F’ing Septic Tanks

Plugged drain field. Leaking household plumbing. The effluent does not have time to process. You need a consult with a highly qualified licensed septic system installer. This sounds like a big problem to me. I have had four homes with septic/drainfield systems and not had to replace a drainfield yet. I pump mine every five years and put an additive in once a month to help the bacteria work properly.
Good luck, your issues are not fun to have and I hope you get it corrected!