What does a pink ring mean?
You could occasionally notice a pink ring in your toilet. Why does this matter?
While mold may be to blame for a pink ring in your toilet, Serratia marcescens [4] bacteria can also be to blame. These bacteria produce a pink, orange, or red pigment that thrives in moist settings.
Iron found in the water as a result of ancient pipes may also be the source of a pink toilet ring. All of your home’s toilets will likely be affected if this is the root of the problem.