Having been in the excavation business a better part of my life, Scott I have to disagree with your thinking on septic testing. Testing a septic system involves alot more than the septic tank...which hardly or never fail. Your main concern on a septic test are the lines and most importantly the leach field...NOTE... the only way to test a septic system is with dye...opening a tank and pumping will tell you nothing...after pumping you still need to perform a dye test. Its the only way you can detect failure of the system.