The Pipeline Accountability Act of 2025 aims to significantly enhance pipeline safety, environmental protection, public engagement, and accountability within the Pipeline and Hazardous Materials Safety Administration (PHMSA). It introduces new requirements for how PHMSA considers environmental and climate impacts when prescribing standards and removes certain cost-benefit analysis requirements that could impede safety improvements. The bill also reforms technical safety standards committees by prohibiting individuals with financial interests in the pipeline industry from serving and requiring financial disclosures. Key safety provisions include applying regulations to existing pipelines, ensuring standards are not limited by a pipeline's pre-existence. It mandates the installation of rupture-mitigation valves on covered pipelines in high consequence areas, requiring operators to isolate ruptured segments within 30 minutes. The bill also directs PHMSA to complete rulemaking for the safety of carbon dioxide pipelines , considering measures like potential impact area determination, odorants, fracture protection, and emergency response plans, while also requiring new regulations on geohazards and public notification of hazards. A significant provision addresses blending in natural gas systems by requiring a Comptroller General study on the impacts of hydrogen blending. Crucially, it prohibits pipeline operators from transporting hydrogen (beyond trace amounts) in natural gas distribution pipelines until Congress explicitly provides for safe regulation. This aims to prevent unforeseen risks associated with new fuel mixtures in existing infrastructure. The legislation modifies the Natural Gas Distribution Infrastructure Safety and Modernization Grant Program to include retiring pipeline segments and encouraging non-emitting alternatives , allocating at least 20 percent of funds for these alternatives. It also authorizes substantial additional funding for this program. Furthermore, the bill mandates new or revised regulations for underground natural gas storage , focusing on risk management, emergency response, and preventing single points of failure. To bolster public engagement, the bill establishes an Office of Public Engagement within PHMSA, requiring it to coordinate assistance, conduct proactive outreach, and establish a standardized process for receiving and addressing public inquiries and complaints. This office is specifically tasked with prioritizing input from environmental justice communities and providing accessible communications and services. It also authorizes $12 million annually for the office's operations. Increased transparency is a core theme, with requirements for PHMSA to hold public hearings on all proposed rules and revisions. Operators of covered facilities must disclose extensive safety data to the public, including information on transported substances, decommissioning plans, emergency response plans, and carbon dioxide dispersion modeling results. This includes annual notifications to impacted residents and first responders, and the provision of additional detailed safety information upon request. Operators of natural gas pipelines must also report blended products exceeding one percent by volume. Finally, the bill strengthens accountability by prohibiting pipeline facilities from releasing gas or hazardous liquid in quantities that would require incident reporting. It expands the ability of private persons to bring civil actions against violators or the Secretary for failing to perform non-discretionary duties, including seeking civil penalties and injunctive relief. The legislation also modifies maximum civil penalties for related series of violations, underscoring a commitment to stricter enforcement.