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How to Fix Pinhole Leak in Copper Pipe

How to fix a pinhole leak in copper pipe can be tricky. There are many causes, and you will need to find out what exactly caused the problem. Here are a few common ones: Pitted corrosion, Turbulence, Low pH, and Chlorine. In some cases, there is a definite cause. It may be as simple as a fitting being too close together. If you can’t find it, contact a plumber.

Pitted corrosion

A growing body of research indicates that microbial induced oxidation is a major cause of copper-pitting corrosion. In fact, an SEM analysis of copper water lines found microbes wedged inside the crystallographic planes of corroded copper. These bacteria may actively participate in pitting corrosion, or they may simply use copper oxidation as an energy source. Copper oxidation is usually associated with copper sulfides, but this study suggests that microbial activity could be a major contributor to copper corrosion.

Several water utilities are dealing with the effects of localized pitting corrosion. The extreme attack on copper tubing can cause pinhole leaks, water damage, and mold growth. These problems can be expensive to repair. This study will shed new light on mitigation strategies that could help reduce or even prevent this problem. The authors recommend a combination of ortho and poly-phosphate blends as a potential treatment option. The blend of these two chemicals may be an effective solution for preventing pitting.

When bacteria feed on the sulphates in water, they can produce hydrogen sulphide and sulphuric acid. These sulphate-reducing bacteria do not multiply in bulk water. They require anaerobic conditions under the deposits in order to reproduce. Pseudomonas, which can form bio-films and slimes, can be the culprits in pitted corrosion. The bacteria create tiny pits that coalesce to form larger pits and leaks.


If you are experiencing a pinhole leak in a copper pipe, you may want to consider using a different type of plumbing pipe. Although copper pipes are highly durable, they can also develop a pinhole leak if you install them improperly. The problem is that the turbulence created by the leaking water can cause significant damage to the inner protective lining of the pipe. The solution to this problem is to install copper pipe that is more than eight inches in diameter.

If you are unable to locate the source of the pinhole leak in copper pipe, you can simply inspect the pipes for rust and corrosion. This will reveal any pitting or oxidation on the pipe. This type of corrosion is usually gradual, but can be an indication of an underlying pinhole leak. The good news is that copper pipes do not corrode very quickly. Proper maintenance of copper piping will allow it to last for over 50 years. If you don’t do anything to keep it in good condition, you could be facing a pinhole leak within a few years.

Another common cause of pinhole leaks is turbulence, which occurs when water is traveling at unstable speeds. The minerals in the water supply can erode the inner lining of the pipe, especially if the water is traveling at a fast speed. Fortunately, there are ways to reduce this turbulence. You can also install a water softener to reduce the turbulence caused by your plumbing system. If you aren’t confident in your plumbing skills, call a plumber to inspect your pipes.


If you notice a pinhole leak in your copper pipe, you probably want to replace it as soon as possible. To do this, shut off the water, cut out the corroded section of the pipe, and then join the pipe back together. Unfortunately, copper pipes are rarely easy to reach. In our case, the pinhole leak was located under the concrete slab in our kitchen, and we had to take out the tile and break through the slab to get to the pipe.

Using chloramines has been associated with a large number of pinhole leaks in copper tubing. Although plumbing code states that plumbers must use copper tubing, recent studies have found that chloramine treatment leads to increased copper and lead levels in drinking water. The use of chloramines is not the only cause of the leaks, however. In the past few years, the use of chlorine to treat drinking water has been associated with a dramatic increase in pinhole leaks in copper pipe.

Copper pipes are extremely expensive to replace and require professional plumbing expertise to repair. Chlorine is a corrosive agent and breaks down the copper piping over time. The corrosion begins inside of the pipe, causing a pinhole leak. Copper piping can also be affected by low pH or hard water, which can cause pitting. Low pH water can also cause pinhole leaks and blue and green water staining in showers.

Low pH

Water with a low pH can cause damage to copper pipes. This is because the copper pipes develop internal pitting. When these pits form, the metal inside will be exposed to the elements. Copper piping is especially susceptible to pinhole leaks. A pinhole leak may go undetected if it is hidden behind a wall. Therefore, you should know how to repair it before it causes more damage.

A pinhole leak is often the result of chemical damage. Depending on the water supply in your area, the pH of your home’s water can affect the pipes’ protective coating. Without this coating, pipes are prone to leaks and corrosion. Here are some tips on how to fix a pinhole leak:

Low pH water corrodes copper, but high pH water protects the pipes. It can also lead to expensive headaches if the leaks are not treated. For instance, pH levels in water can be adjusted using reputable labs. For those who suspect low pH in their water, plumbers can use various water treatment methods to raise it. Some of these include adding potassium carbonate or a neutralizer.

Turbulence causes pinhole leaks

When there is water turbulence inside a copper pipe, pinhole leaks appear. These aren’t always visible. In some cases, these pinholes are caused by a combination of different causes. Corrosion, excessive flux, or exposure to sunlight and water can also accelerate the deterioration of copper. If left untreated, these problems may cause water damage in the form of mold growth or other contaminants.

To prevent pinhole leaks, make sure your copper pipes have the proper sizing. Water pressure needs to be between 40 and 80 PSI to prevent the inner lining from deteriorating. Make sure to use the proper pipe size and pipe fittings. Copper pipes can become damaged faster if you use hard water, so be sure to install a water filtration system to remove dissolved minerals. Another cause of pinhole leaks is fittings that are placed too close together.

Poor fitting spacing can lead to turbulence. Fittings should be at least five pipe diameters apart. Make sure to follow plumbing codes and have them checked annually. If hard water is a problem, consider installing a water softener. Hard water can cause internal corrosion and premature leaks. Water softeners help remove minerals from water and prevent oxidation. To prevent the occurrence of a pinhole leak, be sure to check the plumbing system annually.

Repair clamps

Using repair clamps to fix a pinhole leak in copper pipe is a relatively easy DIY project. To begin, drain the water system and shut off the main valve. Next, remove any dried gunk or corrosion from the pipe with a putty knife. If you’re doing the job yourself, you can use a cloth soaked in warm water to clean the pipe. Then, slide the clamp over the pipe. The clamp’s rubber gasket should be centered over the pinhole. Lastly, screw the clamp into place. Be sure not to overtighten the clamp, though, as it can damage the pipe and cause a break or larger leak.

A repair clamp cannot create a seal if the pipe is dirty. To begin, remove any debris, and then clean the pipe with a dry rag. If the buildup is stubborn, try using an abrasive solution to remove it. Remember that this is a temporary fix, so dry the pipe thoroughly after cleaning. If the leak is due to a leak in a nearby water pipe, wait at least 20 to 30 minutes before attempting to use a repair clamp to fix the pipe.

Epoxy putty

If you have a pinhole leak in your copper pipe, you may want to try using epoxy putty to seal it. This type of putty is strong and long-lasting, but it is not a permanent solution. After applying it, you should reinforce it by wrapping duct tape around it. You should also let the putty cure for the specified amount of time. The longer the cure time, the stronger and more secure the repair.

If you’ve tried other methods to patch up a leak, you might want to try epoxy putty. It’s an affordable option that creates a temporary leak-proof seal. You can buy Fix-It Sticks from Home Depot or a plumbing supply warehouse. This DIY fix can help you buy time until you can replace the copper pipe. The putty costs five to nine dollars, but you must be sure to turn off the main water supply before trying this method.

Using putty is the most common way to fix a pinhole leak in a copper pipe. Once the putty has cured, you can restore the pipe to service. You can also apply it to other pipes that are connected to the pipe. To prevent further damage, you should always turn off the water supply to the pipe before proceeding. You can also use a propane torch to speed up the drying process. The heat will turn the water into steam, which will escape through the open faucet.