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Indiana Administrative Code (Last Updated: December 20, 2016) |
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Title 327. WATER POLLUTION CONTROL DIVISION |
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Article 327IAC8. PUBLIC WATER SUPPLY |
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Rule 327IAC8-2.6. Enhanced Filtration and Disinfection |
Section 327IAC8-2.6-12. Filtered system additional Cryptosporidium treatment requirements; treatment technique requirements; enhanced treatment for Cryptosporidium
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(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)
1As determined by the commissioner such that the total Cryptosporidium removal and inactivation is at least 4.0-log.
2As determined by the commissioner such that the total Cryptosporidium removal and inactivation is at least 5.0-log.
3As 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.
(Water Pollution Control Division; 327 IAC 8-2.6-12; filed May 7, 2010, 9:30 a.m.: 20100602-IR-327080198FRA)