Section NR 810.35 - Cryptosporidium treatment requirements for filtered systems(1) Filtered systems shall provide the level of additional treatment for Cryptosporidium specified in this paragraph based on their bin classification as determined under s. NR 810.34 and according to the schedule in s. NR 810.37.(2) Systems shall use the following treatment or management practices: (a) Filtered systems shall use one or more of the treatment and management options listed in s. NR 810.41, termed the microbial toolbox, to comply with the additional Cryptosporidium treatment required in sub. (1). (b) Filtered systems classified in Bin 3 and Bin 4 shall achieve at least 1-log of the additional Cryptosporidium treatment required under sub. (1) using either one or a combination of the following: bag filters, bank filtration, cartridge filters, chlorine dioxide, membranes, ozone, or UV, as described in ss. NR 810.42 to 810.46. (3) Failure by a filtered system in any month to achieve treatment credit by meeting criteria in ss. NR 810.41 to for microbial 810.46 to olbox options that is at least equal to the level of treatment required in sub. (1) is a violation of the treatment technique requirement.(4) If the department determines during a sanitary survey or an equivalent source water assessment that after a filtered system completed the monitoring conducted under s. NR 809.331(1) or 809.331(2), significant changes occurred in the system's watershed that could lead to increased contamination of the source water by Cryptosporidium, the system shall take actions specified by the department to address the contamination. These actions may include additional source water monitoring or implementing microbial toolbox options listed in s. NR 810.41, or both. | | | | | | |
| If the system bin classification is: | And the system uses the following filtration treatment in full compliance with s. NR 810.29 (as appli-cable), then the additional Cryptosporidium treatment requirements are: | |
| Conventional filtration treatment (including softening) | Direct filtration | Slow sand or diatomaceous earth filtration | Alternative filtration technologies including membrane filtration | |
| 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 | As determined by the department such that the total Cryptosporid-ium removal and inactivation is at least 4.0-log. | |
| Bin 3 | 2-log treatment | 2.5-log treatment | 2-log treatment | As determined by the department such that the total Cryptosporid-ium removal and inactivation is at least 5.0-log. | |
| Bin 4 | 2.5-log treatment | 3-log treatment | 2.5-log treatment | As determined by the department such that the total Cryptosporid-ium removal and inactivation is at least 5.5-log. | |
| | | | | | |
Wis. Admin. Code Department of Natural Resources § NR 810.35
CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.