---
kind: "section"
citation: "40 C.F.R. § 63.7940"
title: "40"
number: "63.7940"
heading: "By what date must I conduct performance tests or other initial compliance demonstrations?"
url: "https://uscodex.org/cfr/40/63.7940"
---

# §63.7940. By what date must I conduct performance tests or other initial compliance demonstrations?

- (a) You must conduct a performance test or design evaluation for each existing affected source within 180 calendar days after the compliance date that is specified in [§ 63.7883](/cfr/40/63.7883.md).
- (b) For each work practice standard that applies to you where initial compliance is not demonstrated using a performance test or design evaluation, you must demonstrate initial compliance within 30 calendar days after the compliance date that is specified in [§ 63.7883](/cfr/40/63.7883.md) for your affected source.
- (c) For new sources, you must conduct initial performance tests and other initial compliance demonstrations according to the provisions in [§ 63.7(a)(2)](/cfr/40/63.7.md?p=a-2).

## Notes

### Amendments

[68 FR 58190, Oct. 8, 2003, as amended at 71 FR 69019, Nov. 29, 2006]

### Source

Source: 68 FR 58190, Oct. 8, 2003, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Source

Source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.

### Amendments

[68 FR 58190, Oct. 8, 2003, as amended at 71 FR 69019, Nov. 29, 2006]