Any electric current traveling throught the ground wire will accelerate the corrosion of lead in the pipes. Most well and city water does not usually contain lead. Water can pick up lead inside the home from household plumbing that is made with lead materials. The only way to know if there is lead in drinking water is to have it tested. Contact the local health department or the water supplier to find out how to get the water tested.
Scientific data indicate that the newer the home, the greater the risk of lead contamination.
Lead concentrations decrease as a building ages. This coating insulates the water from the solder. But, during the first five years, before the coating forms, water is in direct contact with the lead. More likely than not, water in buildings less than five years old has high concentrations of lead contamination. If tests show that the lead concentration is your water is higher than 15 ppb, action should be taken to reduce the concentration.