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Old 02-17-2018, 07:13 AM   #1
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Bad Smell


In our master bathroom, first thing in the morning generally, when we run the water, there is a sewer gas smell which disappears shortly. If I close the drain and run the water, no smell, so it's not our well water.

I cleaned the trap and tried running a snake but there are too many bends and the skink drains properly, as do the shower and toilet that use the same main line and vent stack. The shower and toilet don't seem to have the odor.

I went up on the roof and snaked the vent stack, it came out wet but with nothing caught on the end.

Any ideas? I was thinking of dropping some drain cleaner stuff down the stack to see if that would help. Bad idea?

I know if I call a plumber out it will cost a ton and only take 5 minutes which will **** me off. LOL.

I am pretty handy but this has me stumped.

Thanks

Bryant
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Old 02-17-2018, 07:20 AM   #2
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Re: Bad Smell


Do your sinks incorporate S traps or P traps?
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Old 02-17-2018, 07:39 AM   #3
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Re: Bad Smell


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Originally Posted by chandler48 View Post
Do your sinks incorporate S traps or P traps?
It is a "p" trap.
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Old 02-17-2018, 07:41 AM   #4
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Re: Bad Smell


Bad idea on the drain cleaner if someone eventually has to pull things apart.

Can I assume this isn't a new home with a problem right from the start. If this is a new problem in an existing home then something has changed. Have you done any work, construction or plumbing, anything?

Do you have a basement with access to the plumbing below this bathroom? Or is this a second floor bathroom?

You said "first thing in the morning generally, when we run the water, there is a sewer gas smell which disappears shortly"
Is the bathroom the first water you turn on?
When you say "disappears shortly" then further use of that sink is no longer generating the small??
Is it when the hot water is used or the cold water? A hot water tank can produce a sewer smell. Google this: "can a hot water tank produce a sewer smell"

Bud
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Old 02-17-2018, 07:58 AM   #5
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Re: Bad Smell


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Bad idea on the drain cleaner if someone eventually has to pull things apart.

If, I used this, I would flush it completely with a garden hose down the vent stack.

Can I assume this isn't a new home with a problem right from the start. If this is a new problem in an existing home then something has changed. Have you done any work, construction or plumbing, anything?

21 year old home. New roof but the smell was there prior. Started a year of so ago.

Do you have a basement with access to the plumbing below this bathroom? Or is this a second floor bathroom?

Full basement underneath, no leaks, all drain pipes slope down properly.

You said "first thing in the morning generally, when we run the water, there is a sewer gas smell which disappears shortly"
Is the bathroom the first water you turn on?

Generally, yes, but no other faucet/sink generates the odor. The Master is has it's own vent stack.

When you say "disappears shortly" then further use of that sink is no longer generating the small??

If not used all day, the smell will normally occur again.

Is it when the hot water is used or the cold water? A hot water tank can produce a sewer smell. Google this: "can a hot water tank produce a sewer smell"

Understand, but if I close the drain and run hot or cold, no odor is detected. That is why I believe it's the drain.

Bud
Replies in red for clarity.

Last edited by In Virginia; 02-17-2018 at 08:07 AM.
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Old 02-17-2018, 08:05 AM   #6
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Re: Bad Smell


Sorry for all of the questions but we need to gather info when troubleshooting long distance. Many are usually following and waiting for a bell to ring. Still thinking.

Thank,
Bud
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Old 02-17-2018, 08:09 AM   #7
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Re: Bad Smell


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Sorry for all of the questions but we need to gather info when troubleshooting long distance. Many are usually following and waiting for a bell to ring. Still thinking.

Thank,
Bud
No bother at all, the help is appreciated.
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Old 02-17-2018, 08:12 AM   #8
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Re: Bad Smell


Bathroom sinks may also have an overflow that leads into an internal area between the sink you can clean and the outside. this internal area can become a source on nasty smells.
Another Google with many hits "can the overflow for a sink be the source of a sewer smell"

Bud
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Old 02-17-2018, 08:28 AM   #9
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Re: Bad Smell


Quote:
Originally Posted by Bud9051 View Post
Sorry for all of the questions but we need to gather info when troubleshooting long distance. Many are usually following and waiting for a bell to ring. Still thinking.

Thank,
Bud
This guy is talkin long distance bout me again.
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Old 02-17-2018, 08:29 AM   #10
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Re: Bad Smell


OK, a bell rang.

Have you checked the P trap for adequate water supply ?
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Old 02-17-2018, 08:40 AM   #11
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Re: Bad Smell


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Originally Posted by SeniorSitizen View Post
OK, a bell rang.

Have you checked the P trap for adequate water supply ?
Not sure how to determine "adequate supply" but there is water in it when I remove it. It seems to be full.
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Old 02-17-2018, 08:57 AM   #12
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Re: Bad Smell


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Originally Posted by In Virginia View Post
Not sure how to determine "adequate supply" but there is water in it when I remove it. It seems to be full.
It's most likely OK if it seems full.

If you want to check, remove the trap while holding a container under it and emptying the trap contents into the container. When the container water is poured back into the trap it should fill it to approximately the low side of the trap.

Does the lavatory have an overflow ?
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Old 02-17-2018, 09:14 AM   #13
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Re: Bad Smell


Quote:
Originally Posted by SeniorSitizen View Post
It's most likely OK if it seems full.

If you want to check, remove the trap while holding a container under it and emptying the trap contents into the container. When the container water is poured back into the trap it should fill it to approximately the low side of the trap.

Does the lavatory have an overflow ?
Yes, there is an overflow, I had filled the sink to capacity and the overflow seemed a bit slow so I injected some drain cleaner into it. I will see if that does any good.

When I fill the sink and then open the drain, there seems to be a gurgling sound as thought the vent stack is partially clogged or filled with water. Unfortunately, there is no way to check it's slope without cutting the sheetrock in my living room wall.
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Old 02-17-2018, 09:36 AM   #14
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Re: Bad Smell


stop up sink and run cold water fully open until sink has depth of ~ 2-3"
leave water running fully open and time how long it takes for standing water
to drain while cold water continues to run... if it takes more than 10-15 seconds
for the standing water to drain, or worse never drains or rises,
there is a build up in your drain for lavatory...
it may be that the popup assembly before the trap is clogged
this ties in with the overflow and both are located above the trap
if popup assembly is clogged, you should pour a 25/75 mixture
of Clorox & water through overflow with funnel

Peace
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Old 02-17-2018, 09:53 AM   #15
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Re: Bad Smell


Quote:
Originally Posted by DR P View Post
stop up sink and run cold water fully open until sink has depth of ~ 2-3"
leave water running fully open and time how long it takes for standing water
to drain while cold water continues to run... if it takes more than 10-15 seconds
for the standing water to drain, or worse never drains or rises,
there is a build up in your drain for lavatory...
it may be that the popup assembly before the trap is clogged
this ties in with the overflow and both are located above the trap
if popup assembly is clogged, you should pour a 25/75 mixture
of Clorox & water through overflow with funnel

Peace
The sink drains fine, popup is clean, trap is clean and now the overflow is clean. I will wait a few hours and check for odor.
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