Many residences are seasonal in cold climate countries. Shutting down septic tanks and sewage treatment plants for the winter is of the highest importance for seasonal homeowners to extend the life of their septic system and septic tanks and to keep it in good operation. Precautions that will be taken during the fall season will help prevent septic systems from freezing and avoid surprises in the spring.
The beginning of the winter season is a good time for a general inspection of septic systems. A good recommendation is to ensure proper drainage of the water supply lines of the septic system before the winter. Check any flexible hoses to ensure they are drained completely. By ensuring that all water is out of the lines you will avoid freezing the pipes.
Indeed, with cold weather moisture vapor from the house may start to freeze when it comes into contact with the cold metal of the vent pipe. Low temperatures may cause more and more water vapor to freeze on the inside of the vent pipe, eventually until it gets frozen shut. This problem can even occur in occupied residences.
Septic tank gases generated cannot exit through a vent pipe that is frozen shut; instead, they may escape into the house through plumbing traps.
An insulated vent pipe can be the answer to this problem. Modifying the height and location of the vent is another possibility and may help.