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Illinois Administrative Code (Last Updated: March 27, 2024) |
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TITLE35. ENVIRONMENTAL PROTECTION |
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PART611. PRIMARY DRINKING WATER STANDARDS |
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SUBPARTAG. INTERIM LEAD AND COPPER RULES |
§611.TABLE I. CT Values (mg·min/l) for Cryptosporidium Inactivation by Ozone
Latest version.
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Log Credit
Water Temperature (°C)
≤ 0.5
1
2
3
5
7
10
15
20
25
30
0.25
6.0
5.8
5.2
4.8
4.0
3.3
2.5
1.6
1.0
0.6
0.39
0.5
12
12
10
9.5
7.9
6.5
4.9
3.1
2.0
1.2
0.78
1.0
24
23
21
19
16
13
9.9
6.2
3.9
2.5
1.6
1.5
36
35
31
29
24
20
15
9.3
5.9
3.7
2.4
2.0
48
46
42
38
32
26
20
12
7.8
4.9
3.1
2.5
60
58
52
48
40
33
25
16
9.8
6.2
3.9
3.0
72
69
63
57
47
39
30
19
12
7.4
4.7
A supplier may use the following equation to determine log credit between the indicated values:
Log credit = (0.0397 ´ (1.09757)Temp(in °C)) ´ CT
BOARD NOTE: Derived from the table at 40 CFR 141.720(b)(2) (2012).
(Source: Amended at 37 Ill. Reg. 1978, effective February 4, 2013)