---
kind: "section"
citation: "40 C.F.R. § 141.503"
title: "40"
number: "141.503"
heading: "What does subpart T require?"
url: "https://uscodex.org/cfr/40/141.503"
---

# §141.503. What does subpart T require?


There are seven requirements of this subpart, and you must comply with all requirements that are applicable to your system. These requirements are:

- (a) You must cover any finished water reservoir that you began to construct on or after March 15, 2002 as described in §§ [141.510](/cfr/40/141.510.md) and [141.511](/cfr/40/141.511.md);
- (b) If your system is an unfiltered system, you must comply with the updated watershed control requirements described in [§§ 141.520-141.522](/cfr/40/141.520-141.522.md);
- (c) If your system is a community or non-transient non-community water systems you must develop a disinfection profile as described in [§§ 141.530-141.536](/cfr/40/141.530-141.536.md);
- (d) If your system is considering making a significant change to its disinfection practices, you must develop a disinfection benchmark and consult with the State for approval of the change as described in [§§ 141.540-141.544](/cfr/40/141.540-141.544.md);
- (e) If your system is a filtered system, you must comply with the combined filter effluent requirements as described in [§§ 141.550-141.553](/cfr/40/141.550-141.553.md);
- (f) If your system is a filtered system that uses conventional or direct filtration, you must comply with the individual filter turbidity requirements as described in [§§ 141.560-141.564](/cfr/40/141.560-141.564.md); and
- (g) You must comply with the applicable reporting and recordkeeping requirements as described in §§ [141.570](/cfr/40/141.570.md) and [141.571](/cfr/40/141.571.md).

## Notes

### Source

Source: 67 FR 1839, Jan. 14, 2002, 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.