Plumbing Services in Smyrna, GA

A drain is more than a pipe running downhill. It depends on a trap to block sewer gas, a vent to let air in, and a cleanout so the line can be reached when it clogs. When one of the three fails, the symptoms can be confusing: a smell with no obvious source, a toilet that gurgles, a clog nobody can get to. Knowing these three parts makes many drain problems easier to explain, whether you fix them yourself or call Alpha Plumbing and Sewer for plumbing services in Smyrna.

Traps: the water seal under every fixture

The curved section of pipe under a sink, tub or shower is a trap. It holds a small amount of water that blocks gases in the drain system from rising into the room. Toilets have the same feature built into the porcelain. A trap only works while it holds water, so a guest bathroom or floor drain that goes unused for weeks can dry out and let a sewer odor in. Running water into it for a few seconds restores the seal.

Older houses sometimes have S-shaped traps, which tend to siphon their own water out as the fixture drains. When that drain is reworked, plumbers usually replace them with a vented P-trap. Traps also catch things: a dropped ring or a wad of hair usually ends up there, which is why many sink clogs can be cleared by opening the trap with a bucket underneath.

Vents: the pipes that let drains breathe

Water running down a drain needs air behind it. Without that air, the flowing water pulls against a vacuum, drains slowly and can suck the water out of nearby traps. Vent pipes connect to the drain system and run up through the roof, letting air in and gases out. A blocked vent usually shows up as:

• Gurgling in a sink or tub when another fixture drains.
• A toilet whose water level drops or rises by itself.
• Slow drains throughout one area of the house with no clog found in the pipe.
• A sewer smell indoors even though the traps are full.

Leaves, nests and debris are common culprits at the roof opening. Some homes use air admittance valves instead, which can let odor in if they stick open. Vent and branch drain problems are handled through drain repair.

Cleanouts: the access points

A cleanout is a capped opening that gives a plumber a straight path into the drain or sewer. You may find them at the base of a drain stack inside the house, behind a panel near a laundry, or outside near the foundation where the building sewer leaves. The exterior cleanout is the most important one, because it allows the main line to be cleared or inspected without pulling a toilet. Equipment for hydro jetting and a sewer camera inspection both work best from a cleanout. Houses without one often get a new cleanout installed as part of a main sewer line repair.

How the three work together

Picture a main line half blocked with roots. Each time the washer drains, water backs up slightly and pushes air through the system: nearby traps bubble, a toilet gurgles and a faint smell drifts from the tub. Plunging the toilet helps for a day, because the real problem is downstream. Opening the exterior cleanout and running a camera shows the roots in minutes, and knowing which part is reacting keeps a repair from treating the wrong symptom.

Simple checks, and what lies beyond the drains

Pour water into any drain that has not been used in a while, check that the exterior cleanout cap is intact and not buried under mulch, and listen for gurgling when the washer drains. If a smell lingers after the traps are refilled, the vents deserve a closer look. Problems on the supply side have their own services: faucet and valve repair for drips and stuck shutoffs, and leak detection for a meter that turns with every tap closed.

Smyrna permits and sewer connections

The city's Community Development Department takes permit applications online. Homeowners can pull permits only for the home they live in, so work on a rental generally goes through a contractor. When a new building sewer is connected, Smyrna's code requires the connection and testing to take place with the city's department director or a representative present.

Questions about drain traps and vents in Smyrna

What is an air admittance valve?

It is a one-way vent valve fitted under a sink or in an attic where running a vent pipe through the roof is impractical. It opens to let air into the drain as water flows and closes to keep sewer gas in. One that sticks open can let odor into the room, and one that sticks shut can make nearby drains gurgle. Whether it is allowed is up to the code and the inspector.

Can I clear a plumbing vent myself?

Some homeowners do, but it means working on the roof, which carries real risk. A blocked vent can be cleared with a hose or a drain snake from the roof opening. If you are not comfortable on a roof, or the gurgling continues, have a plumber check it.

Why does a bathroom smell like sewer when the traps are full?

A full trap rules out the most common cause, so the next suspects are a blocked vent or an air admittance valve stuck open, a toilet wax ring that has failed, or a cracked drain or vent pipe inside a wall. A loose or missing cleanout cap can let sewer gas in as well. Tracing the source sometimes takes a smoke test or a camera.

Ask us about the hidden parts

Gurgling, odors or a clog that keeps coming back usually trace to one of these three. Describe the symptom to Alpha at (404) 409-4448, and we will start there.