Last Updated: 22 June 2022.
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Water Quality

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There are various ways of stating the river water quality. One way is in the form of classes from Class I to Class v. class I is the best while the Class V is the worst. This water quality class determined based on the water quality index (WQI). It was determined by 6 parameters, namely, pH, DO, BOD, COD, TSS and Ammoniacal Nitrogen.

 

River Water Quality Class Schedule

Class Water Quality Index Use Water
Class I 100.0 92.7 –

Preservation of natural
Very minimal water treatment
Species of marine life that is very sensitive

Class II 76.5 – 92.7

Conventional water treatment
Sensitive marine life species
Suitable for recreation

Class III 51.9 – 76.5

More comprehensive water treatment
Suitable for livestock

Class IV 31.0 – 51.9 Suitable for irrigation
Class V 0.0 – 31.0 Water cannot be utilized

Another way is to declare the river water quality in the form of a category that is clean, slightly polluted and Corrupted which also determined through 6 parameters are the same.

 

Table Of Categories Of River Water Quality

Category Water Quality Index
NET 81 – 100
A Little Contaminated 60 – 80
Corrupted 0 – 59

 

River Water Quality In The State Of Perak (Source: Doe)

Years Bil. Sungai
Monitored
Class Category
    I II III IV V NET A little
Corrupted
Corrupted
2009 52 5 28 19 - - 27 23 2
2008 52 4 31 17 - - 30 21 1
2007 52 3 32 16 1 - 31 19 2
2006 52 1 32 17 2 - 28 19 5
2005 52 2 29 18 3 - 29 14 9
2004 44 - 25 19 - - 21 23 -