Yes, a toilet should be installed as close to perfectly level as possible on both the horizontal x-axis and y-axis. Ensuring a level installation prevents uneven structural stress on the vitreous china ceramic base, guarantees proper water distribution inside the bowl during a flush, and ensures that the internal tank water line sits correctly parallel to the rim without touching or spilling into the overflow tube. Verification: Place a standard bubble level across the top of the bowl rim to confirm it is level.
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