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APPENDIX C3

NATIONAL WATER QUALITY STANDARDS FOR MALAYSIA.

Classes

Parameters Units I IIA IIB III IV V

Ammoniacal-N. mg/l 0.1 0.3 0.3 0.9 2.7 2.7

BOD mg/l 1 3 3 6 12 12

COD mg/l 10 25 25 50 100 100

DO mg/l 7 5-7 5-7 3-5 3 1 pH 6.5-8.5 6-9 6-9 5-9 5-9 -

Colour TCU 15 150 150 - - -

Elec. Cond µmhos/cm

1000 1000 - - 6000 -

Floatables N N N - - -

Odour N N N - - -

Salinity* % 0.5 1 - - 2 -

Taste N N N - - -

Tot. Diss. Sol.* mg/l 500 1000 - - 4000 -

Tot. Susp. Sol. mg/l 25 50 50 150 300 300

Temperature ºC - Normal ±2 - Normal ±2 - -

Turbidity NTU 5 50 50 - - -

F. Coliform** counts/1

00ml

10 100 400 5000

(20000)εε 

5000

(20000)ε 

Total Coliform counts/1

00ml

100 5000 5000 5000 5000 5000

A1 mg/l ENL - - (0.06) 0.5 -

As mg/l ENL 0.05 0.4 (0.05) 0.1 >IV

Ba mg/l ENL 1 - - - >IV

Cd mg/l ENL 0.01 0.01* (0.001) 0.01 >IV

Cr(IV) mg/l ENL 0.05 1.4 (0.05) 0.1 >IV

Cr(III) mg/l ENL - 2.5 - - >IV

Cu mg/l ENL 1 - - 0.2 >IV

Hardness mg/l ENL 250 - - - >IV

Ca mg/l ENL - - - - >IV

Mg mg/l ENL - - - - >IV

 Na mg/l ENL - - - 3 SAR >IV

K mg/l ENL - - - - >IV

Fe mg/l ENL 0.3 1 - 1(leaf)

5(others)

>IV

Pb mg/l ENL 0.05 0.02* (0.01) 5 >IV

Mn mg/l ENL 0.1 0.1 - 0.2 >IV

Hg mg/l ENL 0.001 0.004 (0.0001) 0.002 >IV

 Ni mg/l ENL 0.05 0.9* - 0.2 >IV

Se mg/l ENL 0.01 0.25 (0.04) 0.02 >IV

Ag mg/l ENL 0.05 0.0002 - - >IV

Sn mg/l ENL NR 0.004 - - >IV

U mg/l ENL NR - - - >IV

Zn mg/l ENL 5 0.4* - 2 >IV

B mg/l ENL 1 - (3.4) 0.8 >IV

Cl mg/l ENL 200 - - 80 >IVCl2  mg/l ENL - - (0.02) - >IV

CN mg/l ENL 0.02 0.06 (0.02) - >IV

F mg/l ENL 1.5 10 - 1 >IV

 NO2  mg/l ENL 0.4 0.4 (0.03) 5 >IV

 NO3  mg/l ENL 7 - - -

P mg/l ENL 0.2 0.1 - - >IV

Silica mg/l ENL 50 - - - >IV

SO4  mg/l ENL 250 - - - >IV

S mg/l ENL 0.05 - (0.001) - >IV

CO2  mg/l ENL - - - - >IV

Gross-α  Bq/l ENL 0.1 - - - >IV

Gross-β  Bq/l ENL 1 - - - >IV

Ra-226 Bq/l ENL IV

Sr-90 Bq/l ENL IVCCE µg/l ENL 500 - - - >IV

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APPENDIX C3

Classes

Parameters Units I IIA IIB III IV V

MBAS/BAS µg/l ENL 500 5000 (200) - -

O & G (mineral) µg/l ENL 40;NF N - - -

O & G(emulsifiededible)

µg/l ENL 7000;N N - - -

PCB mg/l ENL 0.1 6 (0.05) - -

Phenol µg/l AB 10 - - - -

Aldrin / Dieldrin µg/l AB 0.2 0.2 (0.01) - -

BHC µg/l AB 2 9 (0.1) - -

Chlordane µg/l AB 0.08 2 (0.02) - -

t-DDT µg/l AB 0.1 1 (0.01) - -

Endosulfan µg/l AB 10 - - - -

Heptachlor /

Epoxideµg/l AB 0.05 0.9 (0.06) - -

Lindane µg/l AB 2 3 (0.04) - -

2,4-D µg/l AB 70 450 - - -

2,4,5-T µg/l AB 10 160 - - -

2,4,5-TP µg/l AB 4 850 - - -

Paraquat µg/l AB 10 1800 - - -

 N = Free from floatable materials/debris or No objectionable odour, or No objectionable taste.

* = Related parameters, only one recommended for use

** = Geometric mean

ε =  Maximum not to be exceeded

AB = Absent

ENL = Expected Natural Level

@ = Maximum (unbracketed) and 24-hr average (bracketed) concentrations

CLASS USES

I Conservation of natural environment

Water supply I – practically no treatment necessary (except by disinfection or boiling only)

Fishery I – very sensitive aquatic species

IIA Water supply II – conventional treatment required

Fishery II – sensitive aquatic species

IIB Recreational use with body contact.

III Water supply III – extensive treatment required

Fishery III – common, of economic value, and tolerant species.

IV Irrigation

V None of the above.

Source: Environmental Impact Assessment Guidelines for Forestry. Department of Environment. October 1998.