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River Quality Monitoring

Figure 3.Map showing the selected river system draining into Manila Bay

Selected river systems in the Manila Bay Region (Region 4-A, NCR and Region 3) discharging into Manila Bay were monitored to determine their compliance with the water quality criteria. Figure 3 shows the location of selected river system monitored.

In the NCR, three (3) river system such as Parañaque, Navotas-Malabon-Tullahan-Tenejeros and Meycauayan-Valenzuela rivers system were assessed. In Region 3, nine (9) river system were monitored such as Guagua, Talisay, Angat, Sta. Maria, Obando, Marilao, Bocaue, Meycauayan and Pampanga River. Likewise assessed are the 4 rivers system in R4A namely Imus, Cañas, Ylang – ylang and Rio Grande Rivers.

Based on the monthly assessment of DO and BOD levels in the river system of NCR, R3 and R4A, Tables 6 – 11 indicated the number of stations that passed the DO criteria of 5 mg/L and BOD criteria of 7 (10) mg/L for class C waters.

Table 5 – Number of Stations that Passed the DO Criteria from 2011 – 2015 for NCR

RIVERS MONITORED Number of Stations Monitored 2011 2012 2013 2014 2015
Parañaque River 10 All stations failed All stations failed All stations failed All stations failed All stations failed
Navotas-Malabon-Tullahan-Tenejeros 9 1 station passed All stations failed All stations failed All stations failed All stations failed
Meycauayan-Valenzuela River 6 3 stations passed All stations failed All stations failed All stations failed All stations failed
Total 25

 

Table 6 – Number of Stations that Passed the DO Criteria from 2011 – 2015 for Region III

RIVERS MONITORED Number of Stations Monitored 2011 2012 2013 2014 2015
Guagua River 3 All stations failed 3 stations passed All stations passed All stations failed All stations failed
Talisay River 3 All stations passed 1 station passed All stations passed All stations failed All stations failed
Angat River 4 1 station passed 2 stations passed 1 station passed All stations failed All stations failed
Sta. Maria River 3 All stations failed All stations failed All stations failed All stations failed All stations failed
Obando River 3 2 stations passed All stations failed All stations failed All stations failed All stations failed
Marilao River 5 All stations failed All stations failed All stations failed All stations failed All stations failed
Bocaue River 3 All stations failed All stations failed All stations failed All stations failed All stations failed
Meycauayan River 5 All stations failed All stations failed All stations failed All stations failed All stations failed
Pampanga River 5 All stations failed All stations failed All stations failed All stations failed All stations failed
Total 34

 

Table 7 – Number of Stations that Passed the DO Criteria from 2011 – 2015 for Region IV – A

RIVERS MONITORED Number of Stations Monitored 2011 2012 2013 2014 2015
Imus River 8 4 stations passed 4 stations passed All stations passed 7 stations passed 5 stations passed
Cañas River 6 All stations passed All stations passed All stations passed 5 stations passed 4 stations passed
Ylang-ylang River 5 4 stations passed 4 stations passed All stations passed 4 stations passed 3 stations passed
Rio Grande River 5 – All stations passed All stations passed 4 stations passed 2 stations passed
Total 24

 

Table 8 – Number of Stations that Passed the BOD Criteria from 2011 – 2015 for NCR

RIVERS MONITORED Number of Stations Monitored 2011 2012 2013 2014 2015
Parañaque River 10 All stations failed All stations failed All stations failed All stations failed All stations failed
Navotas-Malabon-Tullahan-Tenejeros 9 All stations failed All stations failed All stations failed All stations failed All stations failed
Meycauayan-Valenzuela River 6 All stations failed All stations failed All stations failed All stations failed All stations failed
Total 25

 

Table 9 – Number of Stations that Passed the BOD Criteria from 2011 – 2015 for Region III

RIVERS MONITORED Number of Stations Monitored 2011 2012 2013 2014 2015
Guagua River 3 All stations failed 3 stations passed 2 stations passed All stations failed All stations failed
Talisay River 3 All stations passed All stations passed All stations passed All stations passed All stations failed
Angat River 4 All stations passed All stations passed All stations passed All stations passed All stations failed
Sta. Maria River 3 1 station passed All stations passed All stations passed All stations passed All stations failed
Obando River 3 All stations failed All stations passed 2 stations passed All stations failed All stations failed
Marilao River 5 All stations failed All stations failed All stations passed All stations failed All stations failed
Bocaue River 3 All stations passed All stations passed All stations passed All stations failed All stations failed
Meycauayan River 5 All stations failed All stations failed All stations failed All stations failed All stations passed
Pampanga River 5 All stations passed All stations passed All stations failed All stations passed –
Total 34

 

Table 10 – Number of Stations that Passed the BOD Criteria from 2011 – 2015 for Region IV – A

RIVERS MONITORED Number of Stations Monitored 2011 2012 2013 2014 2015
Imus River 8 1 station passed 5 stations passed All stations passed 5 stations passed 7 stations passed
Cañas River 6 All stations passed All stations passed All stations passed All stations passed All stations passed
Ylang-ylang River 5 4 stations passed 4 stations passed 1 station passed 4 stations passed 4 stations passed
Rio Grande River 5 – All stations passed All stations passed All stations passed 4 stations passed
Total 24