Manila Water Company (Manila Water) has been investing PHP37.3 billion (US$684 million) in Three-River System Wastewater Masterplan in Manila, Philippines.

The project involves the construction of wastewater treatment facilities and a sewer network across the Marikina River, San Juan River, Pasig River, and Laguna Lake systems.

The scope of work includes:

• to collect, convey, and treat wastewater generated within their respective catchment areas;
• the Mandaluyong West, Quezon City South, and San Juan South Sewerage System which covers portions of catchments draining towards San Juan River and Pasig River systems have a project cost of PHP20 billion (US$367 million) and will have the capacity to treat 60 million liters of wastewater per day conveyed through a 53 km sewer network;
• construction of the remaining segments of the North and South Pasig Sewerage System, to help protect the Pasig River System With a combined project cost of PHP2.8 billion (US$51.3 million);
• the PHP1.6 billion (US$29.3 million) Hinulugang Taktak Sewerage System east of Metro Manila which is already taking shape in Antipolo City will treat 16 million liters of wastewater per day before releasing it into waterways; and
• additional new desludging trucks and construction of the Pinugay Septage Treatment Plant to ensure continued sanitation services for residents of Baras, Pililla, Tanay, and Jala-jala in Rizal.

The project intends to reduce pollution produced in Sewerage System operations and to develop climate-resilient infrastructure. With the combined project cost of PHP10.2 billion (US$186.5 million), the two sewerage systems will serve around 129,000 residents by 2046.