treatment | (1) |
Bin 3 | 2-log treatment | 2.5-log treatment | 2-log treatment | (2) |
Bin 4 | 2.5-log treatment | 3-log treatment | 2.5-log treatment | (3) |
1 As determined
by the commissioner such that the total Cryptosporidium removal and
inactivation is at least 4.0-log.
2
As determined by the commissioner such that the total Cryptosporidium removal
and inactivation is at least 5.0-log.
3 As determined by the commissioner such that
the total Cryptosporidium removal and inactivation is at least
5.5-log.
(b) Treatment
requirements are as follows:
(1) A filtered
PWS shall use one (1) or more of the treatment and management options listed
under section 15 of this rule, termed the microbial toolbox, to comply with the
additional Cryptosporidium treatment required under subsection (a).
(2) A PWS classified as Bin 3 or Bin 4 shall
achieve at least 1-log of additional Cryptosporidium treatment required under
subsection (a) using either one (1) or a combination of:
(A) bag filters;
(B) bank filtration;
(C) cartridge filters;
(D) chlorine dioxide;
(E) membranes;
(F) ozone; or
(G) ultraviolet filtration;
as described under sections 16 through 20 of this rule.
(c) Failure by a PWS in any month to achieve
treatment credit by meeting criteria in sections 16 through 20 of this rule for
microbial toolbox options that is at least equal to the level of treatment
required under subsection (a):
(1) is a
violation of the treatment technique requirement; and
(2) requires public notification under 327
IAC 8-2.1.
(d) If the
commissioner determines during a sanitary survey or equivalent source water
assessment that, after a system completed the monitoring in
40 CFR
141.701(a) or
40 CFR
141.701(b), as incorporated
by reference in section 8(a)(1) of this rule, significant changes occurred in
the watershed of the PWS that could lead to increased contamination of the
source water by Cryptosporidium, the PWS shall take actions specified by the
commissioner to address the contamination. These actions can include one (1) or
both of the following:
(1) Additional source
water monitoring.
(2) Implementing
microbial toolbox options listed under section 15 of this rule.
Notes
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