Why Does a Drain Smell?

Homeowners shouldn't try to unclog the drains by removing the trap without professional assistance.

Few situations are as frustrating as trying to locate the source of foul odors around the home. Opening the windows and activating the fans can temporarily resolve the issue, but sometimes the odd smells won't go away. But more often than not, the culprit is one of the drains.

Let's discuss the most common causes of this problem and learn how homeowners can ensure their drains are in perfect condition.

The sewer gas trap

All drain pipes feature a slight bend, often called a trap. This downward-facing bend captures water and prevents sewer gas from entering the home through the drain. In addition, gravity stops the collected water from moving, and the traps refresh the water each time someone runs the tap.

When the trap malfunctions, the first reported issue is the foul smell.

But why does this happen?

Drains in old homes don't always have a trap. Sooner or later, the rooms will be full of odd smells.

Additionally, a leaky trap allows water to escape. Besides strange odors, homeowners may notice water beneath the sink, distorted textures, and discoloration on the floor or ceiling.

There's another relatively simple explanation. Not using any water for extended periods can also result in smelly drains. People typically face this problem after returning home from vacation.

Organic matter

If the trap is in good condition, a buildup of organic matter could be another reason for the odor.

Some throw food scraps, dish soaps, and other matter down the drain. Unfortunately, the waste sticks to the sides of the pipe, sometimes latching onto the plumbing and attracting countless bacteria. Most times, this buildup isn't a problem as long as it doesn't affect the pipe's interior diameter.

But a thick layer of organic matter may result in a drain clog and nasty smells. In such cases, a professional should perform a drain inspection to diagnose the issue.

If the odors come from the bathroom drain, hair buildup has likely accumulated inside the trap.

Homeowners shouldn't try to unclog the drains by removing the trap without professional assistance. They'll have to deal with recurring leaks if they leave the trap loose. Also, remember to refrain from using harsh chemicals. While they'll eliminate organic buildup, they'll also deteriorate the pipework and could lead to costly repairs.

Clogged vents

Blocked vents prevent water from draining and allow sewer gas to enter the kitchen and other home areas. Moreover, a clogged vent negatively affects the piping, creating a vacuum that removes water from the traps. As some homeowners have experienced, a dry trap can also be a source of foul odors.

Dirty garbage disposal

Garbage disposals are convenient, but rotting food stuck between the blades can fill the kitchen with a nasty odor. Home occupants should make sure they run enough water when using the sink and avoid dumping too much food at once.

Keep the drains clean and eliminate odd smells

Those dealing with a smelly drain should contact an expert immediately. The issue could indicate a clogged drain, leading to more severe problems if unaddressed.

Much Better Plumbing has many years of experience providing sewer cleaning and repair, pressure regulators, water damage restoration, septic tank service, and backflow services in Las Vegas, NV.