i don't know anything about tea but i saw stuff about this:

https://well.blogs.nytimes.com/2013/05/23/whats-in-your-green-tea/

i can't tell if it's a credible source or not (it kinda sounds like an advertisement for the tea company) but i don't want to be exposed to lead particularly because i have other hobbies that have potentially exposed me to lead in the past