Sewage Smell in the House: Five Causes and How to Tell Them Apart
Sewer gas is not just unpleasant, it is a sign that a barrier somewhere has stopped doing its job. The good news is that the cheapest cause is also the most common.
A dried-out trap
Every drain holds a small plug of water that blocks gas from the line. In a guest bathroom, a floor drain or a rarely used tub, that water evaporates. Pour a couple of litres of water down every unused drain and wait a day. This solves a surprising share of smell complaints.
A failed wax ring under a toilet
If the smell is strongest in one bathroom and worse right after a flush, suspect the seal at the base. A toilet that rocks even slightly has already broken its seal.
Vent problems
Drain systems need air. A blocked or improperly terminated vent makes traps siphon dry as water drains, which lets gas straight through. The tell is a gurgling drain plus a smell that comes and goes.
A cracked or disconnected line
Under a slab or in a crawl space, a broken drain line lets gas into the structure without any visible water. This is where a camera inspection earns its cost, because you cannot see the defect any other way.
Something that only smells like sewage
Bacterial growth in a rarely used shower drain, a saturated garbage disposal splash guard, or a dead animal in a wall can all read as sewer gas. If nothing plumbing-related checks out, widen the search before you start opening pipe.
Water moving right now? Shut the main off first, then call (888) 809-6756. Dispatch is live open 24 hours, 7 days a week across every Florida city.