This Act may be cited as the Tribal Water Infrastructure Grants Expansion Act.

(a) In general Section 518(c) of the Federal Water Pollution Control Act (33 U.S.C. 1377(c)U.S. Code — Title 33, Section 1377(c)View official source on GovInfo) is amended— (1) by striking paragraphs (1) and (2) and inserting the following: (1) In general For each fiscal year, the Administrator shall reserve, of the funds made available to carry out title VI (before allotments to the States under section 604(a)), the greater of— (A) 2 percent of such funds; or (B) $30,000,000. (2) Use of funds (A) Grants Funds reserved under this subsection shall be available only for grants to entities described in paragraph (3) for— (i) projects and activities eligible for assistance under section 603(c); and (ii) training, technical assistance, and educational programs relating to the operation and management of treatment works eligible for assistance pursuant to section 603(c). (B) Limitation Not more than $2,000,000 of such reserved funds may be used for grants under subparagraph (A)(ii).; and (2) in paragraph (3)— (A) in the header, by striking Use of funds and inserting Eligible entities; and (B) by striking for projects and activities eligible for assistance under section 603(c) to serve and inserting to. (b) Additional assistance (1) Authorization of appropriations In addition to amounts otherwise made available under title VI of the Federal Water Pollution Control Act (33 U.S.C. 1381 et seq.U.S. Code — Title 33, Section 1381 and followingView official source on GovInfo), there is authorized to be appropriated $500,000,000 for each of fiscal years 2026 through 2031 to make grants, in cooperation with the Director of the Indian Health Service, to entities described in section 518(c)(3) of the Federal Water Pollution Control Act (33 U.S.C. 1377U.S. Code — Title 33, Section 1377View official source on GovInfo) for— (A) projects and activities eligible for assistance under section 603(c) of such Act (33 U.S.C. 1383U.S. Code — Title 33, Section 1383View official source on GovInfo); and (B) training, technical assistance, and educational programs related to the operation and management of treatment works eligible for assistance pursuant to such section 603(c). (2) No matching requirement The Administrator may not require an entity receiving a grant under paragraph (1) to provide, as a condition of receiving such grant, a share of the cost of the project or activity for which such grant was made. (3) Limitation Not more than $2,000,000 of amounts made available in a fiscal year to carry out this subsection may be used for grants under paragraph (1)(B). (4) Application of other requirements The requirements of sections 513 and 608 of the Federal Water Pollution Control Act (33 U.S.C. 1372U.S. Code — Title 33, Section 1372View official source on GovInfo, 1388) shall apply to any project for the construction, alteration, maintenance, or repair of treatment works for which a grant is received under paragraph (1).