It can be nearly impossible to tell from just taste and smell if the water coming out of your tap is safe to drink. The good news is, if your home uses public or municipal water lines, your water provider can give test results for the water for free. Just look up the number on your water bill and call them up. Public water must be tested on a regular basis, and the company must offer customers something called a Consumer Confidence Report, which details the results of the testing. Many of these reports can also be found on the Environmental Protection Agency's website, epa.gov.