Hi All,
I'm new to this board and hope this makes sense.

I live in a newer house (7 years old). There is a toilet in the basement. When it is windy outside, there is a septic smell coming from that toilet area.

This toilet drains into an ejector pump that goes out to the septic tank.
It is the only toilet that does that.

Can I put a 180 deg elbow on the vent pipe on the roof?
Any other ideas?

Thanks you

Have you isolated the smell to just the commode area or do you smell it in other places in the basement? It could be coming from your sump pump, they are very bad about leaking sewer gas around the lid on the tank.
You mentioned a 180 degree bend on the roof, I don't think that would solve any of your problem. There are times when the wind will whip the wind around into certain places and that could be gettng into your basement. A solution to that might be to raise the vent on the roof by two foot or so to get it up in the air further and maybe the smell would be blown away. Hope you find the problem.

The house is a two story house so the roof vent is far away from the basement. I don't think that raising it would help.
I did caulk around the sump cover thinking that might help. There was not an improvement.

Sounds like you're experiencing a backdraft that blows the sewer gas right back archa. You have options. You can install a vent cap, (see image above) or you can check out the Odor Hog at; odorhog.com

There is a new cap for the sewer stack vent at Johnnycap.com it just slides over the pive and attaches with on screm. It looks nice and works great. Jim

There is a new cap out for the sewer stack vent, it is called the Johnnycap and can be seen at Johnnycap.com it works great and simply slides over your pipe and is attached with one screw. Jim