Sewer gas forms as a result of the decomposition of organic household or industrial wastes. It consists of a mixture of gases, including hydrogen sulfide, ammonia, and more. It usually smells like a rotten egg due to the presence of hydrogen sulfide. This won’t be toxic at low levels. However, prolonged exposure or higher levels of it can cause signs of sewer gas poisoning.

Now let’s look at the causes of sewer gas leaks in your home as well as the DIY remedies.


Modern plumbing systems have methods to protect homes from sewer gas leakage. There are some likely causes for a sewer gas smell at your home; most of them are the result of plumbing failures.


If there are leaks in your plumbing system because of inappropriately positioned pipes or vents, there is a chance to become exposed to sewer gas. It can also leak into your house if plumbing vents are installed very close to a window. In some cases, leaks from septic systems can come in through fissures in the foundation.

Cracked pipes

Sewer system pipes are intended to protect the inside of your home from disclosure to the results of human waste. If your pipes are cracked or wrecked, sewer gas may leak through them and into your home.

Blocked air vents

Air vents are accountable for circulating toxic gases away from your home. If your air vents are blocked, like with dirt, debris, or other items, they may not be able to vent your home suitably. This can make sewer gas to build up in the pipes and leak into the home.

Clogged drains

Similar to air vents, drains are responsible for the carrying of toxic waste through the septic system. If your drains are clogged from some items, it can cause a sewage backup. If this isn’t treated, the clog can carry on to decompose and leak sewer gas back into your home.

Dry plumbing

The drive of water through sewer systems aids a barrier against potentially harmful gases. If plumbing systems, such as toilets and drains, are not used for a while, they can dry out and lose their water barrier. This can cause the area to become dry, which allows sewer gas to leak into the house.

Loose toilets

Toilets are an essential part of the sewer system in your home. To keep you safe from leakage of gas from the pipes, toilets should always be firmly fitted to the sewer lines. An unfastened toilet can cause a gap in the pipes and lead to a leakage of sewer gas into your home.


If you doubt there is a sewer gas leak in your home, first try to detect where the leak is coming from. Check all floor drains, toilets, and vents to make sure nothing is cracked, blocked, clogged, or loose. After you have found the source of the leak, book an appointment with a plumber from Wrench it up for an inspection. While you are waiting for the inspection, vent or air out your home. Be sure to keep drains and plumbing air vents clean.


If you think there is a sewer gas leak in your home, get in touch with a plumber right away. Our expert plumbers can evaluate your home for possible leak areas. They can fix the leak and recommend you with the best tips for how to keep your plumbing system working properly. Nevertheless, if you suspect a sewer gas leak and are also feeling symptoms of high-level exposure, seek out emergency medical attention and an emergency plumber from Wrench it up right away.

COVID-19 Update: In this critical time of the COVID-19 pandemic, we are taking extra efforts to ensure health and safety of our customers, technicians and community as we continue providing 24/7 plumbing services. Learn more about COVID-19 updates and safety measures at Wrench it up.