What Causes Green Corrosion on Copper Pipes?

Copper pipes have been used in the plumbing industry for years, mainly due to their durability and resistance to corrosion. So, it can be more than unsettling to see a green or greenish-blue substance, almost powdery, begin to form on the piping and plumbing fittings. Also known as verdigris, this type of corrosion is quite common and isn't necessarily cause for alarm. It's just how copper reacts in specific environments, taking on what can best be described as a "patina" hue.  

What's happening is oxidation, which occurs when copper is exposed to water and oxygen for long periods. Humid conditions can lead to pipe corrosion, as the air contains much water vapor. And when that humidity is paired with high temperatures, which it usually is, this can accelerate the copper oxide process, as the heat speeds up the chemical reaction. It can also increase the severity of pipe corrosion and damage your plumbing system. 

Dealing with Pipe Corrosion

The steps for dealing with this type of pipe corrosion will depend mainly on its severity. Slight discoloration in only a few spots can often be remedied by removing the oxidation to prevent the corrosive activity from getting more severe.

Using a light abrasive scrub can help. Another removal method is mixing equal parts salt, white vinegar, baking soda, and flour and then applying the solution to the affected areas. Just remember to return 30 minutes later to scrub away the solution with warm, soapy water — and dry the area thoroughly, too. 

If, however, the corrosion is severe, it could indicate a problem. Perhaps the pipe has a pinhole leak, causing excessive moisture around the affected area. In this instance, it's often best to contact a professional. If you do not re-pipe the affected area, you might need to replace the piping or fittings. 

The reason for this is the integrity of your home's plumbing system. A problem in a pipe can quickly worsen, especially with corrosive materials. With time, that corrosion can cause the affected pipe to burst. So, addressing the issue sooner rather than later is essential to avoid costly repairs. 

Taking Care of Household Pipes



As with anything in the home, pipes require regular maintenance. Leave them unattended for too long, and you could need to replace the plumbing system. To prevent that from happening, let's go over a few of the best practices for pipe care and maintenance:

• Clean the pipes

Cleaning pipe corrosion is the first step. As soon as you see it, remove the corrosive substance with an abrasive scrub, homemade mixture, or acetone. Ensure you ventilate the area with acetone and wipe it down with warm, soapy water. It is also wise to wear gloves and protective eyewear. And while you're at it, take the time to remove any debris from sewer pipes. Frequent clogs can be just as problematic as corrosion, and you may need to bring in a professional who provides pipe cleaning and jetting services. 

• Check for leaks

One thing that should be on every homeowner's to-do list is checking pipes for leaks. You don't need to do this every week, but it should be done regularly. Signs of corrosion, especially when severe, should be reason enough to bring in a professional to prevent a serious problem from forming. 

• Insulate pipes

Anyone living where winters bring cold weather should consider insulating their pipes. The cost is minimal; you can easily find foam pipe insulation at any hardware or home improvement store. Then, it's just a matter of slipping the tube over the pipe to protect it from freezing and bursting. 

• Schedule regular inspections

While this may sound overly cautious, having a professional come in to conduct regular inspections of your water lines can be money well spent. As the saying goes, an ounce of prevention is worth a pound of cure. Even the smallest of leaks can lead to severe damage to the plumbing system and the home. 

If you notice any pipe corrosion, contacting a professional is never a bad idea. The Superior Plumbing and Pipe Lining team is here to help with various services. Contact us today for professional assistance with your plumbing needs.