---
kind: "section"
citation: "40 C.F.R. § 147.3009"
title: "40"
number: "147.3009"
heading: "Area of review."
url: "https://uscodex.org/cfr/40/147.3009"
---

# §147.3009. Area of review.


The area of review shall be defined as follows:

- (a) **Class II wells.** The area of review for Class II permits and area permits shall be defined by a fixed radius as described in [§ 146.6(b)](/cfr/40/146.6.md?p=b) (1) and (2) of this chapter except that the radius shall be one-half mile.
- (b) **Class I and III wells.** The area of review for Class I and III wells are well fields which may be either:
  - (1) An area defined by a radius two and one-half miles from the well or well field; or
  - (2) An area one-quarter mile from the well or well field where the well field production at the times exceeds injection to produce a net withdrawal; or
  - (3) A suitable distance, not less than one-quarter mile, proposed by the owner or operator and approved by the Director based upon a mathematical calculation such as that found in [§ 146.6(a)(2)](/cfr/40/146.6.md?p=a-2) of this chapter.

## Notes

### Source

Source: 53 FR 43104, Oct. 25, 1988, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 300f et seq.; and 42 U.S.C. 6901 et seq.

### Source

Source: 49 FR 20197, May 11, 1984, unless otherwise noted.