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Complicated question, are you talking about leach field lines?
What do you mean by failing?
I'm not so concerned with the depth as much as proper grade/slope and length, as well as fill dirt composition.
Have you been in contact with the drain field person? The inspector is only responsible for making sure it's up to code. They are not responsible for functionality.
Usually a plumber installs the piping, but some one else designs the field
See link below
It would be very odd for a government agency to design the system. No matter who designed it whether the county or the plumbe THAT person is responsible for its functionality.