[Mark Henry]

Septic fields only last 30-40 years, some go longer than that depends on use.
My 35year old system went bad 2 years ago. Thieves around here wanted close to $20K for a new system. I found out that the home owner can legally replace their own. So I did the research, rented a mini excavator and bought a old tractor and put a in an infiltrator system. Old bed was 200' of pipe, the infiltrator is roughly twice as efficient and I put in the 200' so I should be good.

My tank was good and up to code I just had to make the modern style outlet. Another thing I did with the tank was add 12" risers with lids, so I no longer had to dig up the tank lids

Not counting the tractor that I wanted, 200' Infilteator, two loads of sand, pipe, tank risers and mini excavator was about $3500.
That't a bit of a guess. The bill was just over $4K but I also installed 400' of water line, two hydrants and electrical out in a field while I had the mini-excavator.