The answer to 'why is my septic tank burst pipe' is that a burst septic tank pipe is often caused by a blockage, damage, or corrosion in the septic system. Common symptoms include sewage backing up into the home, foul odors, and slow draining sinks and toilets. Solutions may involve unclogging the pipe, repairing a crack or hole, or replacing the entire pipe segment.
If the burst pipe is within the septic tank or in the underground pipes leading to the drain field, it's best to call a professional septic service technician. They have the tools and expertise to properly diagnose and fix the issue. Attempting DIY septic repairs can be dangerous and may cause further damage if not done correctly.