Noooooo! Do not bury your septic lines deeper than designed, at least without talking to your installer first. Regrading a few inches to prevent runoff pooling on top of the field is one thing, burying the lines an extra couple feet can prevent your field working properly.Yeah its definitely a few factors. Our water table is HIGH. We are less than a mile from a lake. In the summer though, there are no issues with our leech field. Right now, with all the rain and everything it is much more soggy there. We're planning on basically adding a foot or 2 of dirt over the entire area. We aren't in a normal neighborhood and so the ground is super uneven out here. We replaced and rerouted the lateral line with PVC.