Perhaps what needs to happen is engineers developing a cheap rapid test where it becomes possible for consumers to become aware enough of the invisible problem that it becomes possible to advocate for a solution.
At the moment, we are left fighting ghosts, some of which may not be real. How are we to hold cities responsible for their water when it's possible they are part of the good 50% as far as we know?
What if the bottled water we buy to avoid pfas has higher concentrations than the tap? We are powerless to even hold manufacturers responsible.