After doing extensive searching on here and talking with people, I was unable to find any info on whether or not a la peppina that was missing its chrome would leach heavy metals into the coffee.
So I decided to go get the water tested.
It does not appear to meet European safety standards, but not in the way I thought.
*TLDR*: if you have a la peppina with chipped chrome on the parts that touch water, it could be worth testing your water to see if it's leaching lead. (If you care about that sort of thing)
Arsenic, which is what I was most worried about, was at 1.5µg/L compared to the European standard of 10µg/L. So no problems there.
However, lead came in at about 3x the European standard, clocking in at 29µg/L vs the standard of 10µg/L! This is not necessarily so surprising, as lead is indeed listed as a common zamak impurity, and it seems like that's what these machines are made of.
Aluminum is also a over the European standard, but I haven't yet been able to calculate the meaning of what they wrote. (They wrote 2,7e+3 and marked that it was over the standard of 200µg/L, but idk how to calculate that and google didn't help. If you know how to calculate that, please weigh in
It's worth noting that this test was conducted on hot water that I ran through my machine; not on coffee that I actually extracted from it. So in theory, the coffee puck may hold on to some of these metals and stop them from getting into the puck. Hard to say. Maybe I'll extract a liter of espresso and bring that in to them to test.
It's also worth noting that I don't know how my standard tap water clocks in. It could be that my normal tap water is high in lead and that the machine's fine. I'll be bringing my tap water in next.
I'll update this post as I conduct additional tests.
Results (in Portuguese) can be found here: https://www.dropbox.com/sh/j8aa2q6wy35z ... j6aoa?dl=0
Refs:https://en.wikipedia.org/wiki/Drinking_ ... _standardshttps://en.wikipedia.org/wiki/Zamak
Hope this is helpful for someone, some day.