Help! In all my years doing landscaping I have never had to deal with a septic leach field except to know that you can't plant anything except grass over it.... I have a prospective client that, among other projects, wants to level the backyard, including leach field, into a nice backyard. Currently, the area is very "lumpy". The house was new construction a few years ago and was essentially plunked down in the middle of a hay field. Very little finish work was done. What can I do to this area without damaging the field? Can I run a tiller over the area, level and reseed/sod like I would with any other lot? I am assuming that the system is a designed system with underground pipes, but I don't know how deep they would typically be. I asked the homeowner, trying not to sound too ignorant, but they had no idea about the system, other than that was were the leach field was. Any thoughts, or resources I can look for to learn more about them??