The answer to 'why is my water line burst pipe' is that a burst water line is usually caused by freezing temperatures, corrosion, or physical damage. Symptoms include sudden loss of water pressure, water pooling around the pipe, and potentially water damage to your home. To fix a burst pipe, you'll need to shut off the main water supply, locate the break, and either repair or replace the damaged section of pipe.
In many cases, a burst water line requires the expertise of a professional plumber, especially if the pipe is buried underground or located in a hard-to-access area. Attempting DIY repairs on a burst pipe can be dangerous and may lead to further damage if not done properly. It's generally best to call a licensed plumber to assess the issue and provide a safe, effective solution.