Why Harvest your Rain?

Llyn Bodgynnydd

Mains water has to be taken from rivers and water tables underground. Taking this water reduces the flow of water in our rivers and dries up wetlands. The result is that rivers and wetlands can not clear themselves of sediments and pollutants and become vulnerable to drought and flooding. When a wetland dries, CO2 is released which then contributes to global warming.

All mains water has to be expensively treated to bring it to drinking water quality standards; and most of it is used to flush the toilet! Saving water by harvesting your rain reduces the amount of chemicals and energy that the water company uses to treat your water and to pump it your tap.

Parc Menai sewage works

It has been estimated by the US EPA that in 2000, 7% of the world's Energy consumption was used treating and transporting water in mains supply systems. Using less mains water will reduce your households carbon footprint.


Harvested rainwater can be directly used for a variety of purposes, flushing the toilet, washing clothes, cleaning cars, watering the garden. With additional treatment rainwater can be used for washing dishes, showers and baths, and drinking. Having your own store of rainwater makes your household independent of the mains water supply and allows you to water your garden when there is a hosepipe ban.

The roofs of our houses are very different from the natural ground surface. When rainfalls on a roof it quickly runs off  and if not collected ends up going down the drain, picking up pollutants and has to be treated at your local sewage works. By collecting rainwater, your household can reduce the volume of storm water going to your local sewage works.

In addition if you can prove that no rainwater from your roof flows in to the sewerage network then your local water company should qualify your household for a £25 / year discount.