[mykalberta]

Unless it goes through the ground water I cant see how alot of pesticides get into rivers. At least where I grew up, there were no crop lands adjacent tor rives. That was all reserved for prime cattle land. That is what I would worry about vis a vi water quality. And with the amount of spray that is actually applied, I cant see alot of that getting into the ground water - its not like crops are soaked, if anything for costs they are under sprayed and most farmers will take a hit on yield to save money on spray - although alot of that has to do with crop insurance not covering the costs of spraying.

I suppose with irrigation in Southern Alberta its more of an issue.