I sometimes put in long days fishing streams and small rivers in Wisconsin for trout. I got tired of carrying 2 liters or more of water so I have started bringing my Sawyer squeeze filter. It works like a charm and the water I draw is nice and cool. But then I started thinking about agricultural pesticides and fertilizers from adjacent farm fields that inevitably flow to the adjacent water systems. I wrote to Sawyer thinking they would tell me I'm alright on this score. Unfortunately they could give me no such assurance. They said the filter takes out fecal contaminents (cow poop, etc.) but not pesticides and fertilizers.
So, how worried should I be to use the stream and river water? It seems to me that others of you have, or should have, the same concern.
Thanks.