The answer to 'why is my water line overflowing' is that there is likely a blockage or break in the water line causing excessive pressure and water to back up and overflow. This can be caused by a variety of issues, such as tree roots invading the pipe, a buildup of debris, or a crack or break in the line itself.
Some common symptoms of an overflowing water line include water pooling around the home, a sudden drop in water pressure, or the sound of water rushing even when no fixtures are in use. If you notice any of these signs, it's important to address the issue quickly to prevent further damage to your home.