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I had a similar problem. Plumber working in house and valves wouldn't hold so he could solder. He loosend the nut on the water meter to let the water drip and disrupted the ground clamp and got an arc and sparks.

Amprobe around the water pipe showed amps...loose neutral by POCO current going back to the transformer through the earth.

Even with the service shut off current went down but not completely gone. Suspect POCO had loose neutrals on other houses nearby and they were called to make repairs.

If your closer to the transformer you get the stray current
 
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