P Trap Sink Smell

Run water down the sink drain at least once a month to prevent the trap from drying. If a drain has not been used for quite some time the water in the p trap can evaporate and cause sewage odor to escape. There is a small amount of water in the p trap that blocks sewer gas from escaping as shown in the picture below this can cause your drain to stink.

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Sometimes it happens that the sewer smell in the bathroom comes from the sink.

P trap sink smell.

Sewer gas smells and p traps every plumbing fixture and plumbing drain has a p trap on the drain if it is installed according to code. Like many others your sink probably has a hole at the top that allows fast drainage when the sink is full of water. If it fails at either one of these duties the result could be a smelly sink drain. If the sink trap dries the sewer smell fills the room.

An empty or dried out p trap is the most common cause of sewer gas smells. The u shaped pipe is designed to hold water to prevent rodents from entering the house as well as keeping sewer gases from coming up out of the drains. If the p trap is blocked or dry it would cause a sewage smell to emanate from the sink. Pouring 5 teaspoons of mineral or vegetable oil down the sink drain can help prevent the water from evaporating as quickly.

Its job is to trap debris before it creates a clogged pipe and to block sewer gases from entering your home through the sink drain. Underneath your bathroom sink there is a p trap. Smells emanating from the bathroom sink could be the result of bacteria growth on hair soap and other bathroom waste and if so cleaning the p trap and pouring baking soda in the drain are. Cleaning out the p trap.

The p trap is designed in a way that allows it to prevent the emission of sewer smelling gas into your residential area. If the sink is in regular use you can eliminate evaporation as a cause of the smell so it is either blocked or there is a leak preventing the water from getting to the bottom of the trap. The possible reason is clogging of the pipe that leads to dry p trap. A rancid odor coming from your sink drain may just be coming from debris in the p trap but if it smells like a sewer it probably means venting problems in your drain system.

Inside the drain there is some water that is trapped there. Refill your p trap sometimes the musty smell coming from your bathroom is related to a dry p trap. When the vents are blocked flushing a toilet can create sufficient vacuum to suck water out of the trap and allow sewer gases into your home. If the p trap is not vented correctly this could be the potential cause of the sewer smelling gas in your bathroom.

These p traps protect us from sewer gas. The p trap is the rounded pipe segment underneath your sink.

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