Water Storage Tanks

It is the responsibility of all management corporations and building owners to ensure the proper maintenance and security of

their water service installations, including water storage tanks, to ensure that water conveyed through them is fit and safe for

drinking at all times. The maintenance and security requirements of water storage tanks are stipulated in the Public Utilities

(Water Supply) Regulations and the Singapore Standard SS CP48 – Code of Practice for Water Services.

Inspection and certification of water storage tanks

Potable water storage tanks which are not properly maintained can be a potential source of contamination. Under the Public

Utilities (Water Supply) Regulations and Singapore Standard SS CP48 – Code of Practice for Water Services, any person

responsible for the maintenance of any part of a water service installation having a water storage tank shall engage, at least

once every 12 months, a licensed water service plumber to inspect, and where necessary to clean and disinfect, and certify the

water storage tank. This is to ensure that:

the water storage tank is fit and safe for the storage of water for human consumption;1.

the water contained in the water storage tank is free from contamination or pollution and that there is no likelihood of

such contamination or pollution;

2.

water samples taken from the water storage tanks pass the appropriate chemical and bacteriological examinations;3.

the water storage tank is properly maintained; and4.

there is no leakage and no likelihood of leakage in the water service installation, including the water storage tank.5.

Water samples taken from the water storage tanks shall be sent to a Singapore Accreditation Council-SINGLAS accredited

laboratory for testing of potable water quality to pass the appropriate chemical and bacteriological examinations. Only

satisfactory test reports from laboratories accredited by Singapore Accreditation Council-SINGLAS will be accepted. The

minimum parameters to be tested and the corresponding typical values they must comply with are shown in table below.

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

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Procedure for inspection, cleaning and sterilisation of water storage

Download

Notification of Water Service Work by Licensed Plumber Form

Download

Certificate of Satisfactory Completion of Water Service Works by Licensed Plumber

Download

Inspection and Certification of Water Storage Tank by Licensed Plumber Form

Download

Circulars

Circular to Town Councils, MCSTs & Building Owners (25 May 15)

Download

Circular to Town Councils/MCSTs/Building Owners (4 Nov 11)

Download

Circular to relevant government agencies, statutory boards, Professional Engineers, M & E Consultants, Associations and

Organisations (6 Sep 11)

Download

Circular to Town Councils, MCSTs & Building Owners (27 Jun 11)

Download

Completed forms shall be submitted to the address shown below.

If you have any enquiries or feedback, please contact us at:

Inspectorate Branch

Water Supply (Network) Department

PUB, the national water agency

40 Scotts Road #10-01

Singapore 228231

Telephone : 68852443 / 68852444 / 65172935 / 8852446 / 67313912

Facsimile : 68852442

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