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What Causes Sewer Gas Smell In The House

by Peter Wilson

Sewer gas smell is a common problem in many households. It is a foul odor that can be very unpleasant and can make it difficult to live comfortably in your home. The smell is usually caused by a build-up of gases in your plumbing system. In this article, we will explore the various causes of sewer gas smell in the house and what you can do to prevent it.

What is Sewer Gas?

Sewer gas is a mixture of gases that are produced by the decomposition of organic matter. It is a combination of gases such as methane, hydrogen sulfide, ammonia, carbon dioxide, and nitrogen. These gases are produced by the breakdown of human waste, food waste, and other organic matter that is present in the sewage system.

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What Causes Sewer Gas Smell In The House?

There are several reasons why sewer gas smell can occur in your home. Here are the most common causes:
Dry P-Trap:

One of the most common causes of sewer gas smell is a dry P-trap. A P-trap is a curved pipe that is installed under your sinks, toilets, and other plumbing fixtures. It is designed to hold a small amount of water that acts as a barrier to prevent sewer gas from entering your home.
If the P-trap dries out, it can no longer prevent the sewer gas from entering your home. This can happen if you have not used a particular plumbing fixture for a long time. For example, if you have a guest bathroom that is rarely used, the water in the P-trap can evaporate, allowing sewer gas to enter your home.

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Clogged Vent Pipes:

Another common cause of sewer gas smell is clogged vent pipes. Vent pipes are vertical pipes that are installed in your plumbing system to allow air to enter and exit the system. They are designed to prevent a vacuum from forming in the pipes, which can cause water to drain slowly or not at all.
If the vent pipes become clogged, the air cannot enter or exit the plumbing system, which can cause sewer gas to build up and enter your home.

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Damaged Sewer Lines:

If your sewer lines are damaged, they can allow sewer gas to enter your home. Sewer lines can be damaged by tree roots, shifting soil, or other factors. When this happens, the sewage can leak into the ground, allowing sewer gas to enter your home through cracks or other openings.

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Improperly Installed Plumbing Fixtures:

If your plumbing fixtures are not installed correctly, they can allow sewer gas to enter your home. For example, if the wax ring that seals your toilet to the floor is not installed correctly, it can allow sewer gas to enter your home.

Blocked Drains:

Blocked drains can also cause sewer gas smell in your home. When your drains are blocked, water can back up into your plumbing system, causing sewer gas to build up and enter your home.
What Can You Do To Prevent Sewer Gas Smell In Your Home?

Here are some tips to prevent sewer gas smell in your home:

1. Keep Your P-Traps Filled With Water:

To prevent your P-traps from drying out, make sure to use all of your plumbing fixtures regularly. If you have a plumbing fixture that is rarely used, such as a guest bathroom, make sure to run water through it every few weeks to keep the P-trap filled with water.

2. Keep Your Vent Pipes Clear:

To prevent your vent pipes from becoming clogged, make sure to keep them clear of debris such as leaves, sticks, and other debris.

3. Repair Damaged Sewer Lines:

If you suspect that your sewer lines are damaged, contact a professional plumber to have them repaired as soon as possible.

4. Ensure Proper Installation Of Plumbing Fixtures:

Make sure that your plumbing fixtures are installed correctly to prevent sewer gas from entering your home.

5. Keep Your Drains Clear:

To prevent your drains from becoming blocked, make sure to keep them clear of debris such as hair, food waste, and other debris.

Conclusion:

Sewer gas smell can be a very unpleasant problem in your home. However, by understanding the causes of sewer gas smell and taking steps to prevent it, you can keep your home smelling fresh and clean. If you are experiencing sewer gas smell in your home and are unable to identify the cause, contact a professional plumber to help you identify and fix the problem.

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