Water Sampling

Water samples taken from tanks shall be sent to a SAC-SINGLAS (Singapore Accreditation Council-Singapore Laboratory Accreditation Scheme) accredited laboratory for physical & chemical analysis and bacteriological examinations. Parameters are well within the Guidelines for Drinking-Water Quality set by the World Health Organisation (WHO). A test report from the accredited laboratory will be provided upon satisfactory results.


Table: Minimum parameters to be tested and the typical values for compliance
as stipulated by NEA (National Environment Agency)


Physical, Chemical & Bacteriological Characteristics

Typical Water Quality Values to be complied with

Physical Analysis Parameters

Colour (Hazen Unit)


Turbidity (NTU)


pH Value

7.0 – 9.0

Conductivity (umhos/cm)

80 – 550

Chemical Analysis Parameters

Residual Chlorine (as mg/l CL2)


Iron (as mg/l Fe)


Bacteriological Characteristics

Total Colony Count (cfu/ml, 35oC, 48 hrs)


E.Coli (cfu/100ml, 35oC, 24 hrs)