A filter is only certified to remove the contaminants that are listed on the box or in the package information . For example, Brita's Standard Model Water Filtration Pitcher is certified to remove copper, lead, and mercury under Standard 53. That may mean that Brita didn't want to pay to have its filter certified for the other contaminants, or that the filter doesn't reduce their levels. For more information. There's no easy answer.
Bottled water comes with many names.
Springs are supposed to be protected from pollution, according to industry guidelines and some state regulations. Sparkling water is spring water that contains carbon dioxide gas. Drinking water is water that has probably been drawn from a municipal system. If the water comes right out of the tap and into the bottle or jug, the label has to disclose which municipality it came from. That's why you won't find any mention on bottles of Pepsico's Aquafina or Coca-Cola's Dasani that both originate from city water supplies.