Help & Advice

What is rainwater harvesting?

It is a well-known fact that much of the water we use does not need to be of drinking water quality. Studies have shown that 55% of domestic treated water could be substituted for rainwater.

In simple terms rainwater harvesting systems are designed to capture and store rainwater that falls onto roofs.

It is then passed through a filter to remove leaves and other debris, before being stored in an underground tank.

The water can be used with or without the addition of a header tank for a variety of non-potable water uses including flushing the toilet, washing vehicles and gardening.


Typically rainwater harvesting systems are more suited for new-build properties, where the cost of plumbing them in is negligible. Retrofitting them into an existing property can be expensive because of the amount of internal plumbing work required.


The British Standard for rainwater harvesting, BS8515 provides criteria for rainwater harvesting equipment manufactured in the UK.

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