"Molly Brown" wrote in message
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I saw what looked like a septic tank cover right next to this very
expensive house built on a slab foundation. The house is on a hill and
the ground falls off right after where this cover is so the only place
the septic tank could possibly be, I would assume, is under the house.
Is this possible?

If the house has a septic system, it will also need septic fields, so it's
more likely that what you are looking at is something else