; or (II) to encourage sustainable project planning, design, and construction. (B) Affordability criteria (i) In general Not later than January 1, 2020, and after providing notice and an opportunity for public comment, a coastal State shall establish affordability criteria to assist in identifying municipalities that would experience a significant hardship raising the revenue necessary to finance a project or activity eligible for assistance under paragraph (3) if additional subsidization is not provided. (ii) Basis of criteria The criteria under clause (i) shall be based on income and unemployment data, population trends, and other data determined relevant by the coastal State, including whether the project or activity is to be carried out in an economically distressed area, as described in section 301 of the Public Works and Economic Development Act of 1965 ( 42 U.S.C. 3161 ). (C) Additional subsidization (i) In general A coastal State may provide additional subsidization in a fiscal year under this paragraph only if the total amount appropriated for making capitalization grants to all coastal States under this section for the fiscal year exceeds $500,000,000. (ii) Limitation Except as provided in clause (iii), a coastal State may use not more than 30 percent of the total amount received by the coastal State in capitalization grants under subsection (b) for a fiscal year for providing additional subsidization under this paragraph. (iii) Exception If, in a fiscal year, the amount appropriated for making capitalization grants to all coastal States under this section exceeds $500,000,000 by a percentage that is less than 30 percent, clause (ii) shall be applied by substituting that percentage for 30 percent. (c) Compliance (1) In general If the Administrator determines that a coastal State has not complied with its agreement with the Administrator under subsection (a)(3) or any other requirement of this section, the Administrator shall notify the coastal State of such noncompliance and the necessary corrective