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) |
<5 |
| Turbidity (NTU) |
<5 |
| pH Value |
7.0 – 9.0 |
| Conductivity (umhos/cm) |
80 – 550 |
|
Chemical Analysis Parameters |
|
| Residual Chlorine (as mg/l CL2) |
<2.0 |
| Iron (as mg/l Fe) |
<0.04 |
|
Bacteriological Characteristics |
|
| Total Colony Count (cfu/ml, 35oC, 48 hrs) |
<500 |
| E.Coli (cfu/100ml, 35oC, 24 hrs) |
<1 |