The answer to 'why is my water line clogged' is that there are several common causes, including mineral buildup, tree root intrusion, and debris accumulation. Symptoms can include low water pressure, gurgling noises, and slow draining sinks or tubs. Solutions may involve snaking the line, hydro-jetting, or replacing sections of the pipe.
If the clog is in the main water line leading into your home, this is typically the homeowner's responsibility to address. However, if the issue is in the municipal water supply line, you'll need to contact your local water utility. For serious clogs or damage, it's best to call a professional plumber who can properly diagnose and fix the problem.