; (II) operation and maintenance of water and wastewater systems; (III) asset management; and (IV) servicing any debt incurred or to be incurred to finance the other costs referred to in this clause. (ii) Substantial impact In making a determination of economic impact under subparagraph (B), the Administrator (or the State) shall consider the impact on a person to be substantial if the cumulative costs paid by the person exceeds, or is projected to exceed, 2 percent of the person’s annual household income. (iii) Widespread impact In making a determination of economic impact under subparagraph (B), the Administrator (or the State) shall consider the impact to be widespread if 20 percent or more of persons in the service area of the municipality face a substantial impact described in clause (ii). (D) Additional requirements In making a determination of economic affordability under this subsection, the Administrator (or the State) shall not base the determination on— (i) median household income in the service area of the municipality; or (ii) an expected minimum level of expenditure on the provision of water and wastewater services by a municipality. (8) Flexibility (A) In general Nothing in this subsection reduces or eliminates any flexibility available under this Act, including the authority of a State to— (i) revise a water quality standard after a use attainability analysis under section 131.10(g) of title 40, Code of Federal Regulations (as in effect on the date of enactment of this subsection)