bad sewer odor from sink

myex94 · Apr 7, 2014

our place is townhouse three years old town house we have restroom at first floor and the bathroom second floor and one extra sink Is out side next to the bedrooms after second year I start smell sewer odor from that sink I check the trap I open I clean was clean because house is brand new build I even clean overflow hole was clean that too I check the trap pipe there is a water in that trap so that means Is ok water should block that smell, as soon I empty one gallon bleach (Clorox) in the sink 2 month no smell at all after couple month the smell Is coming back again I have to empty one gallon bleach and smell goes away till couple month again smell comes back now lately the first floor restroom I start smelling that odor too from the sink please help any one can help me what is the cause to have that sewer odor ?
thank you
I want to remind again after I poor one gallon bleach ( Clorox) the odor goes away for couple month and I clean the over flow is clean remember my house is brand new build. And this a photo under my sink the trap

Smooky · Apr 7, 2014

Might be a bad Air Admittance Valve (AAV). I picture of the plumbing under the sink might help

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jennifersmith · Apr 7, 2014

Hi,

It can cause because of if the water in the trap was either being sucked out or leaking out. You can put some drain care and X14 cleaner down the sink overflow. It took a few days or times, but it finally cleared up.

Hope helps you!

myex94 · Apr 8, 2014

I add a pic under from under sink

Terry · Apr 8, 2014

That trap looks fine.

It may be from the overflow. There is a small passage way from the overflow to the drain that can have smells.

bad sewer odor from sink

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