@Animandel - There are plenty of companies and individuals who for one reason or another don't throw away and dispose of dangerous chemical waste the way they should.
I enjoy hunting, and my friends and I go hunting on private land that is owned by our hunting club. The other week, we were deep in the woods in the middle of a hunt when we came across a pile of barrels that had contained chemicals.
The barrels were mostly empty, but some of them still had some of the contents. The barrels should have been classified as hazardous chemical waste and disposed of accordingly. Instead they were stacked up in the woods, about 15 feet from a stream.
Rather than pay the extra cost for disposal and thus getting rid of their chemical waste the right way, some people simply dump it where they think it can't be found or at least where if it is found it can't be traced back to them. That's just the reality of the way some people are, and how important money is to them.