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acpguy · C
It all depends on its location. It could be a stub for future septic system, water or septic tank clean out. However if there is a large pipeline nearby it could be test well as there might be wires inside for that purpose or it could be that they installed a deep well anode system if you see a metal box nearby with power to it that would be a possibility. Other things; it might provide a way to test soil / water for bad chemicals or someone stuck it in the ground just to make people wonder why it is there.