Keep these conditions separate
Keep these conditions separate
- Do not use a match, flame, switch, fan, or improvised smoke test to find an odor.
- Record whether it is at one drain, a cabinet, a wall opening, a mechanical room, or several floors.
- Note recent vacancy, cleaning, demolition, drain work, backup, wind or pressure changes.
- Keep occupants away if the odor is strong, causes symptoms, or cannot be safely classified.
The decision boundary
The decision boundary
People describe gas, sewer, musty and chemical odors with overlapping language. If there is any possibility of natural gas, leave and call 911 outside. For a drain-related pattern without emergency signs, note the exact location, timing, fixture use and whether an infrequently used trap may be involved.
Compare the proposed response
Compare the proposed response
- Has the emergency gas boundary been resolved by the appropriate authority?
- Is the suspected pathway a dry trap, failed seal, drain defect, vent issue, wastewater event, or still unknown?
- What non-destructive inspection comes before opening a wall?
- What follow-up period will show the odor is resolved rather than temporarily masked?
Official references
Check the source that owns the rule
Next notices
Continue with the related decision
Independent connection
Call for plumbing help
Describe the observable condition first. Confirm who answered, Boston 02108 coverage, the responsible licensee, availability, price, permit duty, and terms before authorizing work.