My water leaves a blue or green stain in my fixtures. What type of testing should I have?

Copper. This type of staining usually indicates corrosion of copper pipe somewhere in the water system. The Pipe Degradation Package looks for all types of metallic degradation products in water. Look for it under Packages on this web page. Or you can request the copper test individually. Copper can reach very high levels in some types of refrigerated water and icemakers. Excessive copper in humans can cause stomachaches, burning sensation in stomach and mouth, and other types of gastrointestinal problems. Even though copper can make a person very ill, it is not considered a “toxic” metal because it will leave your body when you stop drinking water with high copper level.