The answer to 'why is my septic tank frozen' is that the septic tank has frozen due to cold weather conditions. Septic tanks can freeze when the ground around the tank and pipes freezes, preventing the normal flow of wastewater. This is a common issue in colder climates during the winter months.
Some common causes of a frozen septic tank include inadequate insulation, shallow burial depth, lack of snow cover, and prolonged cold temperatures. Symptoms of a frozen septic tank may include slow draining sinks and toilets, gurgling noises, and sewage backups into the home.