The answer to 'why is my septic tank frozen' is that the septic tank has likely frozen due to cold winter temperatures. Septic tanks can freeze when the soil around the tank or the wastewater inside the tank gets too cold, preventing the system from functioning properly.
Common causes of a frozen septic tank include lack of insulation, shallow burial depth, and prolonged cold weather. Symptoms may include slow draining sinks and toilets, gurgling sounds, and sewage backups. To fix a frozen septic tank, you may need to insulate the tank, add a heater, or have the tank professionally thawed. In some cases, the entire system may need to be replaced if the freeze has caused damage.