Symptoms
- Gray, white, or brownish ring at the waterline
- Ring returns after normal cleaning
- Bowl feels slightly rough where the ring is
- Other fixtures in the home may have similar deposits
Likely causes
- CommonHard water mineral depositsCalcium and magnesium in the water settle and harden at the waterline over time.
- CommonInfrequent cleaning allowing buildup to setThe longer scale sits, the harder it bonds to the porcelain.
- PossibleLow water level exposing a new stain lineA drop in tank water level can shift where the ring forms, making an older, softer ring more visible.
What to do
- Turn off the water supply and flush to lower the bowl water level so you can reach the ring directly.
- Apply a toilet bowl cleaner formulated for hard water or mineral stains, or straight white vinegar, and let it sit 15–30 minutes.
- Scrub with a toilet brush or a wet pumice stone made for toilets, working in the direction of the porcelain glaze.
- Rinse and repeat if needed for older, more stubborn rings.
- Turn the water back on and flush a few times to check the result.
- Clean weekly going forward to prevent the scale from re-hardening.
Tools and parts
- Toilet bowl cleaner or vinegar
- Toilet brush
- Pumice stone (for toilets)
When to call a pro
A plumber isn't needed for cleaning, but a water treatment pro can help if hard water is a recurring whole-house issue.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.