Over 300,000 West Virginians were left without water last week after a chemical used in coal processing contaminated their drinking water. Though residents (except for pregnant women) have been given the all-clear that the water is now safe to drink, water pollution remains an all too common problem in many American communities. If there's something off, follow this guide to see what contaminants could be polluting your water. If you suspect something's wrong, contact your local water utility.
Infographic by Alissa Scheller for the Huffington Post