If you’ve noticed bluish-greenish stains in your bathroom and other water appliances, you’re probably wondering if it’s a sign of a more serious problem.
Well, it depends on what’s causing the stains in the first place.
Blue or green stains in your sink/bathtub/toilet can be caused by:
Not sure which is your issue? We’re here to help.
We’ll show you how you can determine what’s causing your stains and what you should do to prevent them in the future.
There are thousands of different kinds of mold. But one in particular, Penicillium, has a blueish-greenish hue.
Penicillium on bathtub faucet. Source
Mold growth is best removed by using an EPA-registered mold and mildew disinfectant.
But unfortunately, your bathroom will always be very prone to mold growth because of the amount of moisture readily available.
According to the EPA, the best way to get rid of indoor mold is to control moisture and leaks. Some ways you can do this include:
Corrosive water is “aggressive” water that eats away at the materials it comes into contact with. So, if your bathroom piping is made of copper, lead or other metals, the bluish stains in your bathroom could just be the insides of your corroded pipes.
Corrosive water can be determined by its pH levels, calcium concentration, hardness, etc. So, the only way to know for sure if your water is corrosive is to have your water tested.
But other signs of corrosive water include:
Note: Corrosive water is usually not dangerous to consume but it is a nuisance many homeowners prefer to avoid.
Cleaning the bluish-greenish stains caused by corroding pipes is easy. Just mix vinegar and baking soda into a paste, apply to the stains and wait about 10 minutes before wiping off.
To prevent these stains, you’ll want to have your water tested to see what is making your water so corrosive. Depending on your particular problem (low pH levels, level of salt in water, etc.) you can most likely find a whole-home water filtering system that can correct it.
If your plumbing is composed of different types of metals, the blue or green stains might be caused by electrolysis. Electrolysis happens when two different kinds of metals touch in the presence of water. The “least noble” metal (the one that is more reactive) will start corroding.
For example, if a stainless steel pipe touches a copper pipe, the copper pipe will start corroding because copper is less noble than stainless steel. And corroding piping leads to bluish, greenish stains in your bathroom appliances.
Corrosion occurred here where copper piping attaches to galvanized steel. Source
The best way to tell if electrolysis is causing the blue-green stains in your bathroom is to have a plumber take a look at your piping and determine if dissimilar metals are being used.
You can use the same baking soda and vinegar paste to remove stains caused by electrolysis.
To prevent it from happening again, you’ll want to have a plumber find the source of the issue and replace the piping with a nonmetal.
If you can’t get rid of those annoying stains in your bathroom, we’re here to help. Mr. Plumber provides expert plumbing service to Atlanta, Marietta, Roswell, Alpharetta, Johns Creek, Newnan, Lawrenceville, Jonesboro and the entire Atlanta metro area.