The risk of source water contamination is becoming increasingly prevalent!
Lead (Pb) contamination
Your household plumbing may be the cause for lead in your drinking water. In older homes, lead was used to make the piping and/or solder. In homes, built prior to 1930’s water pipes were primarily made from lead. These pipes can be identified because the piping tends to have a dull gray color, can be scratched with a key, and a magnet will not stick to the piping. In buildings built between the 1930’s and early 1980’s, copper pipes were often used, but the solder contained elevated levels of lead.
This does not mean that a newer home is safe from lead contamination; in fact, the available data suggests that buildings less than 5 years old can have high levels of lead. In fact, buildings built prior to 1986 likely contain some lead plumbing. Prior to 2014, the legal definition for "lead free" was plumbing fixtures with a lead content of less than 8 %. In 2014, the term was redefined to include only fixtures with a lead content of 0.25% and newly installed fixtures must use the "lead free" materials, but this did not apply to fixtures currently in use.
People with lead water distribution pipes are at risk.
The primary route for lead poisoning in drinking water is not old contamination of the water by leaded fuels, old batteries or some hazardous waste site, the primary route is the water distribution system used to carry water to your home and more importantly the plumbing within your home.