Welcome to the future @Dirt_Diggler!
Heavy metals are more likely to come from contaminated soil, whether grown organically or not. Good organic inputs can be found without heavy metal contamination, but I’m sure plenty of organic materials could contain heavy metals, too. Some things like Azomite have been debated for heavy metal content, but even the cleanest hydro nutrients can contain traces of heavy metals, too.
Check out this post from @AgTonik:
The pdf he uploaded has some great info on the topic as well.
Edit: That whole thread would be a good read regarding heavy metals.