42 U.S.C. § 300j–17

section 346a(p)(3)(B) of title 21section 346a(p) of title 21section 346a(p) of title 21In addition to the substances referred to in the Administrator may provide for testing under the screening program authorized by , in accordance with the provisions of , of any other substance that may be found in sources of drinking water if the Administrator determines that a substantial population may be exposed to such substance.