of fiscal years 2021 through 2025, to remain available until expended. (e) Definitions In this section: (1) Administrator The term Administrator means the Administrator of the Environmental Protection Agency. (2) Covered perfluoroalkyl substance The term covered perfluoroalkyl substance means perfluorooctanoic acid, perfluorooctane sulfonic acid, or a salt associated with perfluorooctanoic acid or perfluorooctane sulfonic acid. (3) Effluent limitation The term effluent limitation means an effluent limitation under section 301(b) of the Federal Water Pollution Control Act ( 33 U.S.C. 1311 ). (4) Introduction The term introduction means the introduction of pollutants into treatment works, as described in section 307(b) of the Federal Water Pollution Control Act ( 33 U.S.C. 1317 ). (5) Measurable The term measurable means, with respect to a chemical substance or class or category of chemical substances, capable of being measured using— (A) test procedures established under section 304(h) of the Federal Water Pollution Control Act ( 33 U.S.C. 1314 )