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Lynne
Sour smell from bath faucet

We get a sour smell when the cold water faucet is first turned on in our below-grade bathroom sink. Cleaning the drain eliminates the odor for only a day. What could cause this?

It is a conventional drain flowing to a Liberty sewage ejector pump embedded in the concrete floor. The sink is used daily; as are the shower and toilet which do not have this problem.

MLB Construction
Re: Sour smell from bath faucet

is the sink properly vented? if it isn't, when the toilet or shower are used and the water runs through the drain pipe it can pull the water out of the trap on the sink causing you to smell the sewer gases.

Lynne
Re: Sour smell from bath faucet

The plumber installed a Studor vent to support this bathroom. I checked that the vent is still unobstructed.

The odor occurs the first moment the sink water is turned on and dissipates quickly. It occurs without the shower or toilet being in use.

I just now removed the aerator and cleaned it; maybe that will help. Time will tell, I guess.

MLB Construction
Re: Sour smell from bath faucet

those vents are not legal here....don't know what the code is where you are.

Lynne
Re: Sour smell from bath faucet

They are permitted here (King County WA). If the vent were failing I'd think the whole basement would smell.

johnjh2o
Re: Sour smell from bath faucet

The smell could be coming from the overflow on the sink. Try pouring some bleach into the overflow.

dj1
Re: Sour smell from bath faucet

When I have a smelly sink, I do what John recommended:

1. Plug the sink and fill with water with bleach-water mix, let it overflow into the overflow.
2. Keep adding bleach. repeat 2-3 times.
3. Do it weekly for a month and then see if the situation improves.

Mastercarpentry
Re: Sour smell from bath faucet

Studor vents are legal here but maybe not below-grade; all I've even done were above grade- I don't know if that matters. I'd think the uplift pump tank has to be vented to the outside anyway, so I'm wondering about why the Studor vent was installed. Most important is that Studor vents are not allowed out of convenience to the plumber; they are to be used ONLY where it's impossible or highly impractical to run a proper vent. Even if it isn't related to your problem I'd eliminate the Studor vent if it were practical to do so.

Doing a job correctly usually involves extra work. There's no room in the building trades for laziness that ends up with failure.

Phil

Lynne
Re: Sour smell from bath faucet

It turned out the problem was a harmless bacteria in the well water that happens to thrive in the braided stainless steel water hose. Hot water kills this bacteria so the problem was only on the cold side. Flushing the line helped only temporarily. The braided hose was replaced with Pex and the problem went away.

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