This regulation applies to each public water system in the State except that it does not apply to a public water system which satisfies all of the following:
A. Consists only of distribution and storage facilities, and does not have any collection and treatment facilities;
B. Obtains all of its water from, but is not owned or operated by, a supplier of water to which this regulation applies;
C. Does not sell water to any person; and
D. Is not a carrier which conveys passengers in interstate commerce.