40 CFR § 148.2 - Definitions.

---
identifier: "/us/cfr/t40/s148.2"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 148.2 - Definitions."
title_number: 40
title_name: "Protection of Environment"
section_number: "148.2"
section_name: "Definitions."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "D"
subchapter_name: "WATER PROGRAMS"
part_number: "148"
part_name: "HAZARDOUS WASTE INJECTION RESTRICTIONS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "Secs. 3004, Resource Conservation and Recovery Act, 42 U.S.C. 6901"
regulatory_source: "53 FR 28154, July 26, 1988, unless otherwise noted."
cfr_part: "148"
---


# 148.2 Definitions.

*Injection interval* means that part of the injection zone in which the well is screened, or in which the waste is otherwise directly emplaced.

*Transmissive fault or fracture* is a fault or fracture that has sufficient permeability and vertical extent to allow fluids to move between formations.