CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER D—WATER PROGRAMS (Parts 100–149) > PART 146—UNDERGROUND INJECTION CONTROL PROGRAM: CRITERIA AND STANDARDS > SUBPART B—Criteria and Standards Applicable to Class I Wells (§146.11 to §146.16) > 146.11—Criteria and standards applicable to Class I nonhazardous wells.