Section 1 Corrosion control treatment steps for lead and copper in drinking water
“(14) Lead and copper in drinking water
“(A) Definitions—In this paragraph:
“(i) Action level—The term action level, with respect to lead or copper, means the concentration of lead or copper in water described in section 141.80(c) of title 40, Code of Federal Regulations (or a successor regulation).
“(ii) Medium water system—The term medium water system means a public water system that serves—
“(I) not fewer than 3,300 persons; and
“(II) not more than 50,000 persons.
“(iii) Optimal corrosion control treatment—The term optimal corrosion control treatment means the corrosion control treatment that—
“(I) minimizes the concentration of lead and copper at the taps of users; and
“(II) ensures that the corrosion control treatment does not cause the water system to violate any national primary drinking water regulation.
“(iv) Small water system—The term small water system means a public water system that serves not more than 3,300 persons.
“(v) State agency—The term State agency means—
“(I) the agency of the State or tribal government that has jurisdiction over a small or medium water system; or
“(II) during any period in which a State or tribal government does not have primary enforcement responsibility under section 1413, the applicable Regional Administrator of the Agency.
“(B) Corrosion control treatment steps and deadlines for small and medium water systems
“(i) Initial tap sampling—Except as determined by the Administrator, a small or medium water system shall conduct initial tap sampling in accordance with sections 141.86(d)(1) and 141.87(b) of title 40, Code of Federal Regulations (or successor regulations) until the date on which the small or medium water system—
“(I) exceeds the lead or copper action level; or
“(II) becomes eligible for reduced monitoring under section 141.86(d)(4) of title 40, Code of Federal Regulations (or a successor regulation).
“(ii) Corrosion control treatment—Except as determined by the Administrator, a small or medium water system that exceeds a lead or copper action level shall carry out the following corrosion control treatment steps:
“(I) Water system recommendation—Not later than 120 days after the last day of the monitoring period in which the small or medium water system exceeded a lead or copper action level, the small or medium water system shall recommend optimal corrosion control treatment in accordance with section 141.82(a) of title 40, Code of Federal Regulations (or a successor regulation).
“(II) Optimal control treatment deadlines
“(aa) Corrosion control studies
“(AA) In general—Not later than 90 days after the last day of the monitoring period in which the small or medium water system exceeded a lead or copper action level, the State agency may require the small or medium water system to perform corrosion control studies in accordance with section 141.82(b) of title 40, Code of Federal Regulations (or a successor regulation).
“(BB) Deadline—Not later than 1 year after the date on which the State agency requires that the corrosion control studies described in subitem (AA) be conducted, the small or medium water system shall complete the corrosion control studies in accordance with section 141.82(c) of title 40, Code of Federal Regulations (or a successor regulation).
“(bb) Designation by the State—If the State agency does not require the small or medium water system to perform the corrosion control studies described in item (aa), not later than 90 days after the last day of the monitoring period in which the small or medium water system exceeded the lead or copper action level, the State agency shall designate optimal control treatment in accordance with section 141.82(d) of title 40, Code of Federal Regulations (or a successor regulation).
“(cc) Installation—Not later than 1 year after the date on which the State agency designates optimal control treatment described in item (bb), the small or medium water system shall install the optimal corrosion control treatment in accordance with section 141.82(e) of title 40, Code of Federal Regulations (or a successor regulation).
“(III) Follow-up sampling—Not later than 2 years after the date on which a State agency designates optimal control treatment described in subclause (II)(bb), the small or medium water system shall complete follow-up sampling in accordance with sections 141.86(d)(2) and 141.87(c) of title 40, Code of Federal Regulations (or successor regulations).
“(IV) Review—Not later than 180 days after the date on which a small or medium water system completes the follow-up sampling described in subclause (III), the State agency shall—
“(aa) review the installation of optimal control treatment in the small or medium water system; and
“(bb) designate optimal water quality control parameters in accordance with section 141.82(f) of title 40, Code of Federal Regulations (or a successor regulation).
“(V) Compliance and tap sampling—Following the review conducted under subclause (IV), the small or medium water system shall—
“(aa) operate in compliance with the State agency-designated optimal water quality control parameters in accordance with section 141.82(g) of title 40, Code of Federal Regulations (or a successor regulation); and
“(bb) continue to conduct tap sampling in accordance with sections 141.86(d)(3) and 141.87(d) of title 40, Code of Federal Regulations (or successor regulations).”