I have a horrible odor coming from the house trap. What could be the cause and what
Can I do to correct it?

Thank you for any suggestions.

What fixture trap are you referring to?

It is in right before the pipe exits the house into the cesspools outside. That is where the plumber goes to snake.

I'm confused, Are you referring to a running trap in the sewer line or the cleanout the plumber has to open up to snake out the line? Cheers, Tom