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Lead free is not zero

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The definition has two figures Which is the first finding And the two figures are different With the tighter limit on the solder That asymmetry is worth noticing The third finding is the averaging So a small high-lead part can sit inside a compliant assembly And a large component cannot The wetted surface is the subject Which is why this group's leaf list matters While a pipe clip and a push fit clip are not wetted at all So the ten articles divide on a question about water contact And nothing here determines any of it References

A term that reads as an absolute. And is a threshold.

The definition has two figures

For solder and flux, not containing more than 0.2 percent lead. For pipes and fittings, not more than a weighted average of 0.25 percent lead over the wetted surfaces.

Which is the first finding

Lead free is a defined threshold rather than an absence. The words say free and the definition says a percentage.

And the two figures are different

0.2 for solder and flux and 0.25 for the wetted surfaces of pipes and fittings. Not the same number.

With the tighter limit on the solder

Which is the material that joins the system, held to a lower figure than the system itself.

That asymmetry is worth noticing

A joint is a small area and a high-exposure one, and the definition treats it more strictly rather than averaging it away.

The third finding is the averaging

Not more than a WEIGHTED AVERAGE of 0.25 percent, with respect to the wetted surfaces. Not a limit on each component.

So a small high-lead part can sit inside a compliant assembly

Because its contribution is weighted by its share of the wetted area, and a small share contributes little.

And a large component cannot

Which is the same arithmetic in the other direction, and it makes the geometry of an assembly part of the compliance question.

The wetted surface is the subject

Not the part and not its mass. A fitting's outside does not count toward anything.

Which is why this group's leaf list matters

Ten named articles, and a faucet aerator, a valve seat, an o ring, a supply washer and a compression ferrule are all wetted surfaces.

While a pipe clip and a push fit clip are not wetted at all

Which puts them outside the measure entirely, and they are on the same shelf in the same jar.

So the ten articles divide on a question about water contact

Which has nothing to do with their size, their material or how they are stored.

And nothing here determines any of it

Whether any article is lead free, and whether the requirement reaches it, is not established on these pages.

References

42 U.S.C. 300g-6(d), the definition of lead free. For solder and flux, "not containing more than 0.2 percent lead". For pipes and fittings, "not more than a weighted average of 0.25 percent lead when used with respect to the wetted surfaces of pipes, pipe fittings, plumbing fittings, and fixtures." This is a definition from the Safe Drinking Water Act; nothing on these pages describes what the Act prohibits, where it applies, the exemptions, the certification or the effective dates, or determines whether any article is lead free. law.cornell.edu

42 U.S.C. 300g-6(d) applies its 0.25 percent figure as a weighted average with respect to the wetted surfaces of pipes, pipe fittings, plumbing fittings and fixtures. So the measure is area-weighted across the surfaces in contact with water rather than applied to each component or to the mass of an assembly. No computation is performed on these pages for any assembly.

Written from 42 U.S.C. 300g-6(d) and from the catalog as it stood on 19 October 2026. That is a definition from the Safe Drinking Water Act and nothing here describes what the Act prohibits, where it applies, the exemptions, the certification or the effective dates, or determines whether any article is lead free. A weighted average over wetted surfaces is computed for a particular assembly and no computation is performed here. This shelf is shared identically by nine groups and the sewing notions property enumerates the inventory.