I have a question about the odors that come out of the vent pipe
of a septic system.
I have a house that has a septic system. I had the
septic tank pumped out two years ago when I first moved in. I have
noticed that on some days, there is a slight sewage smell on the front of
the house after a shower/flush/wash cycle. I have determined that the
smell does not come from the septic tank or the drain field directly, but
rather from the gases coming out of the vent pipe on the roof. These gases
come down the roof to the front of the house. The house is on the
less windy side of a mountain and is surrounded by trees.
My question is: Is this smell normal, or is it a sign of a problem with
the septic tank? Looking around the web, I have found articles that say
there shouldn't be an odor coming from the vent pipe, and other articles
which say the smellis normal and can be minimized with a filter.
Thanks for any advice.
The ventilator for your house's internal sewage
pipes is called the Stack Vent. When working
right, sewer gases move up in the atmosphere
and you do not smell them. Certain weather
conditions prevent this, so that the smell travels
down to ground level.
1. This happens at this address about once a
year for 2 to 7 days in winter.
2. The only cure appears to be an aerodynamic
ventilator atop the stack vent (like factories use,
to spin in the breeze and because of its shape
suck gases out of the pipe.) But no such
ventilator is made to fit stack vent dimensions
(according to the roofers working here last week.)
Carlsbad Springs (Ottawa, Canada)
I replaced my septic tank about three years ago, and suddenly was beset
by septic gasses that would gag a maggot. It became very unpleasant to
be outside in the yard. I tried various biological agents in the
septic, to no good effect. Finally I just poured a gallon of vegetable
oil down the drain to try to scum the surface. I noticed an immediate
reduction in the stench, and this year I haven't smelled it at all.
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