Lead is a substance that in very small amounts can cause major health problems, especially in small children.  Corrosion of lead pipes, lead fittings and lead-based solders can introduce measurable amounts of lead into a water system.

Acceptable results:  Less than 15 ppb.

Sources:  Lead can get into water systems (corrosive water) from pipes, lead solder or brass fittings or it can be in water coming from the ground. 

Recommended testing:  Annually if water is considered corrosive or water is in a risk area.