---
kind: "section"
citation: "40 C.F.R. § 62.14403"
title: "40"
number: "62.14403"
heading: "What happens if I modify an existing HMIWI?"
url: "https://uscodex.org/cfr/40/62.14403"
---

# §62.14403. What happens if I modify an existing HMIWI?

- (a) If you commenced modification (defined in [40 CFR 62.14490](/cfr/40/62.14490.md)) of an existing HMIWI after April 6, 2010, you are subject to [40 CFR part 60](/cfr/40/part60.md), [subpart Ec](/cfr/40/subpartEc.md) ([40 CFR 60.50c through 60.58c](/cfr/40/60.50c..60.58c.md)), as amended, and you are not subject to this subpart, except as provided in [paragraph (b)](#b) of this section.
- (b) If you made physical or operational changes to your existing HMIWI solely for the purpose of complying with this subpart, these changes are not considered a modification and you are not subject to [40 CFR part 60](/cfr/40/part60.md), [subpart Ec](/cfr/40/subpartEc.md) ([40 CFR 60.50c through 60.58c](/cfr/40/60.50c..60.58c.md)), as amended. You remain subject to this subpart.

## Notes

### Amendments

[78 FR 28067, May 13, 2013]

### Source

Source: 65 FR 49881, Aug. 15, 2000, unless otherwise noted.

### Authority

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

### Source

Source: 43 FR 51393, Nov. 3, 1978, unless otherwise noted.

### Amendments

[78 FR 28067, May 13, 2013]