Clean Water Affordability Act

This bill amends the Federal Water Pollution Control Act to improve access to wastewater treatment services for low-income households. It changes how states can use funds in water pollution control revolving loan programs by requiring states to dedicate at least 20% of their annual federal capitalization grants to additional subsidies for ratepayers (water customers). The bill also revises subsidy calculations, allowing states to use up to 50% of their annual grants or the 10-year average of state deposits, whichever is greater, to help households maintain access to wastewater and stormwater treatment. These changes directly affect states managing water funds and the households relying on subsidized wastewater services.