Match the pattern to a likely source
- IfSmell only in a room that has been vacantThenA dry trap in the sink, tub or floor drain is common; run water to refill it.
- IfSmell near the toilet baseThenCheck the wax ring or seal and look for moisture on the floor.
- IfSmell that comes and goes with other roomsThenPossible venting or shared stack issue; involve engineering or plumbing.
- IfSmell in the shower onlyThenCheck the drain, the trap and any hair or debris.
- IfSmell with slow drainageThenPossible clog or partial blockage; ask plumbing to check.
Quick checks housekeeping can make
- Check
- Run water for a minute in each fixture
- Why
- Refills dry traps
- Next step if present
- Recheck the smell after a while
- Check
- Look for standing water or damp spots
- Why
- Suggests a leak
- Next step if present
- Notify engineering
- Check
- Smell near the drain and the toilet base
- Why
- Locates the source
- Next step if present
- Report which one
- Check
- Check the exhaust fan
- Why
- A weak fan lets smells linger
- Next step if present
- Report to engineering
- Check
- Look at the floor drain cover
- Why
- Missing covers let gas rise
- Next step if present
- Report for replacement
Sewer gas can be more than an annoyance. Prolonged exposure to strong sewer gas is a health and safety issue, and persistent or very strong smells should be handled by a plumber or engineering lead, not by housekeeping alone. A faint smell that vanishes after running the water is typically a dry trap, and in many hotels a routine of running water in vacant rooms prevents it.
If the smell keeps coming back, look beyond the single room. A vent stack that is blocked or damaged can cause multiple rooms on a line to have the same issue. Recording which rooms have complained, with dates, helps engineering see the pattern and decide where to look.
Remember that odor products placed in a drain do not repair a trap, a seal or a vent. They may hide the smell briefly but the underlying cause remains.
A practical habit is to pair the water routine with the room inspection so it is not a separate task. When an inspector enters a vacant room, running each fixture for a short time takes seconds and is easy to log. For long-vacant rooms, such as those held out of inventory, a scheduled routine is more reliable than relying on memory. Where a smell persists after the trap has been refilled, escalate with the room number, the fixture and the time, so engineering does not need to start from scratch when they arrive.
Common questions
How often should vacant rooms be flushed?
Policies differ. Many properties set a routine so that no drain sits dry for long.
Does a bad smell mean a major plumbing failure?
Not necessarily. A dry trap is the most common cause, but a recurring smell deserves a closer look.
General information for Downtown Denver, not a quote or professional advice. In an emergency, call 911.