who does leveling groung service for above ground pool in bergen county NJ?

Hi, welcome to TFP! I don't know a specific company to level the ground in your area, but you might try contacting some landscape companies and see if they will prepare a level site for you.
 
Not sure if he does pools leveling or not (I would think he does) but Ron Chase & Son Contracting out of Leonia has a very good reputation. I never used them, but I used to live in Leonia - very nice family, great reputation, and very involved in the community and well known.
 
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