You might think we're simply lucky in the U.S., but the struggle to curtail pollution (all types of dumping) has been a long hard struggle carried by many people over many years. We still have some illegal dumping, but less than before.
Just my hunch now, but suppose legal dumping could be easier, cheaper, and handier. I suspect that for someone to legally dump he has to sort everything, drive a long distance, and pay exorbitant fees. If that is the case, you're going to see more illegal dumping before anything gets better.
A few years ago our local dumping authority ASKED us to please keep container glass out of the regular trash. I am happy to comply with that reasonable and civil request. All around the city there are signs on or near the storm sewers reminding people that the storm water goes directly into the streams, so would we please keep harmful substances out of the storm sewers? I think it has helped.
Currently, we have to sort our trash, but most of us are used to it, and will do it willingly. Regular household refuse goes one place. Yard waste goes another place. Building demolition another. Liquids such as chemicals, paint, and discarded cleaners are handled separately.
But then; almost nobody kills to guard his secret dumping ground, so yeah, we really are lucky.