The Typhoon Mawar Reconstruction Act authorizes the Federal Emergency Management Agency to provide financial assistance for repairs and reconstruction of critical infrastructure damaged by Typhoon Mawar in Guam and the Commonwealth of the Northern Mariana Islands. The bill covers repairs to hospitals, navigational waterways, power generation and transmission systems, and communication infrastructure, and allows federal agencies to provide direct assistance to communities instead of just financial reimbursement. A key provision guarantees that the federal government will cover 100 percent of eligible costs for these repairs, removing the typical cost-sharing requirement that states and territories normally bear. The legislation applies to existing disaster declarations from the typhoon as well as future major disaster declarations affecting these territories. This act prioritizes rebuilding these essential systems to meet modern safety and resilience standards to better withstand future natural disasters.