In accordance with the Safe Drinking Water Act is a backflow preventer, such as this pressure vacuum breaker (that contains lead), required to be lead-free? I am confused by section 300g-6 which prohibits the use of non lead-free fixtures in "any public water system". Does this mean it must be completely isolated from the public water system, or just that no downstream system can be used for human consumption?
Relevant text from the Safe Drinking Water Act:
§ 300g–6. Prohibition on use of lead pipes, solder, and flux
a) In general
(A) In general
No person may use any pipe, any pipe or plumbing fitting or fixture, any solder, or any flux, after June 19, 1986, in the installation or repair of—
(i) any public water system; or
(ii) any plumbing in a residential or nonresidential facility providing water for human consumption
that is not lead free (within the meaning of subsection (d) of this section).