There is a certain peace that comes from locking your front door and leaving for a well-earned vacation. However, viral household tips can sometimes create unnecessary concern. One popular claim suggests covering every sink and shower drain with an upside-down glass or plastic bag before leaving. In most homes, this is unnecessary because the plumbing already has a simple defense against sewer gases.
Under most sinks is a curved pipe called a P-trap, which holds a small amount of water after the fixture is used. This water forms a seal that helps prevent sewer gases from traveling through the plumbing and entering the home. Similar traps are typically installed beneath showers, bathtubs, and floor drains. For vacations lasting several days or weeks, properly functioning traps generally provide enough protection.
Rarely used fixtures can eventually lose their water seal as the trapped water evaporates. Before leaving, run water briefly through sinks, showers, bathtubs, and other infrequently used drains. It is also wise to inspect areas around sinks, toilets, washing machines, dishwashers, and water heaters for leaks or moisture. Check appliance hoses and connections for cracks, corrosion, or looseness that could cause problems while you are away.
Some homeowners turn off the main water supply before traveling, which may reduce damage if a pipe or hose fails. However, certain heating systems, sprinklers, boilers, or irrigation equipment may require water, so check before doing this. Remove food scraps, empty trash, clean surfaces, and secure pantry items to discourage pests. If you return to a sewer smell, run water into the affected drain. Persistent odors may indicate a plumbing problem that requires professional attention rather than simply covering the smell.