The answer to 'bathtub rusty water' is that it is typically caused by corroded plumbing pipes or fittings. Over time, the metal in the pipes can oxidize and release rust particles into the water, resulting in a reddish-brown discoloration. This can be a common issue, especially in older homes.
Some common symptoms of rusty water in the bathtub include staining of the tub and fixtures, as well as an unpleasant metallic taste or odor in the water. In some cases, the rust may also clog showerheads or faucets, reducing water flow.