Regulations and ordinances can be and can sometimes become overburdening and needlessly complex, but never think for one moment a heavy industry giant has anyone's interest in mind besides their own bottom line.
Their loyalty is to their shareholders and no one else. If people get poisoned or develop cancer because of their pollutants, it only matters when it comes time for them to pay legal costs, if they ever do. This can go for both governmental agencies and private industries. There's a more than just chrome 6 in drinking water supplies, and there is nothing wrong with demanding accountability from those who pollute and those who are in charge of ensuring a safe environment for human beings.