received under this section may be used for engineering, design, construction, and final testing of an alternative water source project designed to meet critical water supply needs. (2) Exclusion A grant received under this section may not be used for planning, a feasibility study, operation, maintenance, replacement, repair, or rehabilitation. (f) Cost sharing The Federal share of the eligible costs of an alternative water source project carried out using a grant under this section shall be not more than 50 percent. (g) Report Not later than September 30, 2023, the Administrator shall submit to Congress a report describing the results of the grant program established under subsection (b), including progress toward meeting the critical water supply needs of the grant recipients. (h) Authorization of appropriations There is authorized to be appropriated to carry out this section $500,000,000 for fiscal year 2020 and each fiscal year thereafter, to remain available until expended. (i) Policy Nothing in this section affects the application of section 101(g) and all of the provisions of this section shall be carried out in accordance with that section. . 304. Mandatory spending for water infrastructure programs (a) Clean Water programs (1) In general At the beginning of each fiscal year, the Administrator shall obligate for the fiscal year— (A) $174,250,000 to make grants to nonprofit organizations to provide technical assistance and disseminate information under section 104(b)(8) of the Federal Water Pollution Control Act ( 33 U.S.C. 1254(b)(8) )