Q.Will Fruit From My Grapefruit Tree Planted Next To A Septic Tank Be Contaminated?
I planted a grapefruit tree several years ago, and it is just beginning to bear fruit. When I had septic tank issues, and it had to be dug to be pumped, I learned my tank is only about six feet from the grapefruit tree. Will bacteria from the septic tank’s contents contaminate the fruit and cause the fruit to be inedible?

Certified GKH Gardening Expert
It is quite possible. Six feet is very close to the septic tank. Here is more information on the subject:
https://ask.extension.org/questions/449374
http://blogs.ifas.ufl.edu/nassauco/2017/07/19/q-far-away-septic-tank-trees-located/