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West Zone concessionaire Maynilad Water Services, Inc. (Maynilad) has inaugurated the new Tunasan Water Reclamation Facility (WRF) in Muntinlupa City—its 25th wastewater treatment facility—expanding sewerage coverage in the south and supporting long-term efforts to protect Laguna de Bay.
Located along Buendia Street in Barangay Tunasan, the new WRF can treat up to 20 million liters of used water per day (MLD). Wastewater from Magdaong, Bubogan, and Tunasan Creeks is conveyed through 1.4 kilometers of sewer pipes into the facility, serving around 83,000 customers within the Tunasan catchment area.
The Tunasan WRF uses the Modified Ludzack–Ettinger (MLE) process—a modern biological treatment technology—to reduce pollutants before discharge. The facility complies with stricter effluent quality requirements under Department of Environment and Natural Resources (DENR) DAO 2016-08, as amended by DAO 2021-19, helping protect Laguna de Bay and the surrounding environment.
“Every wastewater facility we build is more than infrastructure—it is a commitment to public health, a step toward cleaner waterways, and an investment in a future where communities can thrive alongside a healthy environment,” said Maynilad President and CEO Ramoncito S. Fernandez. “By expanding sewerage coverage here in Muntinlupa and investing in modern treatment technologies, we help safeguard Laguna de Bay and strengthen responsible wastewater management in the West Zone.”
The project was implemented in coordination with the Metropolitan Waterworks and Sewerage System (MWSS), the DENR, the Laguna Lake Development Authority (LLDA), and the Muntinlupa City Government. Treated wastewater from the Tunasan WRF is discharged into Bubogan Creek.
With the addition of Tunasan WRF, Maynilad now has a total wastewater treatment capacity of 790 MLD, supporting the company’s broader program to accelerate sewerage and sanitation services in Metro Manila and contribute to the rehabilitation of Laguna de Bay.
Maynilad is the largest private water concessionaire in the Philippines in terms of customer base. It is the concessionaire of the Metropolitan Waterworks and Sewerage System (MWSS) for the West Zone of the Greater Manila Area, which is composed of the cities of Manila (certain portions), Quezon City (certain portions), Makati (west of South Super Highway), Caloocan, Pasay, Parañaque, Las Piñas, Muntinlupa, Valenzuela, Navotas and Malabon all in Metro Manila; the cities of Cavite, Bacoor and Imus, and the municipalities of Kawit, Noveleta and Rosario, all in Cavite Province.
