Don't ignore sewer odors
A sewage smell inside your home usually means sewer gas is escaping somewhere it should not. Besides being unpleasant, sewer gas can signal a plumbing problem that will get worse. Here are the most common causes.
Common causes
Dry P-traps. Floor drains, guest bathroom sinks and showers that are rarely used can dry out, letting gas in. Run water in each drain for a minute.
Loose or failed toilet wax ring. A broken seal under the toilet lets gas escape and water leak. See toilet repair.
Clogged or blocked vents. Plumbing vents on the roof can be blocked by debris or nests, causing gurgling drains and odors.
Partial sewer blockage. Grease, wipes and roots cause slow drains and odors before a full backup. Drain cleaning and hydro jetting clear them.
Cracked or broken sewer line. Damaged pipe under the slab or in the yard can leak sewage and gas. A sewer camera inspection finds the damage and sewer line repair fixes it.
Sewer backup. If sewage is coming up into tubs or floor drains, you need sewer backup service right away.
When to call
If the smell persists after running water in every drain, or you notice gurgling, slow drains or wet spots in the yard, call a plumber. If you smell rotten eggs near gas appliances instead, that may be a gas leak; read our gas leak safety guide and leave the home.
Quick Answers
Is sewer gas dangerous?
In small amounts it is mostly unpleasant, but higher concentrations can be harmful. Find and fix the source.
Can a sewer smell come from the yard?
Yes. A broken sewer line or cleanout cap can release odors outside.