Sounds like you have a leak between the pump and fresh water tank.
The good news is this "should" be just a short run from the tank to the pump, as hopefully the pump is adjacent to the tank.
The city water connection should be on the discharge side of the pump, and the tank should be on the inlet side... assuming the plumbing is conventional.
At some point though, you should be seeing wet areas, either inside or on the ground (hopefully) where the water is leaking.
But it is something you need to get fixed right away as you could eventually have severe water damage.
Good luck.
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