F’ing Septic Tanks

I live in a rural area on a horseshoe shaped road. Every house on the inside of the U needs it’s septic redone before selling. Luckily I live on the outside of the U on two acres with farmland all around. My house was built in 1974 and the tank was never emptied when I bout it in 1985. To this day it’s still never been emptied. I don’t even know where the tank and leachbed is as I have a nice downhill grade. The inside houses only have 45-50 feet to the road.