; and (2) a summary of the activities carried out under the circuit rider program. (d) Authorization of appropriations (1) In general There is authorized to be appropriated to carry out this section $10,000,000 for the period of fiscal years 2021 through 2024. (2) Limitation on use of funds Of the amounts made available for grants under paragraph (1), not more than 2 percent may be used to pay the administrative costs of the Administrator. . 2004. Small publicly owned treatment works efficiency grant program Title II of the Federal Water Pollution Control Act ( 33 U.S.C. 1281 et seq.) (as amended by section 2003) is amended by adding at the end the following: 224. Small publicly owned treatment works efficiency grant program (a) Establishment Subject to the availability of appropriations, not later than 180 days after the date of enactment of this section, the Administrator shall establish an efficiency grant program (referred to in this section as the efficiency grant program ) under which the Administrator shall award grants to eligible entities for the replacement or repair of equipment that improves water or energy efficiency of small publicly owned treatment works, as identified in an efficiency audit. (b) Eligible entities The Administrator may award a grant under the efficiency grant program to an owner or operator of a small publicly owned treatment works that serves— (1) a population of not more than 10,000 people; or (2) a disadvantaged community. (c) Report Not later than 180 days after the date on which the Administrator establishes the efficiency grant program, and every 180 days thereafter, the Administrator shall submit to Congress a report describing— (1) each recipient of a grant under the efficiency grant program