"Brass is an alloy of copper and zinc" https://en.wikipedia.org/wiki/Brass https://en.wikipedia.org/wiki/Brass Plumbing brass has traditionally contained high

"Brass is an alloy of copper and zinc" https://en.wikipedia.org/wiki/Brass https://en.wikipedia.org/wiki/Brass Plumbing brass has traditionally contained high levels of lead, but it's not supposed to anymore, except for things intended for non-drinking-water purposes, which unfortunately includes outdoor water spigots. I wouldn't be shocked in doorknobs had lead in them beyond trace amounts, but it isn't guaranteed.