The answer to 'why is my drain trap rusty water' is that a rusty drain trap is often caused by corrosion or mineral buildup. Over time, the metal in the drain trap can start to rust, leading to discolored water. This is a common issue, especially in older homes or areas with hard water.
Some common causes of a rusty drain trap include exposure to moisture, chemical buildup, and age. If left unaddressed, a rusty drain trap can lead to leaks, clogs, and other plumbing problems. In most cases, the solution is to replace the drain trap, which is a relatively simple DIY project. However, if the issue is more extensive or you're uncomfortable working on your plumbing, it's best to call a professional plumber.