The answer to 'why is my toilet rusty water' is that rusty water in the toilet is typically caused by corroded or old plumbing pipes. Over time, the metal pipes can rust and release iron particles into the water, resulting in a reddish-brown color.
Some common symptoms of rusty toilet water include staining on the toilet bowl, a metallic taste or smell, and discoloration of water when flushing. This is usually not a serious health concern, but it can indicate a larger plumbing issue that needs to be addressed.