Take the 2-minute tour ×
Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. It's 100% free, no registration required.

We bought a 1967 year old ranch 2 years ago and have been experiencing a foul smell coming from our bathroom sink. We have been putting bleach, vinegar and soda down the sink and overflow over and over again but the foul smell keeps coming back. What do you think the problem may be?

share|improve this question

2 Answers 2

A blocked vent is probably the most likely culprit. Other things to consider: leaking plumbing from a low point in the trap under the sink letting the trap drain, evaporation of the water in the trap if this sink is rarely used.

Some sinks do not have a true vent, and may have in place aa AAV (Air admittance valves-AAVs or Durgo valves or Studor vents). In my experience, these are poorly designed and allow sewer gas to seep through.

Sometimes really old hair that has been in a drain pipe for a long time will smell pretty bad. Not a sulfur smell like sewer gas, but more like a poop smell.

share|improve this answer

If the sewer vent serving that drain is blocked, you may get sewer gasses bubbling past the trap. The fix involves getting someone up onto the roof where that vent comes out so they can clear out that vent stack.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.