Our home is 40 years old with an old cement septic tank buried 3 feet under ground with no modern clean out system. We know approximately where it is but have no idea what kind of top it has. We have never had a problem problem with the whole system in 25 years. The buyers are financing through our current lender and they have never asked for the septic system to be inspected. If they back out on the purchase, we are going to be left with our backyard dug up and part of our fence taken down. Can we ask the buyers to do this after closing? What if pumping the system disturbs the eco system we have established and maintained all these years and they blame us later?