Use a voltmeter on ac volts. Put one probe the ground terminal of a wall plug or extension ford that is grounded (the round terminal on the wall plug) and put the other probe of the voltmeter in the water. If it shows voltage that disappears when you unplug the skimmer, then its the pump. make sure you get good contact on the plugs ground slot, it can be tricky as there isn't metal contacts all the way around the hole.
Please don't fix the problem with a ground probe. I'm going to get flack for saying this bit a ground probe is just a bandaid to a bigger problem. It takes stray voltage and turns it into current through the water.
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