FWIW dept, here in Florida, the need for a mound is due to the water table being close to the surface. The health dept wants the effluent to perk thru several feet of soil prior to entering the ground water and in the event of an unusual high water table during heavy rains, the system would not back up on the homeowner. In my opinion it is an over reaction on the states part but thats another story. The reasons for a mound there may be different. I have two mounds, one that has lasted twenty years and when tested by boring about ten years ago, the effluent had not traveled further than half way the perk pipes. Although not real attractive to have in ones yard, grass planted on the mound (no plants that could cause root intrusion) and kept up as in a normal lawn can make it more appealing. Both of my mounds are within spittin' distance of my homes, one is in a pasture (no fence on that side of house, and the other is new and is within the confines of back yard. In these flatlander areas, one must either build home foundation elevation high enough to get the gravitational flow to the septic tank and then to the drain field, or in my case, put in an additonal tank/lift station and the effluent is pumped as it fills to a certain level into the actual drain field. My system allows for the perk pipes (length and numbers to be determined by sf of house) to be placed essentially on the top of the existing grade, topped by i believe 18" of fill. I am on my local zoning/adjustment board and would never allow a variance of setback for this kind of thing. Invlovement of the county/govt officals would be the best way to have the situation corrected. As far as PO'ig my neighbor off, what kind of neighbor would do this to you? I wouldnt want to be friends with a neighbor with that kind of attitude.