A sewage smell inside the house is unpleasant and, more importantly, usually a sign something in your drain or vent system isn't working the way it should.
Every drain has a P-trap that holds a small amount of water to block sewer gas from coming back up. In a rarely used sink, shower, or floor drain, that water can evaporate, letting the smell through. Running the tap for a minute usually solves it.
Vent pipes let sewer gas escape safely through the roof. A blocked or cracked vent can push those odors back into the house instead.
If the smell is persistent, paired with gurgling drains or multiple slow fixtures, it can point to a crack, clog, or root intrusion in the main sewer line.
A strong, sudden sewage smell paired with backed-up drains is worth calling a plumber the same day — it can mean the line is blocked and close to backing up into the house.
Dealing with this in your home? Sewer Line Repair is available 24/7 across California.