(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.
(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.
(c) Cryptosporidium treatment compliance dates.
Cryptosporidium Treatment Compliance Dates Table
| Systems that serve . . . | Must comply with Cryptosporidium treatment requirements no later than . . .a |
|---|---|
| (1) At least 100,000 people | (i) April 1, 2012. |
| (2) From 50,000 to 99,999 people | (i) October 1, 2012. |
| (3) From 10,000 to 49,999 people | (i) October 1, 2013. |
| (4) Fewer than 10,000 people | (i) October 1, 2014. |
(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.
(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.