The "Fighting Fibers Act of 2025" mandates that, starting January 1, 2030, all new residential and commercial washing machines sold in the United States must incorporate a microfiber filtration system . This system must be active across all washing cycles, either integrated into the machine or provided as an in-line filter, and must achieve a filtration standard of not greater than 100 micrometers or an equivalent efficacy determined by the EPA and Department of Energy. Additionally, these washing machines must bear a conspicuous label instructing consumers to regularly check and dispose of captured microfibers, with civil penalties imposed for non-compliance. Beyond these manufacturing requirements, the bill directs the Environmental Protection Agency to conduct a comprehensive nationwide study on microfibers. This study will investigate their presence, sources, and pathways in the human body and environment, assessing potential toxic effects on human health and the environment. It will also examine any inequitable impact on environmental justice communities, with a public report to Congress due within one year of the Act's enactment.