To help narrow down where the leak may be, make sure there is water in your fresh water tank, disconnect the city water and turn on the water pump. If it still leaks, evidenced by the continuous cycling of the pump when no water is in use, then it isnt just city water. It could be the water line to the toilet or other fixture which should be accessible through a compartment or panel.
If you don't feel confident doing this yourself I would highly recommend turning off the water and getting it repaired ASAP to prevent further hidden damage.
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