[LIforrelaxin]

Lots of interesting replies here... All of which is good information... Bottom line is one should go into work on a septic system with open eyes. Once you get to the point, where a tank needs to be replaced, unless the entire system was recently new, you are probably in for a complete evaluation, of the leach field etc. I know my camps system was put in place in the 70s, I have a concrete 1000 gallon tank, and what at the time of installation a legal leach field. However by today's codes and regulations, Along with a Tank I would have to replace the leach field, as it is not up to code.

Once you start talking about tank replacement, I believe every town will require a permit be pulled, and I would hate to think about what the cost of getting caught with out a permit would be.... Once that Permit is pulled, you have to do what ever the local inspector is going to require....