We completed a installation inspection and radon test for a relocation company (Kudos to them) on a system that was installed at a vacant property the previous week. See if you can identify why the sump pump would not shut off. (Answer below the picture.)









The shutoff valve (the blue handle) was closed by the tech when they installed the lid. The valve was not reopened after the lid was installed. When the water level rose in the crock, the sump kicked on. The closed valve prevented any water from leaving the crock, so it couldn't shut off.
Best we can tell, the pump continued to operate for approximately 1 week in this condition based on the install date and the last significant rain event.