42 U.S.C. § 300g - U.S. Code - Unannotated Title 42. The Public Health and Welfare § 300g. Coverage

(1) which consists only of distribution and storage facilities (and does not have any collection and treatment facilities);

(2) which obtains all of its water from, but is not owned or operated by, a public water system to which such regulations apply;

(3) which does not sell water to any person; and

(4) which is not a carrier which conveys passengers in interstate commerce.