Section 179-25-013 - FILTERED SYSTEM ADDITIONAL CRYPTOSPORIDIUM TREATMENT REQUIREMENTS013.01 Filtered systems must provide the level of additional treatment for Cryptosporidium specified in 179 NAC 25-013 based on their bin classification as determined under 179 NAC 25-012 or 40 CFR 141 Subpart W and according to the schedule in 179 NAC 25-015 or 40 CFR 141 Subpart W. | If the system bin classification is . . . | And the system uses the following filtration treatment in full compliance with 179 NAC 13, 17 and 19 (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 Department such that the total Cryptosporidium removal and inactivation is at least 4.0-log.
2 As determined by the Department such that the total Cryptosporidium removal and inactivation is at least 5.0-log.
3 As determined by the Department such that the total Cryptosporidium removal and inactivation is at least 5.5-log.
013.02 Required Cryptosporidium Treatment25-013.02A Filtered systems must use one or more of the treatment and management options listed in 179 NAC 25-017, termed the microbial toolbox, to comply with the additional Cryptosporidium treatment required in 179 NAC 25-013.01.25-013.02B Systems classified in Bin 3 and Bin 4 must achieve at least 1-log of the additional Cryptosporidium treatment required under 179 NAC 25-013.01 using either one or a combination of the following: bag filters, bank filtration, cartridge filters, chlorine dioxide, membranes, ozone, or UV, as described in 179 NAC 25-018 through 179 NAC 25-022.013.03 Failure by a system in any month to achieve treatment credit by meeting criteria in 179 NAC 25-018 through 25-022 for microbial toolbox options that is at least equal to the level of treatment required in 179 NAC 25-013.01 is a violation of the treatment technique requirement.013.04 If the Department determines during a sanitary survey or an equivalent source water assessment that after a system completed source water monitoring, significant changes occurred in the system's watershed that could lead to increased contamination of the source water by Cryptosporidium, the system must take actions specified by the Department to address the contamination. These actions may include additional source water monitoring and/or implementing microbial toolbox options listed in 179 NAC 25-017.179 Neb. Admin. Code, ch. 25, § 013