I have a strange smell (somewhat like decomp but its not) that has presented its self every August since 2009 and stays for 14 days. It comes on strong the second day and stays the same smell level for 12-13 days and goes away until the next year. I have had the plumbing inspected twice with a camera and 2 pest control companies that say its not rodents. I have bored holes in walls and used video scope to inspect inside walls looking for any signs of pests and have found nothing. The house is 2 story built in 2007 on concrete slab with no drainage issues around the house.

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    Any area in the house where it is the strongest? – diceless Sep 18 '14 at 15:37
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    What kind of climate is the house located in? What season is it in August? – wallyk Sep 18 '14 at 16:02
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    Including your location might be important here, as it could be caused by an indigenous animal or plant. For example, some areas are plagued by stink bugs, who release a pungent aroma when threatened. – Tester101 Sep 18 '14 at 16:09
  • NE Atlanta Metro – JED Sep 18 '14 at 18:19
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    Check with neighbors, see if any have similar issues. Nothing so far screams out, you must check this as you have already checked all the common areas. – diceless Sep 18 '14 at 21:27

Could there be a hidden floor drain in the area? It wouldn't explain why the timing is so regular, but it might be connected to something that does. I've dealt with a similar come-and-go odor problem in a commercial buidling that ended up being a 4 inch open floor drain that was just carpeted over when the building was turned into offices. That drain line connected into a drainage system that was tied to a nearby building that housed a chicken processing operation. You can imagine what sorts of things were washed down their pipes. It typically only smelled during the dry season, I suppose because some elbow trap between us and the odor dried out.

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  • Thank you for contributing your experience with this vexing and annoying problem! – wallyk Sep 19 '14 at 5:06

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