point source
The term point source means any discernible, confined and discrete conveyance, including but not limited to any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container, rolling stock, concentrated animal feeding operation, or vessel or other floating craft, from which pollutants are or may be discharged.
Source
40 CFR § 401.11
Scoping language
For the purposes of parts 402 through 699 of this subchapter: