This happened here once, the ground was saturated, then froze, just some weird wet cold weather that year, no trees near the system, just over saturated soil, frost, and soil percolates well here too. I had it pumped out, it's an over sized tank and system designed for much more capacity than it gets, so that helps, and it made enough space to get through til spring thaw, also the washer discharge as all other gray water goes to a seperate drywell tank no lint to clog the leach field or chemical to disturb the septic tank bacteria. Worst case is getting it pumped out to create some space, replacing the leach field from the D box is not difficult, cost effective to rent a hoe and get the stone,pipe and rosin paper or whatever is specified for your area. I'd hate to have to do it now with the frost in the ground, that would be a mess to deal with. The pressure washer cleanout rig sounds like a way to deal with clearing it out, might just be the ground conditions once things thaw, might go back to normal. Only other thing,is to make sure the discharge pipe from the house to tank is not restricted and from the tank to the D box, happened here once, somthing hung up on the pipe to the tank, backed er up though, snaked it out and had tank pumped out too, heard the waterfall, been good since.
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