Why Does My House Smell Like Sewer?

Guides / Sewer Lines

Start with the easy causes

Dry traps

Every drain has a U-shaped trap holding water that blocks gas. In Colorado's dry climate, a guest shower, basement floor drain, or utility sink can evaporate dry in a few weeks. Pour a quart of water into each one. A spoonful of cooking oil on top slows evaporation in drains you rarely use.

Toilet wax ring

The seal under the toilet can fail without leaking water. If the smell is strongest at the base or the toilet rocks, the ring needs replacing.

Dirty overflow or disposal

Bathroom sink overflows and garbage disposals collect gunk that smells like sewage. Clean them before assuming a bigger problem.

Causes that need a professional

• Vent problems — a blocked or cracked vent can siphon traps dry or leak gas into walls. Gurgling is a clue; see why drains gurgle.
• Cracked drain pipe — common in older cast iron, which corrodes from the inside.
• Main line problems — a partial blockage can push gas back through fixtures, especially with slow drains.
• Open cleanout or loose fitting — often after earlier work or in unfinished basements.

How we track it down

We check traps, seals, and fixtures first. If the source is hidden, a sewer camera inspection shows cracks, separations, and corrosion inside the pipe. Learn what a camera inspection shows.

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Local Help Near You

We handle this problem every week across the Pikes Peak region: Colorado Springs, Monument, Larkspur, Castle Rock, Castle Pines, Peyton, Woodland Park, Fountain, Manitou Springs, Security-Widefield, Falcon, Black Forest, Palmer Lake, Cimarron Hills, Stratmoor Hills.