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Old 09-16-2015, 09:47 PM   #1
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Cool Odors from bathroom sink

I've been reading other posts about black tank odors but don't see anything regarding black tank odors coming up through my sink drain. Run the water and the odor comes up the drain. Only happens in the bathroom, not the shower or kitchen, which has it's own grey tank. Changed the under cabinet vent valve without any change. Tried conditioners, no luck. Even checked roof vents for critters.
Does the black tank have an overflow into the grey tank contaminating the grey?
Any thoughts?
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Old 09-16-2015, 09:54 PM   #2
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Your vanity sink should drain into the gray tank not the black tank. Black tank is only for the toilet. They should not be connected in any way. But, your gray tank could be the source of your odor..not sure why running water in your sink would cause the odor to appear, it is more likely when little water has been run and the water in the trap evaporates, allowing gases from the tank to enter the living area. Food particles from the kitchen sink, among other things if not properly rinsed out, can break down and cause odors. Also, if your gray tank valve is left open, you can get sewer gas coming back through your dump hose. Campgrounds typically have a trap below each drain outlet, but, some older campground don't' have this trap.

I would rinse your gray tank well...if your hooked up to a sewer, try keeping your valve closed and, add some bleach into the gray tank.

Good Luck...
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Old 09-16-2015, 10:23 PM   #3
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Hope you don't have a dead critter in the P-trap. Sounds like something is stuck in there and the odors arise when you run water down the drain. Does it drain slowly?
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Old 09-16-2015, 10:33 PM   #4
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Check all piping under the sink. Is a joint loose or a pipe cracked? That's the only way I could imagine the odor if the vent valve has been replaced and there is water in the trap. Good luck and be sure to post when you solve.
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Old 09-16-2015, 10:49 PM   #5
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Could be your roof vent is clogged or blocked at the Y that goes to the gray tank. That Y is the only place the two tanks are connected. I believe they both vent through the common roof vent.
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Old 09-17-2015, 08:51 PM   #6
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Thanks everyone. I keep the valves closed until full, checked the vents for blockages, don't have cracked pipes and have tried 2 different conditioners. I'm going to try baking soda and maybe even bleach with a good soak. It's really puzzling. When this is solved I will post results.
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Old 09-20-2015, 06:39 AM   #7
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Odors seem to be a really big problem. We have never had the problem before our 5th wheel. But now sometimes, we get the black tank odor in the kitchen living room area. Not sure how this could be, but it happens. Not in the bathroom, but in the kitchen. We are going to put a little Lysol down each drain to see if that helps. Going home today but did notice that is mostly prevalent in the heat of the day.
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Old 09-20-2015, 07:20 AM   #8
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namusmc65, you may have a faulty air admittance valve under the sink. It admits air to the drain line to help it drain, and has a one way valve that is supposed to keep odors from escaping. Here is a short article discussing this type of valve: ASTVD Valve (clicky)
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Old 09-20-2015, 08:53 AM   #9
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Also be aware of odors coming in a roof vent if the sewer vent is downwind of your roof vent.
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Old 09-20-2015, 12:32 PM   #10
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I had stinky sink drains and finally removed the traps and cleaned them- they had some nasty stuff growing in them. Seemed to help with the smell.
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