At what point is something considered native land?

Question

20 years ago I put in a small fill of land about 20 ft by 16 feet (4 ft high) for an above the ground septic. I am trying to see if I put this in know if it will be considered a below the ground septic. I need help please. thank you. any help will help. (state is ny if that helps)

Answer 1

It's hard to understand what you are asking. Perhaps you can repost this with more details.