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Unfiltered fervour: The rush to get off the water grid

Startups such as Live Water in Oregon and Tourmaline Spring in Maine have emerged in the last few years to deliver untreated water on demand as awareness increases

Above: Mr Singh believes public water is poisoned and has started selling spring water.

Above: A use-by date on the cap of a bottle of unfiltered, untreated and unsterilised spring water.

San Francisco

AT Rainbow Grocery, a cooperative in this city's Mission District, one brand of water is so popular that it's often out of stock. But one recent evening, there was a glittering rack of it: glass orbs containing 2.5 gallons of what is billed as "raw water" - unfiltered,...