40 CFR §141.713

1. (a)Following initial bin classification under § 141.710(c), filtered systems must provide the level of treatment for Cryptosporidium required under § 141.711 according to the schedule in paragraph (c) of this section.
2. (b)Following initial determination of the mean Cryptosporidium level under § 141.712(a)(1), unfiltered systems must provide the level of treatment for Cryptosporidium required under § 141.712 according to the schedule in paragraph (c) of this section.
3. (c)Cryptosporidium treatment compliance dates.
4. (d)If the bin classification for a filtered system changes following the second round of source water monitoring, as determined under § 141.710(d), the system must provide the level of treatment for Cryptosporidium required under § 141.711 on a schedule the State approves.
5. (e)If the mean Cryptosporidium level for an unfiltered system changes following the second round of monitoring, as determined under § 141.712(a)(2), and if the system must provide a different level of Cryptosporidium treatment under § 141.712 due to this change, the system must meet this treatment requirement on a schedule the State approves.