Brown Toilet Water. Your water can also turn brown if iron oxide and other sediment somehow get stirred up in the hot water heater. For hard water stains prepare a paste of vinegar and borax.
One could be that you have. The most likely reason that your toilet water is brown is that there is rust somewhere in your system. Brown Water in the Toilet Tank Iron in the water is the main reason for brown discoloration.
Rust is a normal chemical reaction that occurs when when iron and oxygen come in contact with water.
Brown Stains and Hard Water. Your water can also turn brown if iron oxide and other sediment somehow get stirred up in the hot water heater. Secondly if you are experiencing brown tap water dont make any assumptions about the cause. This water isnt necessarily toxic or dangerous for your health but it can damage your home and is generally undesirable.