life of the product, taking energy, water, and wastewater cost savings into account. (d) Regulations Not later than 180 days after the date of enactment of this Act, the Administrator of the Environmental Protection Agency shall issue regulations to carry out this section. 4. Early Adopter Water Efficient Products Incentive Programs (a) Definitions In this section: (1) Administrator The term Administrator means the Administrator of the Environmental Protection Agency. (2) Eligible entity The term eligible entity means a State government, local or county government, tribal government, wastewater or sewage utility, municipal water authority, energy utility, water utility, or nonprofit organization that meets the requirements of subsection (b). (3) Incentive program The term incentive program means a program for administering financial incentives for consumer purchase and installation of residential water efficient products and services as described in subsection (b)(1). (4) Residential water efficient product or service (A) In general The term residential water efficient product or service means a product or service for a single-family or multifamily residence or its landscape that is rated for water efficiency and performance— (i) by the WaterSense program