The Government should require that all new builds have underground rainwater recovery systems installed. A grant scheme should also be set up. This could be funded by additional taxes on underperforming water companies, to help homeowners to retrofit on existing properties.
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We're going to see more hosepipe bans and water shortages every year due to a range of factors:
Circa 175k new properties being built every year, with the Government plan to increase to 300K
No new reservoirs built in 30 years
Climate change is causing hotter, drier summers