The green color is copper oxide, which is a form of corrosion on the copper pipe, but unlike iron oxide (rust), it will not eat through the pipe and cause a leak. The green spots are likely caused by moisture in the air of your basement condensing on the surface of the pipe.

How do I get rid of the green on my copper pipe?

Wipe the pipe with a rag to dry the area and remove condensation.
Rub an emery cloth over the discoloration to remove the green coloring and reveal shiny copper. ...
Wet a rag with acetone. ...

 
Heat any persistent green sections with the flame from a propane torch.

 

 

 

 

 

 

  

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