Actually, I just realized that I now have a means of easily, safely, non- invasively measuring how much current is on my two existing AC service entrance ground rods now, my UT210E clamp meter.
(But I don't mean connecting it to neutral. I just mean measuring if anything is flowing in the existing electrician installed thick copper wires between the ground rods and the house grounding connection at the two entry points, by induction to the clamp meter.)
I have no idea how much current is on them, it may be nothing, it may be something. The UT-210E can measure up to 200 amps. Not too shabby. Hopefully there is nothing even remotely near that there.
We had the two 8 foot ground rods put in to bring our electric service up to date a number of years ago. One is at the electric meter, the other is on the CATV cable.
Will do it after breakfast.
For amateur radio or an application like that, where you know when it will be used, it’s not uncommon to simply go out and piss on the ground rod/s.
Don't, you could end up as the subject of one of those "Oddly Enough" stories one reads in the paper.