As we can see from the above list, sewer gas leaks can be very dangerous. It’s a good idea, then, to identify some of the reason’s sewer gas might leak into the home. Here are some of those causes:
One common cause is that plumbing fixtures and plumbing traps can become dried out. The plumbing trap usually has a water barrier which prevents sewer gases leaking back into the house. If this dries out, there is nothing preventing the gases from leaking. You could find this happening in bathrooms that are not used frequently or during dry weather periods.
Cracks that form in ventilation pipes, plumbing drains and even foundations could cause sewer gases to escape into the house. Plumbing vents which have been placed too close to air intakes are another cause. Then there is wind and air flowing around the building, this too can be the reason for sewer gas smells in the home.
From this short list, its clear to see the many ways sewer gas could leak into your home and create an unpleasant and unhealthy living environment. If you are smelling sewer gas in your house, have it checked out by a professional who can diagnose the source of the leak.