Viega. Zero Lead fittings comply with California and Vermont legislation, in effect as of Jan. 1, 2010, that limits lead content of plumbing fixtures and fittings to a maximum weighted average of 0.25%. The majority of the manufacturer’s potable water products already met the regulations; the remaining one-third now feature a zero-lead alloy that contains less than 0.25% lead and is resistant to corrosion and dezincification. 877.843.4262.