That time in the US when they didnt care about the water stills exists. Check that chart on the pdf above and you will see some very bad areas that are obvious from contaminants. Things haven gotten better here but due to the size of industrialization, there will always be someone cutting corners and dumping. Its sad that they do it since they are hurting themselves but money talks.
Still many of the old factory areas in the rust and coal belt of the US have never been completely cleaned and leak into the bedrock.
Water everywhere is an issue and someday may be a bigger problem than any other global issue. Like most things, have control over your supply and intake is the only real way to be safe, get it tested.
Just recently in my hometown it was found that a local country club that was expanding to build a commercial center and some houses was found upon EPA inspection to have some heavy metal contamination from prior dumping that was hidden at the back of the site, of which is near a landfill and the local reservoir.



