A licecend plumber will be along soon---
In the mean time---If the house lines are flowing into the septic tank---
Did every thing work well right after the pumper truck left? Then start backing up after enough water flowed to refill the septic tank?
If so---here are some of the usual suspects---
Leach field flooded---Have you had an unusual amount of rain?
Leach field branch lines collapsed----Any body drive over the field recently?
Leach field failed
Septic tank baffles or exit pipe corroded and need attention
I own a house on septic---but I don't do service on them---a plumber will be along soon---Mike----
New members: Adding your location to your profile helps in many ways.--M--