Copper is not harmful to your health, but it can be unsightly. If you are concerned about the copper in your water, you can have it tested by a water quality testing laboratory. You can also use a water filter to remove copper from your water.
What is in your water that stains sink blue-green?
Copper. Copper is a metal that is found in many water supplies. When copper comes into contact with oxygen, it oxidizes and turns a blue-green color. This is why you may see blue-green stains in your sink or on your shower head.