Under a settlement with the US Department of Justice and the US Environmental Protection Agency, the Puerto Rico Aqueduct and Sewer Authority (PRASA) has agreed to make major upgrades, improve inspections and cleaning of existing facilities within the Puerto Nuevo system and continue improvements to its systems island-wide. The Puerto Nuevo sewer system serves the municipalities of San Juan, Trujillo Alto, and portions of Bayamón, Guaynabo and Carolina. Under the agreement, PRASA will spend approximately US$1.5 billion to make necessary improvements and undertake a comprehensive operation and maintenance programme in the Puerto Nuevo sanitary sewer system, including conducting a comprehensive analysis of the system to determine whether subsequent investments must be made to ensure the system is brought into legal compliance.