Plumbing Q: Stinky Sink drain .. any ideas?

Question

About two years ago, I had my 2nd story bathroom remodeled. For months, it was completely fine, but recently, there's a bad smell from the bathroom sink. It drains well .. But to get rid of the smell, I did try a draino type liquid. Didn't fix the problem. This has been going on for months now.

It smells like rotten eggs .. maybe sewer gas. As I said, the plubming under the sink is updated, up to code, and has a trap there, which would make me think it's not sewer gas. -- I've opened up the trap there, and it's clean as a whistle.

Also, generally, you smell it more when the water is on.

Could it be something like my vent pipe to the roof is clogged, forcing gas through the trap? -- No other drain in the house has this problem, btw.

Any ideas? Thanks in advance.

C & E · Accepted Answer

.It's possible to have a blockage in the roof vent pipe.  To clear your stacks just feeda running hose down the pipe until it stops.  I've done it - obviously a no brainer givethat little tidbit.This part is intriguing to me because I had a similar situation. You didn't mentionyour water source so if it's chlorinated public water this won't help.  I had bacterialgrowth in the water heating tank which required a shock treatment to kill off thebloom, but this was at a cabin with well water source which has a low bacteria count.Unfortunately for me, the tank became a incubator when used occassionally and turnedoff when not in use.  It took 5 or 6 months for this to happen.

Bubby · Answer

Please let us know what  you mean by a "drain issue".  I ask because I have a similar problem: I get this musty smell only in the spring and summer, the drain is fine in the winter.   If I put down the drain stopper, it is better (although not 100% because I can still smell it a bit from the small opening at the top of the sink). of the

Plumbing Q: Stinky Sink drain .. any ideas?

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