Let’s start with the easiest-to-resolve cause of yellow water in your toilet: standing water.
In this case, you’ll probably receive a notice from your water supplier explaining that work is being carried out. You may also be issued a boil water notice.
Calcium buildup is the most likely reason why the water in your toilet tank or bowl appears to be yellow.
Calcium is present in high quantities in hard water. Since an estimated 85% of water supplies in the USA are hard, there’s a good chance that calcium is the culprit of your toilet’s yellow water.
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