Researchers tested spring, groundwater, and purified bottled waters against local tap to see how treatment shapes the byproducts that emerge — and the differences were striking.

If you live in the District or Northern Virginia, your water might start to smell funny on Monday. That’s because of an annual change to the water purification process — a sort of “spring cleaning” ...

Water – it's a simple concept, yet there are so many different kinds available for purchase. There’s purified water (tap water that’s been stripped of nutrients and may be added back in later), ...