---
kind: "section"
citation: "40 C.F.R. § 141.628"
title: "40"
number: "141.628"
heading: "Requirements for remaining on increased TTHM and HAA5 monitoring based on subpart L results."
url: "https://uscodex.org/cfr/40/141.628"
---

# §141.628. Requirements for remaining on increased TTHM and HAA5 monitoring based on subpart L results.


If you were on increased monitoring under [§ 141.132(b)(1)](/cfr/40/141.132.md?p=b-1), you must remain on increased monitoring until you qualify for a return to routine monitoring under [§ 141.625(c)](/cfr/40/141.625.md?p=c). You must conduct increased monitoring under [§ 141.625](/cfr/40/141.625.md) at the monitoring locations in the monitoring plan developed under [§ 141.622](/cfr/40/141.622.md) beginning at the date identified in [§ 141.620(c)](/cfr/40/141.620.md?p=c) for compliance with this subpart and remain on increased monitoring until you qualify for a return to routine monitoring under [§ 141.625(c)](/cfr/40/141.625.md?p=c).


## Notes

### Source

Source: 71 FR 488, Jan. 4, 2006, unless otherwise noted.

### Authority

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.

### Source

Source: 40 FR 59570, Dec. 24, 1975, unless otherwise noted.