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National Water Quality Standards For Malaysia CLASS PARAMETER UNIT I IIA/IIB III# IV
Al As Ba Cd Cr (IV) Cr (III) Cu Hardness Ca Mg Na K Fe
mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l
‒ 0.05 1 0.01 0.05 ‒ 0.02 250 ‒ ‒ ‒ ‒ 1
(0.06) 0.4 (0.05) ‒ 0.01* (0.001) 1.4 (0.05) 2.5 ‒ ‒ ‒ ‒ ‒ ‒ 1
Pd Mn Hg Ni Se Ag Sn U Zn B Cl Cl2 CN F
mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l
0.05 0.1 0.001 0.05 0.01 0.05 ‒ ‒ 5 1 200 ‒ 0.02 1.5
0.02* (0.01) 0.1 0.004 (0.0001) 0.9* 0.25 (0.04) 0.0002 0.004 ‒ 0.4* (3.4) ‒ (0.02) 0.06 (0.02) 10
0.5 0.1 ‒ 0.01 0.1 ‒ ‒ ‒ ‒ ‒ 3 SAR ‒ 1 (Leaf) 5 (Others) 5 0.2 0.002 0.2 0.02 ‒ ‒ ‒ 2 0.8 80 ‒ ‒ 1
V
NO2 mg/l 0.4 0.4 (0.03) NO3 mg/l 7 ‒ P mg/l 0.2 0.1 Silica mg/l 50 ‒ SO4 mg/l 250 ‒ S mg/l 0.05 (0.001) CO2 mg/l ‒ ‒ Gross‒α Bg/l 0.01 ‒ Gross‒β Bg/l 1 ‒ Ra‒226 Bg/l < 0.1 ‒ Sr‒90 Bg/l < 1 ‒ CCE µg/l 500 ‒ MBAS/BAS µg/l 500 5000 (200) O&G (Mineral) µg/l 40 ; N N O&G (Emulsified µg/l 7000 ; N N Edible) PCB µg/l 0.1 6 (0.05) Phenol µg/l 10 ‒ Aldrin/Dieldrin µg/l 0.02 0.2 (0.01) BHC µg/l 2 9 (0.1) Chlordane µg/l 0.08 2 (0.02) t‒DDT µg/l 0.1 (1) Endoslufan µg/l 10 ‒ Heptachlor/Epoxide µg/l 0.05 0.9 (0.06) Lindane µg/l 2 3 (0.4) 2,4‒D µg/l 70 450 2,4,5‒T µg/l 10 160 2,4,5‒TP µg/l 4 850 Paraquat µg/l 10 1800 Notes * = At hardness 50 mg/l CaCO3 # = Maximum (unbracketed) and 24‒hour average (bracketed) concentrations N = Free from visible film sheen, discolouration and deposits
1 5 ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒ ‒
Sourse : EQR2006
National Water Quality Standards For Malaysia CLASS PARAMETER UNIT I IIA IIB III IV
Ammoniacal Nitrogen Biochemical Oxygen Demand Chemical Oxygen Demand Dissolved Oxygen pH
mg/l
0.1
0.3
0.3
0.9
2.7
V > 2.7
mg/l
1
3
3
6
12
> 12
mg/l
10
25
25
50
100
> 100
mg/l ‒
5 ‒ 7 6 ‒ 9
5 ‒ 7 6 ‒ 9
3 ‒ 5 5 ‒ 9
< 3 5 ‒ 9
< 1 ‒
Colour Electrical Conductivity* Floatables Odour Salinity Taste Total Dissolved Solid Total Suspended Solid Temperature
TCU µS/cm
7 6.5 ‒ 8.5 15 1000
150 1000
150 ‒
‒ ‒
‒ 6000
‒ ‒
‒ ‒ % ‒ mg/l
N N 0.5 N 500
N N 1 N 1000
N N ‒ N ‒
‒ ‒ ‒ ‒ ‒
‒ ‒ 2 ‒ 4000
‒ ‒ ‒ ‒ ‒
mg/l
25
50
50
150
300
300
°C
‒
Normal + 2 °C 50 100
‒
Turbidity Faecal Coliform** Total Coliform
NTU 5 count/100 10 ml count/100 100 ml
5000
Normal + ‒ 2 °C 50 ‒ ‒ 400 5000 5000 (20000)a (20000)a 5000 50000 50000
Notes * = At hardness 50 mg/l CaCO3 # = Maximum (unbracketed) and 24‒hour average (bracketed) concentrations N = Free from visible film sheen, discolouration and deposits
DOE Water Quality Index Classification
‒ ‒ ‒ > 50000
Sourse : EQR2006
PARAMETER
UNIT
Ammoniacal Nitrogen Biochemical Oxygen Demand Chemical Oxygen Demand Dissolved Oxygen pH Total Suspenbed Solid Water Quality Index (WQI)
Class I Class IIA Class IIB Class III Class IV Class V
CLASS
CLASS
mg/l mg/l
I < 0.1 < 1
II III IV 0.1 ‒ 0.3 0.3 ‒ 0.9 0.9 ‒ 2.7 1 ‒ 3 3 ‒ 6 6 ‒ 12
V > 2.7 > 12
mg/l
< 10
10 ‒ 25
25 ‒ 50
50 ‒ 100
> 100
mg/l ‒ mg/l ‒
> 7 > 7 < 25 < 92.7
5 ‒ 7 6 ‒ 7 25 ‒ 50 76.5 ‒ 92.7
3 ‒ 5 1 ‒ 3 5 ‒ 6 < 5 50 ‒ 150 150 ‒ 300 51.9 ‒ 31.0 ‒ 76.5 51.9
< 1 > 5 > 300 > 31.0
Water Classes And Uses USES
Conservation of natural environment. Water Supply I ‒ Practically no treatment necessary. Fishery I ‒ Very sensitive aquatic species. Water Supply II ‒ Conventional treatment. Fishery II ‒ Sensitive aquatic species. Recreational use body contact. Water Supply III ‒ Extensive treatment required. Fishery III ‒ Common,of economic value and tolerant species;livestock drinking. Irrigation None of the above.
Sourse : EQR2006
DOE Water Quality Classification Based On Water Quality Index INDEX RANGE SUB INDEX & WATER QUALITY INDEX CLEAN SLIGHTLY POLLUTED POLLUTED
Biochemical Oxygen Demand(BOD) Ammoniacal Nitrogen(NH3‒N) Suspended Solids(SS) Water Quality Index(WQI)
91 ‒ 100 92 ‒ 100 76 ‒ 100 81 ‒ 100
80 ‒ 90 71 ‒ 91 70 ‒ 75 60 ‒ 80
0 ‒ 79 0 ‒ 70 0 ‒ 69 0 ‒ 59
Sourse : EQR2006
WQI FORMJLAAND CALCULATION FORMULA
WQI = (0.22* SlDO) + (0.19*SIBOD) + (0.16*SICOD) + (0.15*SIAN) + (0.16 * SISS) + (0.12 * SipH) where; SIDO = Sublndex DO (% saturtlon) SIBOD = Sublndex BOD SICOD = Sublndex COD SIAN = Sublndex NH3‒N SISS = Sublndex SS SipH = Sublndex pH 0 ≤ WQI ≤ 100
BEST FIT EQUATIONS FOR THE ESTIMATION OF VARIOUS SUBINDEX VALIES Sublndex for DO (In % saturatlon) SIDO = 0 SIDO = 100 SIDO = ‒0.395 + 0.030x2 ‒ 0.00020x3 Sublndex for BOD SIDOD = 100.4 ‒ 4.23x SIDOD = 108* exp(‒0.055x) ‒ 0.1x Sublndex for COD SICOD = ‒1.33x + 99.1 SICOD = 103* exp(‒0.0157x) ‒ 0.04x Sublndex for NH3‒N SIAN = 100.5 ‒ 105x SIAN = 94* exp(‒0.573x) ‒ 5* I x ‒ 2 I SIAN = 0 Sublndex for SS SISS = 97.5* exp(‒0.00676x) + 0.05x SISS = 71* exp(‒0.0061x) + 0.015x SISS = 0 Sublndex for pH SlpH = 17.02 ‒ 17.2x + 5.02x2 SlpH = ‒242 + 95.5x ‒ 6.67x2 SlpH = ‒181 + 82.4x ‒ 6.05x2
for x ≤8 for x ≤92 for 8 < x < 92 for x ≤ 5 for x > 5 for x ≤ 20 for x > 20 for x ≤ 0.3 for 0.3 < x < 4 for x ≥ 4 for x ≤ 100 for 100 < x < 1000 for x ≥ 1000 for x < 5.5 for 5.5 ≤ x < 7 for 7 ≤ x < 8.75
SlpH = 536 ‒ 77.0x + 2.76x2 Note: *means multlply wlth
for x ≥ 8.75
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