Aluminum cans are typically lined with plastic.

But it doesn't get released as easily. I've read a few weeks ago a thread on an ultralight backpacking forum where they were discussing cooking in beer can. They were pulling spec docs and Lab tests of how much plastic gets released if they cook in those cans. The results was that they release about 0.01% of FDA limit. So, according to ultralight backpackers on that forum, it should be safe.

I'm not really sure how much glass or aluminum containers would matter to the fundamental point?

The plant that purifies the water and puts it into the glass and aluminum containers almost certainly uses plastic or rubber tubing in its machinery. So you'd likely get some plastic particles transferred there as well. In the end, I'd be willing to bet that tap water has fewer micro plastics than water bottled in glass or aluminum.

Problem, of course, is that your municipality likely uses some form of metal piping to get water to your tap. Which, depending on what all that is, could mean elevated lead levels etc.

It's a tough problem.

In a similar vein, does anyone know of any conclusive studies on the safety of PEX plumbing wrt releasing microplastics into our drinking water. My home is primarily PEX. It would be nice to know if I'm slowly poisoning my family.

> Problem, of course, is that your municipality likely uses some form of metal piping to get water to your tap. Which, depending on what all that is, could mean elevated lead levels etc.

Not a metallurgist, but I am pretty sure there are metal alloys that do not contain lead.