---
kind: "section"
citation: "40 C.F.R. § 52.671"
title: "40"
number: "52.671"
heading: "Classification of regions."
url: "https://uscodex.org/cfr/40/52.671"
---

# §52.671. Classification of regions.


The Idaho plan was evaluated on the basis of the following classifications:


## Notes

### Amendments

[37 FR 10861, May 31, 1972, as amended at 45 FR 70261, Oct. 23, 1980; 47 FR 32534, July 28, 1982]

### Authority

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

### Amendments

[40 FR 5521, Feb. 6, 1975]

### Amendments

[37 FR 10861, May 31, 1972, as amended at 45 FR 70261, Oct. 23, 1980; 47 FR 32534, July 28, 1982]