Brass and lead toxicity in midrange espresso machines 8 years ago
The German Federal Institute for Risk Assessment also published some results from their research on lead migrating from espresso machines into the used water (http://mobil.bfr.bund.de/cm/343/freisetzung-von-blei-aus-kaf... and http://www.bfr.bund.de/de/fragen_und_antworten_zur_freisetzu...). Based on that, there is a huge thread in a German coffee board (https://www.kaffee-netz.de/threads/bfr-studie-zu-blei-in-sie...) where you can find several test results for different machines.