Most people go through a familiar checklist before leaving for vacation—adjusting the thermostat, clearing out the refrigerator, watering the plants, and making sure everything is locked. But there’s one small detail many people overlook, and it can lead to an unpleasant surprise when they return. When a home is unused for several days or weeks, a lesser-known part of the plumbing system can allow mild odors to develop, making the return home feel less refreshing than expected.
Beneath the sink is a P-trap, a curved pipe that holds a small amount of water. This water serves as a barrier that helps reduce the chance of sewer gases or small insects entering the home through the drain. Daily use keeps this water level stable. However, when the sink is not used for an extended period, the water inside the P-trap may gradually evaporate, which can lead to noticeable odors drifting up from the drain…
