40 CFR § 435.61 - Specialized definitions.

---
identifier: "/us/cfr/t40/s435.61"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 435.61 - Specialized definitions."
title_number: 40
title_name: "Protection of Environment"
section_number: "435.61"
section_name: "Specialized definitions."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "N"
subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"
part_number: "435"
part_name: "OIL AND GAS EXTRACTION POINT SOURCE CATEGORY"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "33 U.S.C. 1251, 1311, 1314, 1316, 1317, 1318, 1342 and 1361."
regulatory_source: "44 FR 22075, Apr. 13, 1979, unless otherwise noted."
cfr_part: "435"
---


# 435.61 Specialized definitions.

For the purpose of this subpart:

(a) Except as provided below, the general definitions, abbreviations, and methods of analysis set forth in 40 CFR part 401 shall apply to this subpart.

(b) The term “onshore” shall mean all land areas landward of the inner boundary of the territorial seas as defined in 40 CFR 125.1(gg).

(c) The term “well” shall means crude oil producing wells and shall not include gas wells or wells injecting water for disposal or for enchanced recovery of oil or gas.

(d) The term “gas well” shall mean any well which produces natural gas in a ratio to the petroleum liquids produced greater than 15,000 cubic feet of gas per 1 barrel (42 gallons) of petroleum liquids.