If the septic inspector inspected the wrong tank and the actual septic system is failing, who is responsible?

Question Details: When we bought the house, the seller was required to provide a septic inspection. They did and it said that even though there was no permit, it was fine except for the pump wasn't hooked up to electricity. We put in our repair addendum that they had to fix the electrical, and they did sort of, but they hired a non-electrician contractor who did a botched job, like everything else in our repair addendum that we asked to be fixed Anyway, we paid to drain the tank. Soon after, the plumbing started back up and flooded our home. We then discovered our real septic talk was buried by house, the one that was inspected and drained was a tank that was built to service an RV and though it's fairly new, it was no longer in use. The real tank is super old and failing and hasn't been drained in many years. It would not have passed inspection. The seller had been living in the home for over 20 years, so they definitely knew where their septic tank is and allowed the wrong one built for an RV to be identified by the inept inspector. We cannot understand how the plot plan the septic inspector drew could be so inaccurate. It showed the wrong tank and wrong placement of the drainfield. In our county, if you want to build a new, permitted septic system, it has to match your neighbor's. Our neighbors paid $25,000 for their septic tank. We don't have that kind of money but we could get it fixed under the table for about $1,500. What do we do - sue the seller, sue the septic inspector, eat the cost?

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