Why Does My House Smell Like Sewer? Common Causes and Solutions

There’s nothing quite as unsettling as stepping into your home and being greeted by a foul sewer-like smell. Not only is it unpleasant, but it could also indicate a serious problem with your plumbing. If you’re wondering, “Why does my house smell like sewer?” this blog will help you understand the common causes of sewer odors and what you can do about them.

Common Reasons For Sewer Smells In Your Home

1. Dry P-Traps

P-traps are U-shaped pipes located under sinks, showers, and drains, designed to trap water that acts as a barrier to prevent sewer gases from entering your home. If a P-trap dries out (often due to infrequent use), it stops performing its function, allowing foul odors to waft through.

Solution: Pour water into the drain to refill the P-trap. To avoid this issue in the future, run water down unused drains regularly.

2. Clogged or Blocked Drains

Over time, debris like hair, grease, food waste, or soap scum can build up in your drains, leading to clogs. These clogs can trap stagnant water, creating a breeding ground for bacteria, which in turn can produce foul odors that resemble sewer gas.

Solution: If you suspect a clogged drain, professional drain cleaning services such as hydro jetting can clear out the buildup, restoring proper drainage and eliminating the odor.

3. Sewer Line Blockages

A blockage in your main sewer line can cause waste to back up into your home, leading to a sewage smell. This is a more serious issue, as it not only causes bad smells but can also result in sewage backups that damage your property.

Solution: Call a professional plumber immediately if you suspect a main sewer line blockage. Specialized equipment like sewer cameras can pinpoint the location of the blockage, and hydrojetting or other sewer cleaning methods can be used to clear it.

4. Cracked or Broken Sewer Pipes

A cracked or damaged sewer pipe under your home or yard can cause sewer gas to seep into your living spaces. This can happen due to age, shifting soil, tree root intrusion, or other factors.

Solution: If you notice a persistent sewer odor, it’s essential to have a professional plumber inspect your pipes for cracks or breaks. Repairing damaged sewer lines promptly can prevent more serious issues like leaks and foundation damage.

5. Improper Venting

Your home’s plumbing system is equipped with vents that allow sewer gases to escape outside. If these vents are blocked, damaged, or improperly installed, it can cause sewer gas to build up inside your home.

Solution: If improper venting is the issue, a professional plumber can check for blockages, install new vents, or repair existing ones to ensure proper gas flow.

6. Toilet Seal Problems

The wax ring under your toilet creates a seal between the toilet and the sewer line. If this seal becomes worn or damaged, it can allow sewer gas to escape into your bathroom.

Solution: Replacing a faulty wax seal is a job for a plumber, as the toilet must be removed and reinstalled correctly to ensure a tight seal.

7. Biofilm Buildup in Drains

Over time, organic materials can accumulate in the drains and create a slimy film known as biofilm. As bacteria break down this biofilm, they produce unpleasant odors that can mimic sewer gas.

Solution: A professional drain cleaning can remove biofilm buildup and keep your drains running smoothly, eliminating the bad smell.

---

The Sewer and Drain Experts

A sewer smell in your home can be more than just a nuisance—it can indicate a serious plumbing issue that needs immediate attention. If you’re experiencing persistent sewer odors in your home, it’s best to contact a professional plumber for an inspection.

At Steady Flow Sewer & Drain, based in Western Washington, we specialize in diagnosing and solving sewer-related problems quickly and efficiently. Whether you need a thorough drain cleaning or a sewer line inspection, we’re here to help restore your home’s comfort.

Need help with a sewer smell? Contact Steady Flow Sewer & Drain today to schedule an inspection or consultation.