Try taping foil to the walls in the basement in several spots and wait to see whether any condensation appears. If the water is trapped between the wall and foil, then it is coming through from the outside. If there is condensation on the outside of the foil, then the moisture is from air leaks or high humidity in the house.
This is a low cost place to start you on the road to figuring out what is wrong and what you'll need to do to fix the problem.
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