The lawn care companies' guarantees depend on these chemicals being dangerous for long periods. The General Accounting Office of the U.S. Congress notes that it is illegal for an applicator to claim that these chemicals are safe as soon as they dry. EPA Registration is not a product safety program. Registration is designed to indicate which chemicals can be used to kill a targeted pest and not a statement of safety to humans. Most of these chemicals are absorbed through the skin.
Children roll on the lawn and skin their knees on the grass.
Pets and children track chemicals into the house even after they are dry. This doesn't count the days when the treated grass is wet from rain or dew. They are not chemically inert and most are toxic or carcinogenic in their own right. Most people use the brand name for pesticides. The chemical name is less inviting.