More important for health is the grounding practice and whether transformer isolation and single point grounding per transformer winding is violated, making the earth/aquifer a conductor. Much of the world is using the techical abomination of Wye multipoint grounding, with transformer isolation violated (by the "ground tie"). This causes ELF magnetic fields to be 100x higher than necessary. In areas with Delta power and transformer per home, even homes with modest street setbacks and power on poles on the street have background ELF magnetic fields below 0.002 milligaus. It is not uncommon to see home lots above 1 milligaus in Wye served areas. (Solely from neutral current through the earth, with power to the home off.)
Much of world violates basic good engineering practice in the grounding of their power system. Saving a few bucks by allowing the power co. to use the home grounding electrode prompted this move in the US in the 1930's, according to Zipse. According to Zipse, when quizzed, 85% of EE's don't believe that the existing system is possible, since it's such an abortion. I certainly didn't, until seeing a huge magnetic field and measuring 0.1 amps of current flowing to my to-code-grounded well pump, with main power off!