we have ALOT of residential areas with septic tanks for each house and most of these dont work right so it dumps raw sewage into ditch which goes to river...
we have ALOT of runoff from farms, chemical plants and then our filthy streets that end up in river... this is just a few things, not saying that OUR AREA is to blame completely for this because we get other crap from all around us and north of us by rivers
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