We planted a kumquat free over our 70 year old leach field. Its below ground and we were unaware until just recently that it was indeed the drain field. We did not find any indications of it when we planted it. I have looked online but have found contradicting information. I talked to a women at Halls nursery and she said it should be fine to eat the fruit but again and I am unsure. Does anyone have in info they could share on the subject ? Would it be worth it to try and move the tree? Thank you for reading .