Sewer Gas Smell service traces unpleasant odors to dry traps, failed toilet seals, blocked vents, loose cleanout plugs, or damaged drain piping. Seattle Plumbers diagnoses the source and restores the plumbing barrier that should keep sewer gases outside occupied rooms.
Common Signs and Locations
Common signs and locations include a rotten-egg or sewage odor near a bathroom, basement, laundry room, utility sink, or floor drain. The smell may appear after a fixture sits unused, during windy weather, or when another fixture drains.
Check for patterns such as:
- Odor strongest near one drain or toilet base
- A rarely used sink, shower, or floor drain
- Gurgling followed by a loss of trap water
- Smell near a cleanout, wall cavity, or vent route
- Odor that returns after temporary drain cleaning
- Visible leakage or staining around waste piping
What Causes Sewer Gas Odors
What causes sewer gas odors is a missing or failed seal between the drainage system and indoor air. Water can evaporate from a P-trap, a vent problem can siphon the trap, and a failed wax ring can leak air around a toilet. Cracked drain piping, an open cleanout, biofilm, or an improperly connected vent can create similar symptoms.
Safety Steps for Strong or Sudden Odors
Safety steps for strong or sudden odors include opening doors or windows when this can be done safely and leaving the area if the smell is intense or causes headache, nausea, or dizziness. Do not rely on odor to measure risk. Methane can be present without a noticeable smell, and other fuel-gas leaks can be mistaken for sewer odor.
If you suspect natural gas, leave immediately and call 911 and the gas utility from outside.
How We Diagnose the Smell
How we diagnose the smell starts by mapping where and when it occurs. We inspect trap seals, toilet bases, floor drains, cleanout plugs, accessible drain piping, and vent connections. Drain or smoke testing may help reveal an air leak that is not visible during a basic inspection.
Sewer Odor Repairs
Sewer odor repairs match the confirmed opening. Service may include filling or priming a dry trap, resetting a toilet with a new seal, tightening a cleanout plug, clearing a vent obstruction, or replacing damaged waste or vent piping. We test the affected fixtures after repair and verify that trap water remains in place.
Schedule Sewer Gas Smell Service
Schedule Sewer Gas Smell service with Seattle Plumbers when a persistent sewage odor enters your Seattle property. We locate the plumbing source, repair the failed seal or pipe, and explain practical steps to prevent the odor from returning.