The answer to 'water line making noise' is that there are several common causes, including water pressure issues, pipe corrosion, and loose or vibrating pipes. Symptoms may include banging, whistling, or humming noises coming from the water lines. Potential solutions can range from adjusting the pressure regulator to replacing worn-out pipes, depending on the root cause.
In many cases, homeowners can troubleshoot and address minor water line noises through DIY fixes. However, if the problem persists or you're unsure of the cause, it's best to call in a professional plumber to properly diagnose and resolve the issue.