Doug Warner wrote:

I was mowing the lawn today, and discovered a very soggy spot. right
where the sepric tank is supposed to be. I did some probing to locate
the tank, then drained a half-full bathtub as a test.
Result: Mini-geysers from some of the holes I made.

Looks like my 21-year-old tank isn't draining. I've never had it
pumped out, since I didn't believe a single user would fill it up.

I have a service company coming out tomorrow to check it out.
Best case:: The tank is full of solids, blocking the outlet.
Worst case: Tree roots (lots of trees) have clogged the field pipes.

Any ideas on what I might expect to pay for either case, a pump-out or
a new leach field.

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probably just a grease clog at the inlet to the tank.