Many wells had to be declared unsafe. The company had long gone from my area by the time of my discovery. Its leaching pools had been the source of the problem, allowing the contaminant to seep into the area's ground water. We were never informed of the danger, by the company or by the county. Not even to test my water.
Fuel can leak from gasoline storage tanks and contaminate underground water.
I understand that the problem is fairly extensive in California. Clean air, dirty water. But my guess, this has to do with who has the deepest pockets rather than with issues of public health.