THD on AC mains--what level is typical?


My power conditioner has a display that according to the manual shows the % of total harmonic distortion in the AC that's going into the unit.  So far I've seen values from 1.20 to 1.40.  Is there any range that can be thought of as typical of THD on AC supplies?
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My PS Audio P-10's both report ~3.8% in my neck of the woods, typically (middle of a 3+MM population metro area).  The regenerators do make that sound better once they are done reconstructing the signal.