ScheduleorCall (720) 605‑7270

Cooper logo
Return to all articles

Why Is There a Sewer Smell Coming From My Bathroom?

Cooper Nose Plugging

If you’ve noticed a persistent sewage odor in your bathroom, even when it hasn’t been used, it’s a sign that there might be an underlying issue inside or beneath the toilet. This isn’t just about unpleasant smells; it could point to a more significant problem that needs addressing.

In this article, we’ll delve into the typical reasons behind these unwelcome bathroom odors and guide you on when it might be time to call in a professional. Some of the common culprits include:

Let’s take a closer look at each of these possible causes of unpleasant bathroom odors.

Need a toilet repaired or replaced?

The Cooper Green Team has more than 45 years of experience with bathroom plumbing repairs. Get our 5‑star service and 100% satisfaction guarantee when you schedule service with us.

Dry P‑Traps

Cooper Piping Under Sink

A p‑trap is a curved pipe designed to hold water continuously, serving as a barrier to prevent sewer odors from entering your home. In bathrooms that aren’t used regularly, the water in the p‑trap may evaporate, leaving you with a bone-dry pipe and lots of room for odors to pass through.

Resolving this issue in an infrequently used bathroom is often as simple as pouring half a gallon of water into the toilet and flushing. This action refills the p‑trap, reestablishing the barrier against sewer gasses. If adding water doesn’t resolve the problem, the p‑trap may not be the source, or you may require a replacement pipe fitting.

Blocked or Clogged Vent Pipes

Vent pipes are air regulators for your entire plumbing system, allowing air to enter and facilitate the smooth water flow through your drains. They play a crucial role in enabling your toilets to flush effectively.

When your vent pipes are blocked or clogged, the first sign is often an unpleasant odor from the toilet. It’s often best to call in a professional plumber if you suspect the vent pipe is the cause oLeaky toilet wax ringf the sewer smell in your bathroom.

Leaky Toilet Wax Ring

When you install a toilet, a wax ring seals the waste pipe from the toilet to your sewer line. Over time, this ring can degrade, leading to several potential problems. If you notice that your toilet rocks when you sit down on it, that’s a telltale sign that there’s something wrong with your toilet mount, and usually, the wax ring is the culprit.

Since the ring is the only seal that keeps your toilet waste in the sewer pipe, you may have sewer odors wafting from that bathroom’s fixture if it starts to leak. Replacing the wax ring involves uninstalling the toilet, cleaning out the old wax, putting a new one in place, and re-installing the toilet. It’s generally a fairly quick job for a professional.

Sewer Line Issues

Anything that blocks or reduces water flow through your sewer lines can cause unpleasant odors to seep into your home. Your plumbing system is carefully calibrated based on the water flow your pipes allow. If something impacts that flow, it can cause problems.

A clogged or broken sewer line is often the cause of any sewage odors inside your home. If your underground sewer line is damaged, you might notice odors outside your home. Either way, if there’s a problem with your sewer line, you’ll need a licensed plumber to help with the repair.

Dried Out or Damaged Seal on the Floor Drain

While most residential homes don’t have floor drains in the bathroom, if yours does, it could be the source of any unpleasant odors. If the seal on your floor drain dries out or gets damaged, it can leak. Any leaking fixture attached to your drains can cause odors to back up into your home. If your toilet drain pipe is also clogged, you face a double problem with odors and sewage backing up through the floor drain.

Do you need help from an expert plumber?

If you’re smelling sewage when you walk into the bathroom, call the Cooper Green Team today for educated advice from highly-trained plumbers when you schedule service. All of our plumbing services are backed by a 1‑year renewable labor warranty, and we offer free estimates on all new installations.

Lukes Head Shot jpg

Luke Cooper

Related Articles