Do you know the quality of your water? If you are connected to the municipal water supply, there are reports available that will let you know the state of your water, but if you are not, it will require a test to find this out.
Even water in nature has pollutants in it to some degree, and the methods used to clean our tap water will add chemicals to it.
A low concentration of these substances is harmless, but might affect the flavor of the water.
There are standards for the most common contaminants, and how much is allowed in drinking water. The Environmental Protection Agency (EPA) can provide information on these levels, as well as the dangers that these contaminants pose.
There are those that need to give extra care to the water they drink, especially those with serious illnesses or young children.
If you get your water from a private well, there are no federal regulations in place for the quality of your water, but it is in your best interest to make sure that it does not pose a health risk.