If the system bin classification is . . . | And the system uses the following filtration treatment in full compliance with subparts H, P, and T of this part (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 State such that the total Cryptosporidium removal and inactivation is at least 4.0-log.
2 As determined by the State such that the total Cryptosporidium removal and inactivation is at least 5.0-log.
3 As determined by the State such that the total Cryptosporidium removal and inactivation is at least 5.5-log.
40 C.F.R. §141.711