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wrote:

Speedy Jim wrote:

Doesn't sound like venting, as you discovered the vent is clear.
Main line clogged or else the septic field is blocked/waterlogged.
The tank is always full of liquid; that's the way it works.
The spillover goes out to the field.

Jim

Thanks for the reply, Jim. The field is not wet at all and recently my
neighbor had to dig up their field because of roots...they had a
noticeable liquid problem in their case.

So, it must be a clog in the main somewhere. I attempted to get the
cap off the septic tank to try to snake from that end, but I cannot get
the plug out (I need a crowbar). The clog must not be a complete
blockage because lately, the backup has not occurred during flush
tests, but rather if a large amount of water is put through (i.e.,
laundry).

Thanks,
Dave

May have more success with a bigger snake. Rent a sewer auger
at a local rental place. You'll need a cleanout access in/near
the house.

Jim