What exactly is copper? 

This natural element occurs in rock, water, soil, plants, sediment, and air.  In small amounts, copper is essential for living organisms.  But too much copper can cause nausea and vomiting and long term exposure can cause liver and kidney damage.  It is recommend by the US Department of Agriculture (USDA) that we intake 1.0 -1.6 mg per day.

But if you’d like to keep it out of your drinking water, reverse osmosis is ideal.