If you drink tap water out of a filtered pitcher, it is important to make sure you're using the right type of filter depending on your local contaminants, which in some cases, might be more serious than others.

USA TODAY published a map of public drinking water systems that recently submitted test results for "forever chemicals" to the Environmental Protection Agency. Some Virginia towns were found to have chemicals over the federally dictated levels.

Here's what we know.

What are 'forever chemicals'?

PFAS, also known as "forever chemicals," are defined by the EPA as long-lasting chemicals with components that break down very slowly over time.

Because of the widespread use of these chemicals, they are found in water, air, soil, fish and even human blood in varying levels. Scie

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