This bill, titled the Coastal Communities Ocean Acidification Act of 2025, significantly amends the Federal Ocean Acidification Research And Monitoring Act of 2009. Its primary purpose is to strengthen the federal response to ocean acidification by mandating enhanced collaboration between the Secretary of Commerce, acting through the National Oceanic and Atmospheric Administration (NOAA), and State and local governments , along with Indian Tribes and Native Hawaiian organizations . This collaboration will focus on critical activities such as community vulnerability assessments, research planning, and the development of adaptation strategies. The legislation requires NOAA to establish an ongoing mechanism for input from a broad range of stakeholders, including affected industry members, coastal communities, Indigenous knowledge groups, and non-Federal resource managers, to inform research and management decisions. Furthermore, it expands the membership of the Advisory Board to include two representatives from Indian Tribes, Native Hawaiian organizations, Tribal organizations, and Tribal consortia , ensuring diverse perspectives are incorporated. The Advisory Board is also tasked with developing a policy for engagement and coordination specifically with Indian Tribes affected by ocean and coastal acidification. The bill updates requirements for the strategic research plan to reflect this broader stakeholder engagement. It also directs the Secretary to build upon existing activities and collaborate with these governmental and Indigenous entities to improve systems and programs addressing ocean acidification. A key provision prioritizes underserved populations and entities in the use of NOAA's resources when carrying out these collaborative efforts.