Noticing a faint sewer odor when others in your household do not can be caused by heightened personal olfactory sensitivity to sulfur and methane gases, localized air currents carrying stagnant odors from a single dry P-trap near you, or an accumulating organic biofilm inside a specific sink overflow channel that is close to your face during use. Alternatively, temporary sinus conditions can distort odor perception. Verification: Check infrequently used guest sink traps and overflow ports closely to rule out minor localized bacterial growth.
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