Water Supply & DistributionQuestion 49 of 120
What is the maximum lead content permitted in solder and flux used on a potable water piping system?
a.0.2 percent
b.0.25 percent
c.2 percent
d.8 percent
Explanation
Solder and flux used in potable water piping may not exceed 0.2 percent lead, which is why 50/50 tin-lead solder is prohibited. The 0.25 percent figure is a different limit, the weighted average lead content allowed on the wetted surfaces of pipe, fittings, and fixtures. The 2 percent and 8 percent values are far above any lead-free standard and describe legacy alloys no longer permitted.
Law Reference: UPC §604.0Practice all 120 questions free — no signup required.
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