---
kind: "section"
citation: "40 C.F.R. § 63.7681"
title: "40"
number: "63.7681"
heading: "Am I subject to this subpart?"
url: "https://uscodex.org/cfr/40/63.7681"
---

# §63.7681. Am I subject to this subpart?


You are subject to this subpart if you own or operate an iron and steel foundry that is (or is part of) a major source of hazardous air pollutant (HAP) emissions. Your iron and steel foundry is a major source of HAP for purposes of this subpart if it emits or has the potential to emit any single HAP at a rate of 10 tons or more per year or any combination of HAP at a rate of 25 tons or more per year or if it is located at a facility that emits or has the potential to emit any single HAP at a rate of 10 tons or more per year or any combination of HAP at a rate of 25 tons or more per year as defined in [§ 63.2](/cfr/40/63.2.md).


## Notes

### Amendments

[69 FR 21923, Apr. 22, 2004, as amended at 73 FR 7218, Feb. 7, 2008]

### Source

Source: 69 FR 21923, Apr. 22, 2004, unless otherwise noted.

### Authority

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

### Source

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

### Amendments

[69 FR 21923, Apr. 22, 2004, as amended at 73 FR 7218, Feb. 7, 2008]