Calumpang STP - Wastewater Treatment Plant in the Philippines

Calumpang STP is a sewage treatment plant located in the Philippines, serving the metropolitan area of Manila. The plant is operational and plays a key role in managing wastewater from the densely populated region. As part of the country's wastewater infrastructure, it contributes to protecting public health and the environment. The plant operates under the Philippine Clean Water Act (Republic Act 9275), which mandates proper treatment of wastewater before discharge. For plants serving large urban populations, secondary treatment is typically required to reduce organic pollutants and suspended solids. The regulatory framework also includes standards for effluent quality to safeguard receiving waters. The treated effluent from Calumpang STP is discharged into the Pasig River system, which flows into Manila Bay and ultimately the South China Sea. This watershed supports diverse aquatic life and is vital for local fisheries and recreation. Proper treatment helps mitigate pollution impacts on this ecologically important estuary.

Calumpang STP discharges into the Pasig River, which flows through Metro Manila and empties into Manila Bay, a semi-enclosed estuary connected to the South China Sea. The bay supports important fisheries and mangrove ecosystems, but faces pressures from urbanization and industrial activities. Effective wastewater treatment is critical to reducing nutrient loads and protecting water quality in this sensitive coastal environment.