A third of our drinking water comes from groundwater, which is the same as most bottled water. To access this natural source we have a host of sandstone aquifers across the West Midlands and Nottingham. These are supplemented by smaller limestone aquifers in the Cotswolds and Derbyshire area. It’s here that boreholes are drilled hundreds of metres into the ground to reach the naturally filtered groundwater. Unsurprisingly, after countless years of being slowly filtered through rock layers, pumped groundwater generally needs little treatment once it’s been pumped to the surface.