40 CFR § 450.11 - General definitions.

---
identifier: "/us/cfr/t40/s450.11"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 450.11 - General definitions."
title_number: 40
title_name: "Protection of Environment"
section_number: "450.11"
section_name: "General definitions."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "N"
subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"
part_number: "450"
part_name: "CONSTRUCTION AND DEVELOPMENT POINT SOURCE CATEGORY"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "33 U.S.C. 1311, 1312, 1314, 1316, 1341, 1342, 1361 and 1370."
regulatory_source: "74 FR 63057, Dec. 1, 2009, unless otherwise noted."
cfr_part: "450"
---


# 450.11 General definitions.

(a) *New source.* New source means any source, whose discharges are defined in 40 CFR 122.26(b)(14)(x) and (b)(15), that commences construction activity after the effective date of this rule.

(b) *Infeasible.* Infeasible means not technologically possible, or not economically practicable and achievable in light of best industry practices.

[74 FR 63057, Dec. 1, 2009, as amended at 79 FR 12667, Mar. 6, 2014]