This legislation, known as the "Improving Interagency Coordination for Pipeline Reviews Act," aims to enhance and streamline the interagency review process for natural gas pipeline projects. It designates the Federal Energy Regulatory Commission (FERC) as the exclusive lead agency for conducting National Environmental Policy Act (NEPA) reviews related to authorizations under Section 3 and certificates of public convenience and necessity under Section 7 of the Natural Gas Act. This centralizes the environmental review process, ensuring a single, coordinated approach. FERC's responsibilities as the lead agency include coordinating early with participating agencies to develop usable information for their respective Federal authorizations and taking necessary actions to facilitate the expeditious resolution of its project-related NEPA review. Other agencies are required to give deference , to the maximum extent authorized by law, to the scope of the NEPA review determined appropriate by FERC. This provision seeks to prevent redundant or conflicting environmental assessments. The bill establishes a structured process for identifying and designating participating agencies , which are federal, state, local, or tribal entities that may issue a Federal authorization or are required to consult with FERC. Agencies are invited to participate and are designated unless they explicitly state they lack jurisdiction, special expertise, or do not intend to submit comments. Non-designated agencies face restrictions, including being unable to conduct supplemental NEPA reviews or have their comments considered by FERC, unless legally necessary and based on information unobtainable during FERC's review. Regarding water quality impacts , the bill waives the requirement for applicants to provide a certification under Section 401 of the Federal Water Pollution Control Act. Instead, states or interstate agencies can propose terms or conditions to FERC for inclusion in the authorization, which FERC may adopt if it finds them necessary for compliance with applicable water quality standards. The legislation also sets a deadline for Federal authorizations at 90 days after FERC completes its NEPA review, unless otherwise established by law, and mandates concurrent reviews by federal and state agencies to meet FERC's schedules. To promote accountability, transparency, and efficiency , the bill requires federal and state agencies to formulate plans for concurrent reviews and report progress to FERC. If an agency misses a deadline, its head must notify Congress and FERC and provide an implementation plan. FERC is also tasked with tracking and publicly displaying information on the status of required actions for multi-agency authorizations, including expected completion dates and reasons for delays. Furthermore, FERC must consult with the Transportation Security Administration on pipeline security during its review process.