In general, septic tanks and treatment plants are designed to be underground, providing natural insulation from frost. The soil acts as a protective layer to prevent the water in the tank from freezing. When wastewater is discharged from the property, it is relatively warm compared to freezing temperatures in the ground. This helps maintain a higher water temperature within the treatment plant.
For the biological processes in the tank to work effectively, the water temperature needs to be above 12 degrees Celsius. If the water level is nearing freezing, it indicates a serious problem with the biological process. In such cases, insulation options should be considered to protect the tank.
Customers may also want to consider shallow dig septic tanks, which are closer to ground level. However, this can make the tank more susceptible to colder temperatures. Nevertheless, in the UK, it is unlikely that temperatures will drop low enough for the water inside the tank to freeze. If customers have concerns, opting for a deeper installation can provide added assurance.
