StacksVerified U.S. regulatory reference

40 CFR §147.3009

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The area of review shall be defined as follows:
  1. (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) (1) and (2) of this chapter except that the radius shall be one-half mile.
  2. (b)Class I and III wells. The area of review for Class I and III wells are well fields which may be either:
    1. (1)An area defined by a radius two and one-half miles from the well or well field; or
    2. (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. (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) of this chapter.