Like most other things in California, it is a political decision, not a rational one. You could grind an entire CSV into powder and dissolve it into the amount of water it would pass over it's lifetime, and I would let my grand kids drink it all day long everyday of their lives. In reality there might be a teaspoon worth of material wash off that valve over it's life span. That prop 65 thing the Californians started is costing the entire world billions of dollars. They actually have to grind up small parts from our valves into powder and dissolve it in acid to see what the components are made of. None of that material comes off the valve and gets into the water under normal use.
The CSV3B is NSF372, which means no lead. But they won't give us the NSF61G because the rubber diaphragm has some Sulfur in it. Again, lead, Sulfur, or anything else the valve is made of does not get ground down and dissolved into the water under any condition.
Our grand parents lived to be 90-100 years old drinking water from pure leaded brass pumps, and even solid lead pipes like in Flint Michigan. Lead is an important part of many metals, and they are inferior without the lead in them. Even the solid lead pipe in Flint was never a problem for 100 years until some government employee decided to change the water supply to an acidic source. The acidic water dissolved the patina on the lead pipes, and it was actually the lead oxidized patina that caused the problems, not the lead pipes. The only thing those NSF certifications did was to make the company NSF rich, and to reduce the quality and increase the price of everything the American pubic purchases.
