In many cases they do but neglect to adequately inform employees that may be potentially be affected. At the Google Quad campus in Mountain View there was an i

In many cases they do but neglect to adequately inform employees that may be potentially be affected. At the Google Quad campus in Mountain View there was an incident where some ventilation fans were accidentally turned off which caused employees to be exposed to TCE (affects embryo development so mainly concerning to pregnant employees) that is leeching up from the ground. I'm pretty sure that 99% of the people would not have been able to tell you it was a risk in working there. Also in the area is the "MEW plume". When I asked realtors about it while looking for real estate in the area they all claimed to know nothing about it - despite being locals and there being land development rules requiring that top soil be carted away to be treated. So many people/orgs are tacitly working together to ignore the problem since no one wants to be inconvenienced or left holding the bag.