The main purpose of this legislation is to improve access to water and wastewater systems in rural areas by modifying existing grant programs. It aims to provide financial support to nonprofit organizations that help individuals construct, refurbish, and maintain their own water well and wastewater systems. Key provisions of the legislation include the establishment of grants to nonprofit organizations, which can then provide loans and subgrants to individuals. The bill specifies that these financial aids are targeted at low- and moderate-income households.