Originally Posted by greendoctor
Anything applied to the soil in large quantities for termite control that is environmentally persistent and not strongly bound to soil will find its way into surface water. That is why there is so much chlordane, dieldrin, and heptachlor in the waterways in Hawaii. I have to wonder how much of the permethrin and bifenthrin that went off target and caused them to be restricted for outdoor pest control came from termite applications. An average termite treatment uses a quart or more of 7.9% bifenthrin SC per house. Where an outdoor surface application only uses an ounce or two at a time.
Most cognitive authorities suspect homeowners not professional applicators. Of the major cities checked, I think Dallas was the one with high Fipronil and I suspect because of fire ant treatments.