Normally tap water and prescription drugs do not go hand in hand, but in some cities a study found that traces of prescription drugs were in the drinking water. This is a problem that Columbia doesn't have to worry about due to the source of its water.

"We are pretty lucky here because our water comes from ground water from wells rather than directly from the water from the rivers," said water treatment supervisor Barry Kirchhoff.

Prescription drugs are often flushed into rivers, which can cause possible contamination.

"Fifteen years ago when I graduated from pharmacy school they actually advised you to flush them down the toilet," said pharmacist Bill Morrissey.

There are ways to keep Columbia's water quality high. Never flush prescription drugs down the toilet or dispose of them in down a kitchen sink. Also, dispose of all pharmaceutical products that aren't necessary anymore.