It has always bothered me that he used super strength magnetic fields to manipulate non-magnetic metals. yes, that is the thing in the xmen universe that breaks reality for me, everything else is fine
That is realistic though, he just needs to move the magnetic field to induce a current in them. He should be able to affect any conductor.
Does this mean he might also have limited water powers in regions where the ratio of metallic solids in the water is above a certain threshold? Kinda like the "metal in your blood" scene in that one X-Men movie.
I think that's exactly what it means. Avoid entering caves with Magneto. There's a lot of minerals dissolved in those drip drops