Is your tank in good condition?

Traditionally tanks were made of galvanised iron and these will rust over time resulting in rust
particles and iron dissolving into the water. This can lead to ‘bits’ in your water or the water
having a brown or yellowish tinge. It can also give the water a metallic taste.
Nowadays, tanks are constructed of plastic (polyethylene) and are unlikely to cause problems
provided that they are designed for drinking water purposes and have a closely fitting cover.
Look for one with the WRAS Approved Product logo which ensures the materials used have
been tested in accordance with the Regulations to ensure they do not transfer a taste or odour
to the water or promote the growth of bacteria.

For more information on approved materials see: Domestic Plumbing Tips, page 13.

Is the tank covered?

Ensure your tank has a close-fitting lid of a suitable material that will not deteriorate or allow
mould or bacteria to grow on it and drip into the water. The lid must prevent debris falling in and
polluting the water supply. It is not uncommon for birds, rodents or insects to find their way into
tanks that are uncovered or only partially covered. This can cause anything from particles in
the water, to unusual tastes and odours and can make you ill. Any vents or openings should be
screened with fine mesh for the same reason.

Your tank should also be insulated along with the pipes in the roof space to avoid freezing and
bursting in the winter and warming of the stored water during summer, when the roof space can
get very hot. Do not insulate underneath the storage tank as the heat rising from the room below
will help prevent the water freezing.

The tank should have an overflow pipe to divert any excess water safely out of the property,
otherwise it would overflow into the roof space and flood your home.
If you notice water coming out of the overflow (or ‘warning’ pipe) it means your tank is filling
too much. This probably means the ball valve in the tank needs repairing or replacing and you
should contact a professionally qualified plumber straight away.

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