QUALITY OF TREATED WATER (TYPICAL VALUES), 1995
A) Chemical and Physical Town Choa Chu Kang WHO
Characteristics Water and Bedok Water Guideline
(in mg/l where applicable) Values ('93)
Colour (Hazen Unit) less than 5 less than 5 15
Turbidity (NTU) less than 5 less than 5 5
pH Value 7.0 - 8.5 7.0 - 8.5 -
Conductivity (umhos/cm) 60 - 200 250 - 550 -
Taste Unobjectionable Unobjectionable -
Odour Unobjectionable Unobjectionable -
Nitrate (as NO3) 0.5 - 7.0 0.5 - 7.0 50
Fluoride (as F) 0.5 - 0.7 0.5 - 0.7 1.5
Total Dissolved Solid 50 - 150 200 - 350 1000
Total Alkalinity (as CaCO3) 10 - 30 20 - 50 -
Total Hardness (as CaCO3) 20 - 60 50 - 100 -
Chloride (as Cl) 5 - 20 35 - 100 250
Sulphate (as SO4) 5 - 30 30 - 60 250
Phosphate (as PO4) less than 0.10 less than 0.10 -
Silica (as SiO2) 3 - 12 1 - 10 -
Iron (as Fe) less than 0.04 less than 0.04 0.3
Manganese (as Mn) less than 0.05 less than 0.05 0.5
Copper (as Cu) less than 0.05 less than 0.05 2
Aluminium (as Al) less than 0.10 less than 0.10 0.2
B) Bacteriological
Characteristics
Coliform Organisms/100 ml, less than 1 less than 1 less than 1
(35 deg C, 24 hours)
Source: Water Department, Public Utilities Board, Singapore
(as faxed by PUB to Loh Soon Hin on 30 Nov 96)
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