Why is there an occasional septic smell coming from my kitchen sink?

Question

We do not live on a sewer system. I am hoping it is not septic tank failure.

Answer 1

The most overlooked cause in a smelly sink, is actually that 'P' trap, sometimes called a 'J' trap. The way that trap works, to prevent sewer gases from coming back up the drain, is that it uses water to form a block. If there is no water, or not enough water, in that trap to form a seal, then the gases can come up through the drain.

Some drain/waste/vent systems are not adequately vented, for one reason or another, and a sudden drain at another location in the home, for example the washing machine, or toilet, may have enough suction, to pull the water out of that trap, or at least enough of it to allow the gases to get up the drain.

I would recommend that you take some notes.... what was going on in the home before you noticed the smell? You can probably figure out which other drain, is causing the 'vacuum' on the sink drain.

Simplest fix, of course, is to simply shoot some more water into the drain from the faucet....this is a quick fix, and will help you determine if this is actually the problem, and by following up on your notes, you should be able to determine which drain in the house it is, that needs more ventilation. For example, if you notice the smell more often after doing a few loads of laundry, on a regular basis...then you may want to look at that portion of the drain/waste/vent system.

For that... you may want to call in a plumber, but, if you feel comfortable doing it yourself, you would simply need to cut into the drain system near the one causing the problem, and run a stack up through the roof. Or, you might even be able to cut into an existing stack in the attic, and join it with the new vent pipe.

Good Luck

Answer 2

More than likely you have a plugged air line to the roof. If your agile enough run a garden hose down the line and have your wife turn it on for a minute, don't fall. Watch for water backing up in the sink also. It's probably a hornets nest in the line.
Your other option is to call a plumber and pay the price. He'll do about the same with a snake. If you have or can borrow a snake, try it.

Answer 3

If you have a garbage disposal, squeeze a lemon in there, and turn the disposal on including the rest of the lemon cut up. Vinagar down the sink may help or baking soda. Give it a try you have nothing to lose. Vinagar once a month helps all drains. Hoyakins

Answer 4

it variety of feels you're nevertheless thinking this stink is coming from the drain yet i'm questioning whether it is a few thing below the sink. I propose doing an intensive seek. stable good fortune.

Answer 5

you should have your septic tank emptied EVERY year. Some people don't realize this. Check it out.

Answer 6

p-traps prevent odor and vermin from coming out the fixture. perhaps the smell is around the sink not from the sink. from outside perhaps?