Figure: 30 TAC §290.111(c)(3)(B)

Treatment Technique Requirements for Cryptosporidium (1)
Average Cryptosporidium Level in the
Raw Water		 Bin Classification Minimum
Removal/Inactivation
Requirement
Cryptosporidium < 0.075 oocysts/L Bin 1 2.0-log
0.075 oocysts/L ≤ Cryptosporidium < 1.0
oocysts/L		 Bin 2 4.0-log
1.0 oocysts/L ≤ Cryptosporidium < 3.0
oocysts/L		 Bin 3 5.0-log
Cryptosporidium ≥ 3.0 oocysts/L Bin 4 5.5-log

(1)The executive director will assign Cryptosporidium removal credit based on the treatment
processes used at the plant:

a) Treatment plants utilizing coagulation, flocculation, and granular media filtration will
receive a 2.5-log Cryptosporidium removal credit.

b) Treatment plants utilizing coagulation, flocculation, clarification, and granular media
filtration will receive a 3.0-log Cryptosporidium removal credit.

c) The executive director will assign Cryptosporidium removal credit to treatment plants
utilizing bag, cartridge, or membrane filters on an individual basis.