I am not sure if they go into public water ways. We have sewers and what I call gutters at the end of streets that accept all storm water. I am guessing chemical run off can't be that bad because 1 outta every 5 houses use Tru green or another type of company to spray. They may not be checking the ground for chemicals either. I am trying to be safer than the average home owner. I actually got mad at myself yesterday because I was spraying in my yard and I should have just been hand pulling because I don't have hardly any weeds. I counted maybe 25 little weeds in 10000 sqft of grass. I used the left over mix and sprayed the neighbors lawn.
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