Why do I have Green Stains on My Fixtures?

When Water sits unused overnight, copper deposits that have dissolved in your home’s copper plumbing system may cause a green or blue-green stain on kitchen or bathroom fixtures.  Copper stains may be the result of a leaky faucet or a faulty toilet flush valve, so be sure your plumbing is in good working order.

Copper stains may also be caused by overly hot tap water.  Generally speaking you should maintain your water temperature at a maximum of 120 degrees Fahrenheit.  You should consult the owner’s manual for your hot water heater or check with your plumber to determine your current heat setting.  Lowering your water temperature will reduce the staining problem and save you money on your energy bill.

Also keep in mind that a frequently used tap usually will not produce copper stains, so if you flush the tap for a minute or so before using the water for cooking or drinking, copper levels will be reduced.