How should a water tank in a landed home be maintained?

Water tank cleaning: who is responsible

If you own a landed house and your water passes through your own storage tank after the sub-meter, that tank is yours to look after. PUB's page on water storage tanks says the mandatory yearly certification does not apply to these homes, but the owner must still engage a PUB Licensed Plumber to clean and maintain the tank regularly. If you rent, raise it with the landlord.

Flats and condos work differently. In an HDB block, the water tank is common property, like the corridors, void decks and lifts, and HDB explains that the Town Council controls, manages and maintains it. For condos, PUB places the duty on the Management Corporation Strata Title (MCST) or building owner to maintain and secure the tanks so the water stays fit to drink. Someone in a Punggol block or a Bukit Timah condo who sees brown water at every tap should contact the Town Council or managing agent first.

For other questions about running a house, see the landed homes FAQ.

Landed house water tank: the rules

PUB's tank requirements sit in the Public Utilities (Water Supply) Regulations and SS 636, the Code of Practice for Water Services, according to its water storage tanks page. For a building with a tank, whoever maintains it must engage a PUB Licensed Plumber at least once every 12 months to inspect, clean and disinfect where needed, and certify the tank. Late certification is an offence. Certification confirms the tank is fit for storing drinking water, the water is free from contamination, samples pass chemical and bacteriological tests at an accredited lab, and there is no leak.

Beyond tanks, PUB's plumbing works rules require regulated water service and sanitary plumbing works to be done by PUB Licensed Plumbers, apart from simple jobs such as installing or replacing a washbasin or sink and its bottle trap, which a handyman may do. Since 2018, engaging a plumber not licensed by PUB for regulated works has been an offence. Our guide on what needs a licensed plumber maps out the rest.

Signs a tank needs attention

A tank tucked on the roof or above the kitchen is easy to forget until the taps tell you something. Watch for:

• Yellow, brown or cloudy water from several taps at once.
• Grit, flakes or slimy bits caught in tap aerators and shower heads.
• A stale, earthy or musty smell from the cold taps.
• Water running from the overflow pipe, or a damp stain on the ceiling below the tank.
• A cover that is cracked, loose or missing, which leaves the water open to dirt and insects.

If only one tap misbehaves, the problem may lie in that tap or its pipe rather than the tank. Our guide to discoloured tap water helps you narrow it down before you call anyone.

What a tank clean involves

Each plumber has their own method, but a home tank clean generally covers the same ground:

• Shutting the inlet and draining the tank, with the household told how long the water will be off.
• Removing sludge and sediment from the tank floor.
• Scrubbing the inside walls and fittings.
• Disinfecting, then flushing the tank so no disinfectant is left before it refills.
• Checking the cover, the overflow pipe and the inlet valve, and looking for leaks.

Do not pour household products into the tank between visits. Never mix bleach with acid-based cleaners or ammonia.

Good water tank maintenance in Singapore homes also means keeping a simple record: when each clean happened, who did it and what they flagged. When you contact a licensed plumber, ask how long the water will be off, whether before-and-after photos are included and what the job covers. Quotes depend on the tank's size, access and condition.

Drinking water and your tank

Many households drink straight from the tap, and our post on is tap water safe to drink looks at the public supply. A tank adds a stage that is in your hands: water can sit there for hours before it reaches your glass.

That is why PUB frames tank care around keeping water fit to drink, and asks landed owners with a tank after the sub-meter to have a PUB Licensed Plumber clean and maintain it regularly. If your water tastes or smells unusual, switch to bottled water for drinking until the tank has been checked.

Fitting tank care into the year

Tank care is easiest when it has a fixed place in your calendar instead of waiting for brown water. Agree a cleaning schedule with your plumber based on what they find, and pair it with other jobs at the same height, such as gutter and roof checks, so one ladder session covers several items.

A clean also makes sense after anything that disturbs the supply, such as plumbing works or a long overseas trip that leaves water standing. Our landed home maintenance checklist helps you place tank care alongside the other recurring jobs a house needs.

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