The odor is associated with venting problems. Fill all snks, tubs, etc. with water. Next flush all toilets and drain all sinks, tubs at the same time. Go outside and downstairs to see if odor is present. Install sweetfilters on roof vent stacks and repeat steps above. If odor is gone you have found the culprit. If odor is still present or gets worse remove the sweetfilters for 100% refund.
: In our new home we've had a sewer gas odor in the
: downstairs bathroom since we moved in a year ago.
: The smell only occurs during and after it rains or
: snows. Our builder, inspector, and septic tank installer are all scratching their heads. Is it safe
: to breathe the odor and will it ever go away?