I've worked at Xerox and in the Kodak sites around Rochester, NY, USA. They're all EPA Superfund sites. Surely there's negative health impacts of working on contaminated ground, but MANYMANY* high tech locations in the USA are EPA Superfund sites due to that's where the tech was created and the buildings and infrastructure were already present, so current tech companies just keep using them. Most of the buildings I had worked in had regular tap water testing performed and if any test came back with too high of levels then water filters were installed. I'm sure Apple does similar.
Xerox even has a bunch of patents about how to suck up and treat ground water.
Santa Clara County has the most Superfund sites of any county in the US, so it's hard to find somewhere to build that isn't contaminated. Between mercury mining, agriculture, the military and the semiconductor industry, SiValley is quite polluted.
Xerox even has a bunch of patents about how to suck up and treat ground water.