The "Fighting Fibers Act of 2025" aims to reduce microfiber pollution by requiring all new washing machines sold in the United States to contain a microfiber filtration system . Beginning January 1, 2030, these systems must be active across all washing cycles, either integrated into the machine or included as an in-line filter, and possess a mesh size of no more than 100 micrometers or an equivalent standard determined by the Environmental Protection Agency (EPA) Administrator and the Secretary of Energy. Each compliant washing machine must display a conspicuous label informing consumers about the filter and instructing them to regularly check and dispose of captured lint. The EPA Administrator, in conjunction with the Secretary of Energy, is tasked with ensuring compliance, promulgating regulations, and assessing civil penalties for violations, which can reach up to $30,000 for subsequent offenses. Beyond filtration requirements, the bill also mandates a comprehensive nationwide study by the EPA on the presence, sources, and pathways of microfibers in the human body and environment. This study will investigate potential toxic effects on human health and the environment, specifically examining any disproportionate impacts on environmental justice communities, with a report due to Congress within one year of enactment.