You shouldn't run into footings unless there is a supporting wall, or post there. Not sure on the building codes there so couldn't tell you what you may run into for width. Generally here, if I remember right they would be 12-24" wide for wall and 1' to 3' square for posts depending on area code...
You can get pre-made plastic sump pits to install (cement in) after you knock out the concrete.
The water can very well have come up through any floor openings whenever the ground underneath reaches saturation.
Putting in a pit and having a sump there as a back-up for when drainage gets...
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