40 CFR § 412.21 - Special definitions.

---
identifier: "/us/cfr/t40/s412.21"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 412.21 - Special definitions."
title_number: 40
title_name: "Protection of Environment"
section_number: "412.21"
section_name: "Special definitions."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "N"
subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"
part_number: "412"
part_name: "CONCENTRATED ANIMAL FEEDING OPERATIONS (CAFO) 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, 1314, 1316, 1317, 1318, 1342, 1361."
regulatory_source: "68 FR 7269, Feb. 12, 2003, unless otherwise noted."
cfr_part: "412"
---


# 412.21 Special definitions.

For the purposes of this subpart:

(a) *Dry lot* means a facility for growing ducks in confinement with a dry litter floor cover and no access to swimming areas.

(b) *Wet lot* means a confinement facility for raising ducks which is open to the environment, has a small number of sheltered areas, and with open water runs and swimming areas to which ducks have free access.