IIJA requires the EPA to provide funding to carry out groundwater research on enhanced aquifer use and recharge to support sole-source aquifers, in which at least 50% of funding is used to provide one grant to a state, local government unit, or Tribe to carry out activities to directly support this research and the remainder is provided to one research center. Creates an enhanced aquifer use and recharge research program. States can use 50% of the program’s funds to engage in activities supporting this research with the remaining funds being distributed to one research center. Allocates $5 million annually for fiscal years 2022 through 2026.