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40 CFR § 141.713 - Schedule for compliance with treatment requirements. 

---
identifier: "/us/cfr/t40/s141.713"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 141.713 - Schedule for compliance with  treatment requirements."
title_number: 40
title_name: "Protection of Environment"
section_number: "141.713"
section_name: "Schedule for compliance with  treatment requirements."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "D"
subchapter_name: "WATER PROGRAMS"
part_number: "141"
part_name: "NATIONAL PRIMARY DRINKING WATER REGULATIONS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 300f, 300g-1, 300g-2, 300g-3, 300g-4, 300g-5, 300g-6, 300j-4, 300j-9, and 300j-11."
regulatory_source: "40 FR 59570, Dec. 24, 1975, unless otherwise noted."
cfr_part: "141"
---

# 141.713 Schedule for compliance with  treatment requirements.

(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 . . . |
| --- | --- |
| (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. |
| States may allow up to an additional two years for complying with the treatment requirement for systems making capital improvements. |  |

(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.