Symptoms
- Orange or brown streaks in the bowl
- Staining near the waterline or under the rim
- Stains return quickly after cleaning
- Other fixtures may show similar staining
Likely causes
- CommonIron or manganese in the water supplyWell water or older municipal lines can carry minerals that oxidize into rust-colored stains.
- PossibleRusting metal parts inside the tankAn old metal float rod or corroded fitting can shed rust into the water.
- PossibleRusting supply line or old pipesCorroding galvanized pipe upstream can introduce rust particles.
What to do
- Try a bowl cleaner made for rust and mineral stains, or a paste of borax and vinegar or lemon juice, letting it sit before scrubbing.
- Use a pumice stone made for toilets (wet, not dry) on stubborn spots, working gently to avoid scratching the glaze.
- Check inside the tank for any rusting metal parts and replace them with plastic or coated alternatives.
- Test other fixtures like a bathtub or sink for similar staining to confirm it's a water supply issue.
- Consider a whole-house iron filter or water softener if staining is widespread and recurring.
Tools and parts
- Pumice stone (for toilets)
- Borax or dedicated rust cleaner
- Rubber gloves
When to call a pro
Consider a water treatment professional if rust staining appears throughout the house, to test the water and recommend a whole-house filtration solution.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.