Downstairs Apartment Flooding and Moisture in the Walls

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Limabean
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Q:

I live in the Virgin Islands in a house,downstairs on a hill with a slope. I recently redid the apartment where there were signs of leaking in the walls and certain areas around the apartment. I thought that the contractor took care of it and also put in a sump pump because it has a spring running water under the house. It has been over a year now but it seems like there is moisture back in the walls and the sump pump is running a lot more now. So is there a way to finally take care of this or does it have more to do with the whole house and the structure?