AB1953 is the California state-level legislation act that was created in 2006, and became effective in January 2010. It essentially prohibits any materials that handle potable water from containing more than .25% of lead. It makes no distinction between commercial and residential applications. There are unique rules associated with that measurement, along with applicable methods. A copy of this act is available from our office. It is notable that the state of Vermont duplicated the requirement and placed it in force also in 2010. Maryland followed in 2012. A copy of this act is available from our office