Public water system
Public water system means a system for the provision to the public of piped water for human consumption, if such system has at least fifteen service connections or regularly serves at least twenty-five individuals. Such term includes:
(1) Any collection, treatment, storage, and distribution facilities under control of the operator of such system and used primarily in connection with such system; and
(2) Any collection or pretreatment storage facilities not under such control which are used primarily in connection with such system.
40 CFR § 191.22
Unless otherwise indicated in this subpart, all terms have the same meaning as in subparts A and B of this part.