The All Appropriate Inquiries rule
40 CFR part 312 is the federal All Appropriate Inquiries rule, the rule a Phase I Environmental Site Assessment is performed to satisfy. It has 15 sections. Each has a page below showing the section as the regulation prints it, in the edition revised as of July 1, 2025.
15Sections
3Subparts
July 1, 2025Revised as of
Subpart A—Introduction
Subpart B—Definitions and References
Subpart C—Standards and Practices
- § 312.20 All appropriate inquiries
- § 312.21 Results of inquiry by an environmental professional
- § 312.22 Additional inquiries
- § 312.23 Interviews with past and present owners, operators, and occupants
- § 312.24 Reviews of historical sources of information
- § 312.25 Searches for recorded environmental cleanup liens
- § 312.26 Reviews of Federal, State, Tribal, and local government records
- § 312.27 Visual inspections of the facility and of adjoining properties
- § 312.28 Specialized knowledge or experience on the part of the defendant
- § 312.29 The relationship of the purchase price to the value of the property, if the property was not contaminated
- § 312.30 Commonly known or reasonably ascertainable information about the property
- § 312.31 The degree of obviousness of the presence or likely presence of contamination at the property, and the ability to detect the contamination by appropriate investigation