Lead was used for centuries in plumbing because of its pliability and resistance to leaks; in fact, lead’s chemical symbol, Pb, is derived from the Latin word for plumbing. In 1986, the U.S. Congress amended the Safe Drinking Water Act to prohibit the use of pipes, solder or flux that were not “lead free.” At the time “lead free” was defined as solder and flux with no more than 0.2% lead and pipes with no more than 8%. In 2014, the maximum allowable lead content was reduced from not more than 8% to not more than a weighted average of 0.25% of the wetted surface of pipes, pipe fittings, plumbing fittings, and fixtures.