Stinky water in bathroom sink

Hmmm you got me thinking on this one ....

if it is in the hot water only it is from the hot water tank. mine does that when it sits for a few weeks between trips if I forget to drain it don't know what causes it maybe there is a chemist out there that can answer that?

Let me know what you come up with, K-9 Keno.

Hot or cold. Doesn't matter. We were on the road for 6 months using it every day so it wasn't from sitting. If Lazy Days finds it I will post it on here to let y'all know.

Sometimes you just have to drain all water tanks (hot & cold) and re sanitize.

We have had a sulfur smell when it sits in the hot water tank for too long. Re-sanitize.

Are you sure it is coming from the 'water' and not coming up out of sink drain ???

Pull 'P' trap and clean out the gunk

Air admittance valve under the sink? When you run water it somehow opens the valve...
Or, the lines going to the sink have an alien organism growing in them?
I'm just guessing, please let us know when you find the cause.

I know we get alot of strange smells sometimes from our bathroom when we have the bathroom exhaust fan running... I suspect that is being pulled up through the pot however as it does not use a P-TRAP...

Also being a pig farmer back in my growing up days on the Southern Illinois farm sort of got used to all the smells haha.... (Whats the problem haha)

Roy Ken

If you are running the bathroom fan, it may be sucking air back up through the Ptrap when the water runs. Or, you may have a bad air admittance valve under the sink. You can easily change the latter yourself for much less than a dealer will charge you to do it.

If neither one of those seems to be the issue, try thoroughly sanitizing your entire water system. There may be something growing in a section of water supply line near that sink, that got missed during sanitizing.

Your bathroom sink dumps right in to the BLACK tank. When running water, you have opened the drain for fumes to pass from the black tank up though the plumbing line and in to your bathroom. These fumes will not be present when the trap is full of water but when water is running, like while brushing your teeth or washing your hands, the P-trap is open due to the water flow. As soon as the water is turned off, the seal is once again complete.