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42 U.S. Code § 300g - Coverage

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Subject to sections 300g–4 and 300g–5 of this title, national primary drinking water regulations under this part shall apply to each public water system in each State; except that such regulations shall not apply to a public water system—
which consists only of distribution and storage facilities (and does not have any collection and treatment facilities);
which obtains all of its water from, but is not owned or operated by, a public water system to which such regulations apply;
which does not sell water to any person; and
which is not a carrier which conveys passengers in interstate commerce.
(July 1, 1944, ch. 373, title XIV, § 1411, as added Pub. L. 93–523, § 2(a), Dec. 16, 1974, 88 Stat. 1662.)