underground source of drinking water
(3) Effective twelve months after November 8, 1984 , the placement of any liquid which is not a hazardous waste in a landfill for which a permit is required under section 6925(c) of this title or which is operating pursuant to interim status granted under section 6925(e) of this title is prohibited unless the owner or operator of such landfill demonstrates to the Administrator, or the Administrator determines, that— (A) the only reasonably available alternative to the placement in such landfill is placement in a landfill or unlined surface impoundment, whether or not permitted under section 6925(c) of this title or operating pursuant to interim status under section 6925(e) of this title , which contains, or may reasonably be anticipated to contain, hazardous waste; and (B) placement in such owner or operator’s landfill will not present a risk of contamination of any underground source of drinking water. As used in subparagraph (B), the term “underground source of drinking water” has the same meaning as provided in regulations under the Safe Drinking Water Act (title XIV of the Public Health Service Act) [ 42 U.S.C. 300f et seq.].
42 USC § 6924(c)(3)
None identified, default scope is assumed to be the parent (subchapter III) of this section.