Question: The drain pipe from the kitchen sink smells bad. There is water in the P trap. Have used Liquid Plumber Twice. The water runs freely like all other drains in the house which is 4 yrs. old. Never had the problem before. I have to keep the sink plugs in when not using the sink.Could you tell me what may be causing the smell? Thank You
Answer: A number of things could be causing the smell. It is most likely rotten food or material that has gotten into your pipes. Unfortunately, a bad smell from your drain pipes is a signal that bacteria has “infested” your pipes and needs to be cleaned.
Most people tend to freak out when they hear this and want to call a plumber. Luckily, you can cure this problem on your own through a number of different methods. Perhaps the most effective method is outlined in this eHow article on removing a bad smell from your sink: http://www.ehow.com/how_4503875_bad-smells-out-sink-drain.html.
You can also try grabbing a slice of some lemon and wash it down the garbage disposal on a nightly basis. The citric acid seems to keep the bad smells away and prevents gunk from building up. When you get down to it, you will find often that the cause of the bad smell coming from your sink will be one of three things. Either your drain pipe is clogged at the P trap in which case you can remedy that by taking if off and cleaning it out. Or the issue may have to do with the vent coming up through your ceiling is not working properly and therefor the ventilation of the foul smelling sewer gases oozing up from the bottom of your drain trap is not moving out through the vent at your roof level. Go up to the roof and check to see if some animal like a squirrel or bird has not built a nest to block the vent from working properly.
Hope that helps. If you have any more questions please ask them in the comments area!