Every home has several P-traps connecting their sinks and appliances to the sewer and keeping the sewer gas out of the building, but when one of them fails, you have all kinds of trouble on your hands. Sewer gas can be very harmful to your health, so it is in your best interest to keep it at bay. But how can a p-trap fail? Since it is a very simple mechanism, it is also a very simple reason why it would fail. Whenever the water that is supposed to sit in the turn of the p-trap disappears for any reason, it will no longer work as an effective seal against the sewer.
This commonly happens with sinks that aren’t used very frequently. The water can evaporate from the p-trap, leading to a broken seal. It is also possible that a p-trap that is improperly installed could be leaking water, eventually leaving the p-trap with insufficient water in it. If this is the case, you should get the p-trap repaired or replaced as soon as possible.
On the other hand, if the issue is that the water is evaporating due to lack of use, you might want to install a tap primer that will kick in whenever the water level in the p-trap falls below a certain level, filling it back up.