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Old 05-23-2012, 10:32 PM   #1
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Sewer Gas Smell


For the last 2 days I have been getting a pungent sewer gas smell from a cabinet in my kitchen. This cabinet is not under the sink, but it is against the wall where I believe the main vent runs.

It has been raining pretty bad for 2 or 3 days as well. I noticed a few things:

1 The smell is present in the cabinets of all bathroom sinks
2. I don't smell anything from the drain openings
3. The smell was almost gone then the wife ran the dishwasher - WREAK!

Am I correct in assuming that there must be a clog in a vent pipe?
All the drains flow quickly. Could there be a clog at the main sewer trap outside the house which could cause the smell?

I have never had this issue in the 5 years we've lived here. The house was built in 1993 so I know all the fixtures have P-traps and no modifications to the plumbing have been made.

My plan is to go to the roof & snake the vents (& run some water in them) to see if it clears this out. Should I open & check the sewer main trap outside, or is that not needed since all the drains flow quickly?

Any guidance would be GREATLY appreciated.


Last edited by cabreco; 05-23-2012 at 11:28 PM.
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Old 05-23-2012, 10:55 PM   #2
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Sewer Gas Smell


Have you been under the house to see if perhaps you have a broken line below?


What kind of traps do you have? Are they S-Traps? (famous for self siphoning)

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Old 05-23-2012, 11:27 PM   #3
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Have you been under the house to see if perhaps you have a broken line below?
My house sits on a slab with no crawlspace.

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What kind of traps do you have? Are they S-Traps? (famous for self siphoning)
Yes they are all S-traps
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Old 05-24-2012, 12:18 AM   #4
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Sewer Gas Smell


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My house sits on a slab with no crawlspace.



Yes they are all S-traps
But you said your house was built in '93 and your traps were p traps.
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Old 05-24-2012, 05:17 AM   #5
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But you said your house was built in '93 and your traps were p traps.
My apologies, due to the hour I was writing this (the problem is weighing heavy on my mind) I mis-typed.

The house uses all P-TRAPS
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Old 05-24-2012, 09:12 AM   #6
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My apologies, due to the hour I was writing this (the problem is weighing heavy on my mind) I mis-typed.

The house uses all P-TRAPS
Pictures of the traps would be great at this point.
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Old 05-24-2012, 05:02 PM   #7
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Pictures of the traps would be great at this point.
P-Trap
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Old 05-24-2012, 07:37 PM   #8
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Sewer Gas Smell


Could it be a wind eddy problem with the vents? Do you keep your windows open this time of year?

Are you on a septic tank?
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Old 05-24-2012, 07:50 PM   #9
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Could it be a wind eddy problem with the vents? Do you keep your windows open this time of year?

Are you on a septic tank?
Nope, city sewer and the cental a/c is running. One thing that was brought to my attention is the huge amount of rain we've had recently, & the fact that my developement was build on what once was a swamp. The fact that I have a sewr easement on my propert doesn't help.
I have been recommended to put down lime for the odor.
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Old 05-25-2012, 02:12 PM   #10
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Sewer Gas Smell


1. Smell from a cabinet in the kitchen where the main vent runs but not in kitchen sink cabinet.
2 The smell is present in the cabinets of all bathroom sinks
3. I don't smell anything from the drain openings
4. Never had smell in 5 years.
5. All P-traps.
6. Raining pretty bad for last 2-3 days.
7. The smell was almost gone then the wife ran the dishwasher - WREAK!

Are the bathrooms back-to-back? Are the bathrooms clustered close to the kitchen or a room or two away? A floor plan of how your rooms are laid out would be helpful.

Seems that the smell is getting into the double walls and propagating between rooms. Does your home have all ceilings (not open beam)? If so, does the attic smell?

Your picture seems to indicate foam sealing the drain pipe at the wall. Is that correct?

Just trying to gather info that might be helpful to everyone,
HRG
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Old 05-25-2012, 06:12 PM   #11
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Are the bathrooms back-to-back?
NO

Are the bathrooms clustered close to the kitchen or a room or two away?

Two on 2nd floor just above one 10 ft away on the ground floor

A floor plan of how your rooms are laid out would be helpful.
See below
The 4 red circles indicate vents on roof
The smell is coming from the corner (blue box)

Seems that the smell is getting into the double walls and propagating between rooms. Does your home have all ceilings (not open beam)?

Yes all ceilings

If so, does the attic smell?

NO

Your picture seems to indicate foam sealing the drain pipe at the wall. Is that correct?

YES, I had a peek a boo mouse a few years back

Just trying to gather info that might be helpful to everyone,
HRG
Also the city has have numerous sewer trucks pumping the sewers so it may actually NOT be my house.
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Old 05-25-2012, 06:43 PM   #12
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Sewer Gas Smell


Quote:
Originally Posted by cabreco View Post
Also the city has have numerous sewer trucks pumping the sewers so it may actually NOT be my house.
Thanks for posting your nice floor plan. Summarizing again:

1. Smell from a cabinet in the kitchen where the main vent runs but not in kitchen sink cabinet.
2 The smell is present in the cabinets of all bathroom sinks
3. I don't smell anything from the drain openings
4. Never had smell in 5 years.
5. All P-traps.
6. Raining pretty bad for last 2-3 days.
7. The smell was almost gone then the wife ran the dishwasher - WREAK!
8. All pipe openings in bathroom cabinets sealed with foam a few years ago to prevent a mouse from getting into the double walls.

Question: Did running the dishwasher produce the smell only in the kitchen cabinet? Or also in the bathroom cabinets too?

Since all of the openings into the double walls were sealed per step-8, the smell can't be coming from the double walls. Looking at your floor plan and your comments, I can't think of anything. Hopefully, someone will think of a cause.

HRG

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