What causes pink water stains?
Christopher Snyder
Updated on March 05, 2026
About the Bacteria
Many experts agree that the bacteria that causes these pink stains is most likely Serratia marcescens, a bacteria which is found naturally in soil, food, and in animals. Serratia, which produce a characteristic red pigment, thrive on moisture, dust, and phosphates and need almost nothing to survive.How do you prevent pink water stains?
The Best Ways to Prevent Pink StainsKeep your bathroom dry, and the humidity at its lowest. Turn on a ventilation fan to keep the air circulation running, and open a couple of windows to decrease humidity. Keep your toilets clean as well, to prevent the bacterial colonies from making homes in them.
What causes pink stains in shower?
The pink colour is from a pigment (prodigiosin) produced by Serratia marcescens under the right growing conditions. Serratia marcescens is commonly referred to as “pink mold” or “pink mildew” but it is bacteria causing those irritating pink stains in the bathtub and on your shower head.Is Serratia marcescens harmful?
Today, Serratia marcescens is considered a harmful human pathogen which has been known to cause urinary tract infections, wound infections, and pneumonia. Serratia bacteria also have many antibiotic resistance properties which may become important if the incidence of Serratia infections dramatically increases.What mineral in water causes pink residue?
While some pink stains are caused by overly-metallic water, the most common cause of the colorful, slimy stuff is Serratia Marcescens.How to Get Rid of Pink Slime Around the Drain - Pink Mold No More
How do you get rid of Serratia marcescens in water?
To clean pet water dishes, bathrooms, and kitchen surfacesDisinfect the surfaces where the slime has formed with a strong chlorine bleach solution. Leave the disinfectant solution on the affected surface(s) for 10 – 20 minutes before thoroughly rinsing away with clean water.
How do you get rid of Serratia marcescens in the shower?
Throw shower curtains in the washing machine to sanitize.Running your pink-tinged curtain through the washing machine on a gentle wash cycle with warm water effectively removes Serratia marcescens bacteria and any associated stains.
What happens if Serratia marcescens is left untreated?
S. marcescens has been shown to cause a wide range of infectious diseases, including urinary, respiratory, and biliary tract infections, peritonitis, wound infections, and intravenous catheter-related infections, which can also lead to life-threatening bacteremia.Can Serratia marcescens go away on its own?
Although extremely rare, it can also cause pneumonia and meningitis. Once s. marcescens has established itself on a surface, completely eliminating it can be very difficult. Total eradication of the bacteria can be only accomplished with a bleach-based disinfectant or cleaner.What disinfectant kills Serratia marcescens?
Though Serratia will not survive in chlorinated drinking water, the bacteria can grow in toilets where water is left standing long enough for the chlorine to dissipate. To kill the bacteria, clean affected surfaces with a strong chlorine bleach solution.How do I get rid of pink residue in my shower?
Shower Walls & DoorsCreate a cleaning paste with 1/4 cup of baking soda and 1 tablespoon of liquid dish soap. Using a soft bristle brush, apply paste to the bacteria and scrub away the pink film. Rinse. Once the pink is gone, you'll need to disinfect the area.
How do you prevent pink bacteria in the shower?
Tips to Prevent Pink Mold From Coming BackIt's best to start the fan before you shower and leave it on for at least 20 minutes after your shower to reduce the humidity in the room. Dry your shower walls and shower curtains after each use to eliminate excess water and moisture. A towel or squeegee should do the trick.