The answer to 'my water line smells bad' is that the most common causes are a buildup of bacteria, mineral deposits, or debris in the water line. This can lead to a foul, rotten egg-like odor coming from your taps or fixtures. Symptoms may include the smell, discolored water, or reduced water pressure.
Some potential solutions include flushing the water line, treating the water with chlorine or other sanitizers, or replacing sections of the plumbing if the issue is more severe. However, it's important to identify and address the root cause to prevent the problem from recurring.