A recent reader letter triggered a reminder on the importance of addressing venting and odor issues. A homeowner from Wisconsin wrote complaining about sewage odors both inside and outside the house. He explained they live on top of a hill, which is always windy, indicated by the lack of mosquitoes in the summer. (Only people in upper Michigan, Wisconsin and Minnesota understand the full significance of this.) He also explained their onsite system includes a septic tank and drainfield trenches fed by gravity — so a conventional system.In a typical setup like this, the drainfield and septic tank vent back
