What Causes Sewer Smell in House
Sewer odor inside your home is caused by sewer gas escaping through dried P-traps, cracked drain pipes, failed wax rings on toilets, damaged vent pipes, or a compromised sewer line. The gas contains hydrogen sulfide (the rotten egg smell) and methane.
Boise-specific factor: Boise's dry high-desert climate causes P-trap water to evaporate faster than humid regions. Guest bathrooms and basement floor drains are the most common culprits. Summer temperatures accelerate evaporation — this is our top summer complaint.
Signs You Have Sewer Smell in House
Watch for these warning signs in your home:
- ✓ Rotten egg or sulfur smell, especially in bathrooms or laundry room
- ✓ Smell is stronger in the morning or when house has been closed up
- ✓ Smell comes from a specific room or area
- ✓ Smell worsens when it's windy outside
Can You Fix This Yourself?
Run water in every drain for 30 seconds to refill P-traps. Check that all toilets are firmly seated. If the smell persists after refilling all traps, a cracked pipe or damaged vent is likely — this requires professional smoke testing to locate.
If the problem persists or you're unsure, call a licensed plumber. Attempting complex repairs without proper tools can cause further damage and void warranties.
How Our Plumbers Fix Sewer Smell in House
We perform a systematic check of all traps, toilet seals, and accessible drain pipes. For persistent odors, we run a smoke test — injecting non-toxic smoke into the drain system to visually identify leak points. We then seal, repair, or replace the failing components.
Experiencing sewer smell in house? Call now for same-day diagnosis.
Call (208) 555-0199 — Free EstimateSewer Smell in House Repair Cost in Boise
Typical cost to fix sewer smell in house in the Boise area: $75-$150 for trap and seal inspection, $200-$400 for smoke testing, $150-$800 for repairs. We provide an upfront quote before starting any work — no surprises.
How to Prevent Sewer Smell in House
Run water monthly in all drains including floor drains. Replace toilet wax rings every 10-15 years. Add mineral oil to floor drain traps to slow evaporation.
Frequently Asked Questions
Why does my house smell like sewer?
The most common cause is a dried-out P-trap — the U-shaped pipe under drains that holds water to block sewer gas. In Boise's dry climate, unused drains lose their water seal in 2-3 weeks.
Is sewer gas dangerous?
In low concentrations (occasional whiff), it's mainly unpleasant. Persistent strong odor indicates higher concentrations of hydrogen sulfide and methane, which can cause headaches, nausea, and in extreme cases are flammable.
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