Sewer smell from cold water in 2nd floor sink

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Old 10-08-11, 01:09 PM
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Sewer smell from cold water in 2nd floor sink

When I first run the cold water the sewer odor is extremely strong but it goes away after being run for a couple of seconds. This sink is on the second floor master bath and is only used a handful of times per week. It is definitely coming from the pipe and not the drain. I would greatly appreciate some help with this. Thanks
 
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Old 10-08-11, 02:30 PM
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I had the same problem. I figured out was it was. I was only using the spare bathroom a few times a year. I have been told that I need to run the water more often, to keep the water traps full of water. This keeps unpleasant odors from wafting up into the house. I started running the water more in the unused bathroom, and this resolved the problem.

I am not positive that this is the cause. Please wait for input from experienced plumbers.
 
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Old 10-08-11, 02:47 PM
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City water or private well?...............
 
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Old 10-08-11, 03:31 PM
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Oops, sorry I forgot to mention it's city water.
 
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Old 10-08-11, 04:00 PM
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Do you get water immediately upon opening the tap? or is there a puff/gurgle of 'air' first?

I don't really have any ideas at this point, just trying to throw some ideas out there...

I'm wondering if there is some 'off gassing' of the water and that gas is traveling up to the upper levels and collecting in a high spot in the pipe...

bluesbreaker has a good point though... if the trap were to dry out... maybe when the water from the tap first pushes into the trap, it displaces the stanky air... and makes it seem as though its the tap water stinkin?

I guess you could check that theory by first closing the drain and filling the bowl with water... but you've probably already done that!
 
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Old 10-19-11, 01:24 PM
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It appears the odor is most definitely come from the cold water line. I tried running the hot water for several seconds with no odor but as soon as I ran the cold the odor appeared. I also poured some bleach down the drain and let it sit overnight. In the morning I poured a pot of hot water down the drain and after running the cold water I smelled the odor again. I even closed the drain plug and ran both the hot then cold and smelled the odor only coming from the cold line.

I'm at a loss with this. If the water itself was the cause of the odor why is it only detected coming from this one sink? I should note that I think I detected this odor coming from my outdoor hose after running it for the first time after returning from vacation. It may have even had a bit of white foam. I should also mention that I changed the faucet and supply lines and the problem still persists.
 

Last edited by carquote; 10-19-11 at 02:08 PM.
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