Maybe you’ve noticed blue-green stains creeping across your sink or tub, had a water heater fail years before it should have, or found a pinhole leak in a pipe in the basement. These can all be signs of corrosion, but identifying exactly what’s causing the problem isn’t always straightforward.
Corrosive water doesn’t necessarily have a single cause. Water chemistry, dissolved gases, mineral content, plumbing materials, and even electrical conditions can contribute to corrosion, while other factors can accelerate damage that’s already occurring. Understanding what’s happening in your home is the first step toward finding the right solution.
Is Low pH the Cause of Corrosive Water?
Low pH is one of the most common causes of corrosive water. Water with a pH below 7.0 is considered acidic and can gradually react with metal pipes, fixtures, and water-using appliances.
A pH test provides an important piece of information, but it doesn’t tell the whole story. Even water with a relatively neutral pH can contribute to corrosion when other conditions are present.
What Else Can Cause Corrosion in Plumbing?
Several factors beyond pH can contribute to corrosion or influence how quickly it occurs.
Galvanic corrosion happens when dissimilar metals connect within a plumbing system, such as galvanized steel and copper. The metals can react electrochemically, causing one to deteriorate more rapidly. This can be a concern in older homes throughout Central Pennsylvania where plumbing systems have been repaired or modified with different materials over the years.
Dissolved oxygen in water can contribute to oxidation when it reacts with metal plumbing components. Depending on the water chemistry and plumbing materials, higher concentrations of dissolved oxygen can increase the potential for corrosion.
Stray voltage or electrical current can also contribute to corrosion when electrical current travels through metal plumbing or other components of a water system. This type of corrosion may require looking beyond water chemistry to identify and correct the underlying electrical issue.
Water velocity and pressure aren’t typically primary causes of corrosion, but they can increase the effects of corrosion that’s already occurring. Higher velocities, for example, can contribute to erosion-corrosion and accelerate deterioration at vulnerable areas such as fittings, bends, and joints.
Taken together, these variables explain why a pH reading alone may not reveal what’s happening. Corrosion can result from several interacting conditions within both the water and the plumbing system.
Why Identifying the Cause Matters
Treating corrosive water effectively depends on understanding its source. If low pH is responsible, an acid-neutralizing system may be appropriate. But equipment designed to correct acidic water won’t resolve galvanic corrosion, stray electrical current, or another issue within the plumbing system.
Misdiagnosing the problem can mean months or years of continued damage to pipes, fixtures, and water heaters while the underlying cause remains unaddressed. It can also lead to investing in water treatment equipment that doesn’t solve the actual problem.
Not sure what’s causing your water problems? A free water analysis from Martin Water Conditioning can provide valuable information before you invest in a solution.
What Does a Professional Water Analysis Tell You?
A professional water analysis goes beyond a single pH reading to provide a more complete picture of your water chemistry. Combined with an evaluation of the symptoms you’re experiencing and the characteristics of your home’s plumbing system, those results can help narrow down the potential causes of corrosion.
In some cases, the solution may involve water treatment, such as correcting acidic water with a neutralizer. In others, the source may involve plumbing materials, electrical conditions, or another issue requiring a different approach. Identifying those distinctions is essential to recommending the appropriate next step.
Can You Monitor Corrosive Water After Treatment?
Once the source of corrosion has been identified and the appropriate solution is in place, periodic monitoring can help ensure conditions remain where they should be. Home pH testing can be useful when low pH was the original concern, while routine maintenance helps keep installed water treatment equipment operating properly.
The important thing is knowing which condition you’re monitoring. Because corrosion can have multiple causes, continued problems shouldn’t automatically be attributed to pH or water treatment equipment without considering the larger picture.
Get to the Root of Corrosive Water Problems
If you’re seeing blue-green stains, pinhole leaks, premature water heater failure, or other signs of corrosion, finding the underlying cause is the first step toward protecting your plumbing and water-using appliances.
Schedule a free water analysis with Martin Water Conditioning. We’ll help you better understand what’s happening with your water, identify factors that may be contributing to corrosion, and determine the appropriate next steps for your home.