This bill amends the Safe Drinking Water Act to modify and expand eligibility for the State response to contaminants program . It revises the criteria for how states determine contaminant presence and streamlines the process for accessing federal assistance. The legislation specifically allows grants to be issued to states on behalf of disadvantaged communities , or those at risk of becoming disadvantaged, based on state affordability criteria. It also extends eligibility to communities with populations under 10,000 that lack the financial capacity to address contamination. Additionally, the bill enables states to receive grants for the benefit of owners of private drinking water wells not connected to public systems. These changes aim to ensure more vulnerable communities and private well owners can access crucial support for water contamination issues.