I just bought a house with updated plumbing. When the bathroom toilet is
flushed a gurgling sound comes out of the drain the the bathroom sink
followed by sewage ordor. What can I do to fix this problem?
You have a vent problem. Or lack there of. Is the sink in the same bathroom?
Is it a new bathroom? I am assuming it is.
It sounds to me like there is not a vent for that bathroom so the toilet is
using the sink as its vent. If possible you should contact the plumber that
did the work and get them to fix it, but it is likely that the plumber was
the homeowner or a handy type man, not a plumber. There are other
possibilities, but more information is needed.
The above is the opinion of the author only and not his spouse,
IDale, I inspected the house in early June. at that time the plumbing
The realtor told me he had a plumber come in and they roto-rotered the
drains. Now the drains are operating well, except for the gurgling noise in
the bathroom sink. I believe the plumbing was updatged in the 70s. The
exposed copper plumbing in the basement appears to by professionally done.
Dale, the basement bathroom is directly below the bathroom w/ the gurgling
problem. I looked for a vent stack,, but could only see a vent stack
coming out of the house right above the left side of the kitchen (bathrooms
are on the right side of the house), which is in the rear of the house.
Remembered my neighbor is a 84 y/o plumber who goes to work every day. He's
a friendly guy who has lived in his house for 50-60 years. When they rotor
routered the drains could they have somehow clogged the vent? The previous
owner of the home had warranties with the maintenance company that did the
plumbing work. Tomorrow I'm going too try to get in touch with them.
I want to thank everybody for their help and direction, especially Dale,
Pmartin and Paul W. I didn't have time to respond to pmartin this evening.
Will reply tomorrow.
I'm in the UK and the codes are different over here, but I'm glad my
explaination of what may be happening helped.
Make sure you let us know how you get on.
This is definitely due to inadequate venting. If it's a single story house,
look to see if there is a vent thru the roof above the affected bath group.
If there is a vent, check to see if there is an obstruction. It is possible
an animal went in there got stuck and died. Or, someone could have
intentionally clogged the vent. People do weird things. Once I went on a
service call to a house with drainage problems an found a tenant had stuffed
potatoes into the drains & vents because he was mad at the landlord. Since
you just bought this place, who knows what happened prior to you buying it.
You can run a garden hose into the vent to see if it flows thru or backs up.
If there is no vent, some method of venting would be required to solve the
problem. If there is no way to add a proper vent, the last resort would be
install an in-line, or so called "mechanical", vent to the drainage system.
These are prohibited by code in most states but sometimes there is no other
alternative when correct venting is not possible.
More info would help in giving more advice.
Please see prfvious reply to Dale. When I inspected the house originally
no noise was emitted by the sink drain when the toilet was flushed.
After cleaning the drains to imnprove outflow the noise appeared.
Please ask more questions and I'll answer them.
Now the drains have been cleared the water is flowing freely (probably
faster than before) so if there is inadequate venting upstream of the
toilet, a vacuum is being created behind the mass of water moving down the
pipe. This vacuum is sucking the water out of the "u" bend in the sink (i.e.
the gurggling noise) and then you get the smell of drains due to there being
no water in the "u" bend of the sink.
As has been previously mentioned, you have inadequate venting in the stack
pipe upstream of the toilet.
The reason you didn't get this before was because the drains were partially
blocked the water did not drain so fast and so did not create such a big
Hope this helps.
Updated Plumbing, the realter said so...Check the slope, if it looks
like a 45 degree angle get it done right. That also removes the Trap
Seal allowing Gas in. Is it a P Trap or a S Trap ? S Traps removes the
Seal. 1/4'' slope is all you need and check how
far is the P is from the Wall. If it goes into the floor its an S Trap.
Where is your Vent in distance from the Trap ? Do you have a Vent ? Is
it the proper size ? Is the Tub with a Shower, if so is it a 2" Trap ?
I like to make things easy.....Never trust a Realter sue him for payment,
its the Law. Small Claims then put a lean on his property.
But, in 1970 they often had good Plumpers....
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.