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Plumbing in the Home/odor from bathroom sink drain


Tara wrote at 2007-07-04 02:26:10
Hi. I saw the other question about the smelly bathroom sink and was impressed by the  thoroughness (is that a word?) of your answer. I have a similar problem. We moved into our house in February. It is a house that was built in 1959, but was expanded to include an upper level in 2001. In our master bath (upstairs) we get a sewage-y kind of smell sometimes. It will come for a few weeks, then get better for a few days and then come back. It is the only faucet that we notice this coming from. The other upstairs bathroom does not seem to have any odor... Nor do we get any odor from the shower in the same bathroom. I don't particularly notice it any more or less with cold vs. hot water... and again, it only seems to come from this one faucet. We had a plumber over to do some unrelated work and I had him look at this. He said he wasn't sure why (Of course it didn't smell when he was her). He cleaned out the drain (hair, etc.) and snaked the pipes (because it had been draining slowly for about a week or so). The odor is still there. Any ideas?



Me wrote at 2007-07-11 22:37:57
We have remodeled our bathroom with the original Corian product where the drain is a specific Corian product. Currently, it is no longer available. We are frequently removing the drain and cleaning out a terrible black gunk. not bleach or drain cleaner or anything else we have tried solves the problem. I have not found any Dupont information about this original product. I cannot believe no one else has had this experience.

Deb wrote at 2008-01-15 18:12:15
Exactly the same issue. I have been paying my plumber for several years to come every few months to clean out the area under the sink where he says there is a void under the sink near the overlow.  This void allows the "black gunk" to build up.  Any attempt to clean it with methods other than taking the drain apart do not meet with a clean smell.

tom wrote at 2009-02-03 19:53:16
Corian sinks have an issue with the overflow tube that directs water from the overflow hole in the top edge of the sink down to the drain.  A little bit of water collects at the junction of the tube and the fitting than joins the sink to the drain.  That little bit of water starts stinking after a while just like you described.  Pour bleach into the overflow hole

Paul wrote at 2009-06-01 21:12:40
Never pour bleach into a drain.  Bleach is very caustic and will even eat through stainless steel.  Don't make this mistake.

Loo Studio wrote at 2010-10-19 16:49:19
I found a solution! After I cleaned the trap, I followed your great advice to clean the rod and the space around it. These seemed to help, but the problem was still there and specifically the overflow from the overflow tube in this box store "corian" style bathroom sink. When I carefully plunged, leaving the top part of the overflow tube open , but shielded not to make a mess, out came the "GUNK". Now Im on my way to the dollar store to find a long, narrow, tube shaped brush to have on hand.

Mike wrote at 2015-04-22 21:21:08
We had new Corian bathroom vanity tops with built in Corian sinks. There was a hole drilled for overflow and a polyethylene type tube runs from the elbow connection in the overflow hole to a fitting at the base of the sink. Everything was fine for about 3 months and then we began to experience a foul sewer-tye odor that was very unpleasent. Corian sent somebody out who didn't help at all. A plumber came today and removed the tube and had me look inside and smell it; it was AWFUL and the souce of the odor. He sees this a lot with Corian overflow assemblies. The "fix" is to pur 2% hydrogen peroxide down the overflow tube and let it work for awhile (you can hear it fizzing as it attacks the bacteria and crude. He follows this with hot water in the basin collected up to the overflow and which has dilute bleach. When the drain is opened the solution flushes out the drain pipe too. This is a problem of a biofilm collecting on the interior lumen of the tube and drain assembly. Bleach (sodium hypochlorite) dissolves dead organic material and it is flushed away. We used this in dentistry to clean the lines of our dental units that had a biofilm. This must be repeated on sa schedule (usually monthly or every two months). No more problem.

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About me: My Plumbing Expertise: I retired from plumbing after a lifetime in the trade. all phases from service and upkeep to construction, both residential and commercial. I am qualified to do anything in plumbing from fixing a leaky faucet to drafting a set of plans for a commercial shopping center and supervising the construction. My last five years were spent as a trouble shooter for a large plumbing company. I took on all my companys complaints. I have been a expert on the plumbing page at In a field of 200 experts my rating was number one. You may also find me at and AskMe Help This is fun for me and if I can help anybody out that`s iceing on the cake. Degrees & Certifications: As for degrees, I don`t have any. Just a Journeymans ticket, but hey! How about fifty years experience?


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