Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 611 - PRIMARY DRINKING WATER STANDARDS › Subpart AG - INTERIM LEAD AND COPPER RULES › Appendix B - Percent Inactivation of G. Lamblia Cysts

Current through Register Vol. 48, No. 28, July 12, 2024
Table 1.1
CT-99.9 for 99.9 Percent Inactivation of
				  Giardia Lamblia
Cysts by Free Chlorine at 0.5 ° or
				  Lower
These CT values achieve greater than a 99.99 percent
				  inactivation of viruses. CT values between the indicated pH values may be
				  determined by linear interpolation. CT values between the indicated
				  temperatures of different tables may be determined by linear interpolation. If
				  no interpolation is used, use the CT 99.9 value at the lower temperature and at
				  the higher pH.
Free Residual (mg/l)
pH
[LESS THAN OR EQUAL TO] 6.0
6.5
7.0
7.5
8.0
8.5
[GREATER THAN OR EQUAL TO] 9.0
[LESS THAN OR EQUAL TO] 0.4
137
163
195
237
277
329
390
0.6
141
168
200
239
286
342
407
0.8
145
172
205
246
295
354
422
1.0
148
176
210
253
304
365
437
1.2
152
180
215
259
313
376
451
1.4
155
184
221
266
321
387
464
1.6
157
189
226
273
329
397
477
1.8
162
193
231
279
338
407
489
2.0
165
197
236
286
346
417
500
2.2
169
201
242
297
353
426
511
2.4
172
205
247
298
361
435
522
2.6
175
209
252
304
368
444
533
2.8
178
213
257
310
375
452
543
3.0
181
217
261
316
382
460
552
Table 1.2
CT-99.9 for 99.9 Percent Inactivation of
				  Giardia Lamblia Cysts by Free Chlorine at 5.0 ° C
These CT values achieve greater than a 99.99 percent
				  inactivation of viruses. CT values between the indicated pH values may be
				  determined by linear interpolation. CT values between the indicated
				  temperatures of different tables may be determined by linear interpolation. If
				  no interpolation is used, use the CT 99.9 value at the lower temperature and at
				  the higher pH.
Free Residual (mg/l)
pH
[LESS THAN OR EQUAL TO] 6.0
6.5
7.0
7.5
8.0
8.5
[GREATER THAN OR EQUAL TO] 9.0
[LESS THAN OR EQUAL TO] 0.4
97
117
139
166
198
236
279
0.6
100
120
143
171
204
244
291
0.8
103
122
146
175
210
252
301
1.0
105
125
149
179
216
260
312
1.2
107
127
152
183
221
267
320
1.4
109
130
155
187
227
274
329
1.6
111
132
158
192
232
281
337
1.8
114
135
162
196
238
287
345
2.0
116
138
165
200
243
294
353
2.2
118
140
169
204
248
300
361
2.4
120
143
172
209
253
306
368
2.6
122
146
175
213
258
312
375
2.8
124
148
178
217
263
318
382
3.0
126
151
182
221
268
324
369
Table 1.3
CT-99.9 for 99.9 Percent Inactivation of
				  Giardia Lamblia Cysts by Free Chlorine at 10.0 ° C
These CT values achieve greater than a 99.99 percent
				  inactivation of viruses. CT values between the indicated pH values may be
				  determined by linear interpolation. CT values between the indicated
				  temperatures of different tables may be determined by linear interpolation. If
				  no interpolation is used, use the CT 99.9 value at the lower temperature and at
				  the higher pH.
Free Residual (mg/l)
pH
[LESS THAN OR EQUAL TO] 6.0
6.5
7.0
7.5
8.0
8.5
[GREATER THAN OR EQUAL TO] 9.0
[LESS THAN OR EQUAL TO] 0.4
73
88
104
125
149
177
209
0.6
75
90
107
128
153
183
218
0.8
78
92
110
131
158
189
226
1.0
79
94
112
134
162
195
234
1.2
80
95
114
137
166
200
240
1.4
82
98
116
140
170
206
247
1.6
83
99
119
144
174
211
253
1.8
86
101
122
147
179
215
259
2.0
87
104
124
150
182
221
265
2.2
89
105
127
153
186
225
271
2.4
90
107
129
157
190
230
276
2.6
92
110
131
160
194
234
281
2.8
93
111
134
163
197
239
287
3.0
95
113
137
166
201
243
292
Table 1.4
CT-99.9 for 99.9 Percent Inactivation of
				  Giardia Lamblia Cysts by Free Chlorine at 15.0 ° C
These CT values achieve greater than a 99.99 percent
				  inactivation of viruses. CT values between the indicated pH values may be
				  determined by linear interpolation. CT values between the indicated
				  temperatures of different tables may be determined by linear interpolation. If
				  no interpolation is used, use the CT 99.9 value at the lower temperature and at
				  the higher pH.
Free Residual (mg/l)
pH
[LESS THAN OR EQUAL TO] 6.0
6.5
7.0
7.5
8.0
8.5
[GREATER THAN OR EQUAL TO] 9.0
[LESS THAN OR EQUAL TO] 0.4
49
59
70
83
99
118
140
0.6
50
60
72
86
102
122
146
0.8
52
61
73
88
105
126
151
1.0
53
63
75
90
108
130
156
1.2
54
64
76
92
111
134
160
1.4
55
65
78
94
114
137
165
1.6
56
66
79
96
116
141
169
1.8
57
68
81
98
119
144
173
2.0
58
69
83
100
122
147
177
2.2
59
70
85
102
124
150
181
2.4
60
72
86
105
127
153
184
2.6
61
73
88
107
129
156
188
2.8
62
74
89
109
132
159
191
3.0
63
76
91
111
134
162
195
Table 1.5
CT-99.9 for 99.9 Percent Inactivation of
				  Giardia Lamblia Cysts by Free Chlorine at 20° C
These CT values achieve greater than a 99.99 percent
				  inactivation of viruses. CT values between the indicated pH values may be
				  determined by linear interpolation. CT values between the indicated
				  temperatures of different tables may be determined by linear interpolation. If
				  no interpolation is used, use the CT 99.9 value at the lower temperature and at
				  the higher pH.
Free Residual (mg/l)
pH
[LESS THAN OR EQUAL TO] 6.0
6.5
7.0
7.5
8.0
8.5
[GREATER THAN OR EQUAL TO] 9.0
[LESS THAN OR EQUAL TO] 0.4
36
44
52
62
74
89
105
0.6
38
45
54
64
77
92
109
0.8
39
46
55
66
79
95
113
1.0
39
47
56
67
81
98
117
1.2
40
48
57
69
83
100
120
1.4
41
49
58
70
85
103
123
1.6
42
50
59
72
87
105
126
1.8
43
51
61
74
89
108
129
2.0
44
52
62
75
91
110
132
2.2
44
53
63
77
93
113
135
2.4
45
54
65
78
95
115
138
2.6
46
55
66
80
97
117
141
2.8
47
56
67
81
99
119
143
3.0
47
57
68
83
101
122
146
Table 1.6
CT-99.9 for 99.9 Percent Inactivation of
				  Giardia Lamblia Cysts
by Free Chlorine at 25° C and
				  Higher
These CT values achieve greater than a 99.99 percent
				  inactivation of viruses. CT values between the indicated pH values may be
				  determined by linear interpolation. CT values between the indicated
				  temperatures of different tables may be determined by linear interpolation. If
				  no interpolation is used, use the CT 99.9 value at the lower temperature and at
				  the higher pH.
Free Residual (mg/l)
pH
[LESS THAN OR EQUAL TO] 6.0
6.5
7.0
7.5
8.0
8.5
[GREATER THAN OR EQUAL TO] 9.0
[LESS THAN OR EQUAL TO] 0.4
24
29
35
42
50
59
70
0.6
25
30
36
43
51
61
73
0.8
26
31
37
44
53
63
75
1.0
26
31
37
45
54
65
78
1.2
27
32
38
46
55
67
80
1.4
27
33
39
47
57
69
82
1.6
28
33
40
48
58
70
84
1.8
29
34
41
49
60
72
86
2.0
29
35
41
50
61
74
88
2.2
30
35
42
51
62
75
90
2.4
30
36
43
52
63
77
92
2.6
31
37
44
53
65
78
94
2.8
31
37
45
54
66
80
96
3.0
32
38
46
55
67
81
97
Table 2.1
CT-99.9 for 99.9 Percent Inactivation of
				  Giardia Lamblia Cysts by Chlorine Dioxide and Ozone
These CT values achieve greater than a 99.99 percent
				  inactivation of viruses. CT values between the indicated pH values may be
				  determined by linear interpolation. If no interpolation is used, use the
				  CT99.9 value at the lower temperature for determining
				  CT99.9 values between indicated temperatures.
[LESS THAN OR EQUAL TO] 1° C
5° C
10° C
15° C
20° C
[GREATER THAN OR EQUAL TO] 25° C
Chlorine dioxide
63
26
23
19
15
11
Ozone
2.9
1.9
1.4
0.95
0.72
0.48
Table 3.1
CT-99.9 for 99.9 Percent Inactivation of
				  Giardia Lamblia Cysts by Chloramines
These values are for pH values of 6 to 9. These CT values may
				  be assumed to achieve greater than a 99.99 percent inactivation of viruses only
				  if chlorine is added and mixed in the water prior to the addition of ammonia.
				  If this condition is not met, the system must demonstrate, based on on-site
				  studies or other information, as approved by the Agency, that the system is
				  achieving at least a 99.99 percent inactivation of viruses. CT values between
				  the indicated temperatures may be determined by linear interpolation. If no
				  interpolation is used, use the CT99.9 value at the lower
				  temperature for determining CT99.9 values between
				  indicated temperatures.
[LESS THAN OR EQUAL TO] 1° C
5° C
10° C
15° C
20° C
[GREATER THAN OR EQUAL TO] 25° C
Chloramines
3800
2200
1850
1500
1100
750
BOARD NOTE: Derived from
					 40 CFR
					 141.74(b) Tables 1.1 through
					 3.1(2012).