So what's the best way to ensure you're drinking the healthiest water possible?
It all starts with your source
Most contaminants, like chromium-6, hit the water supply as waste products from manufacturing or agriculture, which is why some areas may have more contaminated water than others. Flint, for example, had decade upon decade of auto-industry sludge leaking into its river -- and that doesn't even account for the old pipes transporting it to residents' faucets!
"One of the most important ways to get the cleanest tap water is to ensure that the source water, upstream from the water utility, is not being contaminated by agricultural waste, industrial pollution, or human activity," says David Andrews, PhD and EWG senior scientist.
It's important to stay on top of your city's contamination levels, and which chemicals and other toxicants you have to worry about -- you can do this by calling up your local water authority (it IS public information, after all, as long as you're prepared to wait for typical bureaucratic delays), or you can check out the results of the EWG's independent testing.