Interactive Map 1. Map showing the selected river system darining into the Manila Bay
At National Capital Region (NCR), there are three (3) river systems (Parañaque, Navotas - Malabon - Tullahan - Tenejeros and Meycauayan - Valenzuela River), fourteen (14) at Region III, and four (4) (Imus, Cañas, Ylang-ylang and Rio Grande Rivers) at Region IV-A. All river systems were already assessed and are being monitored.
|Rivers Monitored||#Stations Monitored|
|Sta. Maria River||3|
|San Miguel River||3|
The rivers at NCR and Region III has poor water quality results. Low Dissolved Oxygen level is the result of untreated domestic and industrial waste being discharged to the river. In Metro Manila, only 18% of the population are connected to sewerage system while the remaining population relies on septic tanks inappropriately designed, thus contributing high population load in the waterways.