You are in Phoenix. We also have a Tucson site.

You are in Phoenix. We also have a Tucson site.

You are in Phoenix. We also have a Tucson site.

Sewer Gas: What’s Causing the Smell and How to Fix It


Sewer gas is not only unpleasant but can also be harmful to your health. If you’ve ever caught a whiff of that unmistakable stench, you’re likely wondering how it got into your home and, more importantly, how to get rid of it. Let’s take a closer look at what causes sewer gas, why you might be smelling it, and what steps you can take to address the problem.

Key Takeaways

  • Sewer gas is produced by the decomposition of organic materials in the sewer line and often has a distinct methane odor.
  • Common causes include overflowing septic tanks, dry P-traps, or clogged vent pipes.
  • If you suspect sewer gas in your home, it’s essential to address it quickly by running water through fixtures, using gas detectors, or calling a plumber.

Now, let’s explore the specifics of what causes sewer gas and how it can make its way into your home.

What’s Causing the Stink?

Sewer gases, whether toxic or non-toxic, are produced by the decomposition of organic materials and household waste in your sewer system. The most common gas associated with this is methane, which gives off the distinct, unpleasant smell you may have experienced.

While methane is also produced by the human digestive system, the odor from decomposing materials in the sewer line can be much more potent and far less pleasant.

Why Am I Smelling Sewer Gas?

The most important question: why is sewer gas entering your home? Typically, it should stay in the sewer, but there are several reasons it could make its way into your living space:

1. Overflowing Septic Tank

If you have a septic tank, an overflow could be the source of the smell. Septic tanks should be pumped every 3-5 years to prevent this from happening. If it’s been a while since your tank was flushed, it might be time to schedule a service.

2. Clogged Septic Vent Pipe

Another possible cause is a clogged vent pipe. While this is less common, a blockage can prevent sewer gases from escaping properly, forcing them back into your home. This is an issue best addressed by a professional plumber.

3. Dry P-Trap

A P-trap is the U-shaped pipe under your sink or other plumbing fixtures that traps a small amount of water. This water acts as a barrier, preventing sewer gases from coming up through the pipes and into your home. However, if a fixture hasn’t been used in a while, the water in the P-trap can evaporate, allowing gases to seep through.

Fortunately, the fix is simple: just run water through the fixture to refill the P-trap and block the gas from entering your home. Repeat this process regularly for any plumbing fixtures that aren’t used often.

How Can Sewer Gas Affect Your Health?

While the smell of sewer gas is enough to make you uncomfortable, prolonged exposure can have serious health consequences. Methane, the primary component of sewer gas, can displace oxygen in the air, potentially leading to symptoms like:

  • Headaches
  • Dizziness
  • Nausea

In more severe cases, exposure to high levels of sewer gas can lead to difficulty breathing or other health issues. If you smell sewer gas in your home, it’s important to address the issue promptly.

What Can You Do About Sewer Gas?

If you suspect that sewer gas is present in your home, there are several steps you can take:

  • Run water through infrequently used fixtures to ensure P-traps are filled.
  • Consider using a gas detector to monitor your home for sewer gas.
  • Call a professional plumber to perform a thorough inspection and address any issues with your septic tank, vent pipes, or plumbing system.

At Parker & Sons, we offer reliable inspections to detect and resolve any issues with sewer gas in your home. If that unpleasant smell makes its way into your space, don’t hesitate to contact us!

Final Thoughts: Keep Sewer Gas Out of Your Home

Sewer gas isn’t just a nuisance; it can also pose a health risk. You can keep your home safe and smell-free by staying proactive and addressing the common causes—like dry P-traps, overflowing septic tanks, or clogged vent pipes.

If you have any concerns about sewer gas in your home, don’t wait. Contact Parker & Sons today for a professional inspection and get peace of mind.

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