Are inert ingredients in pesticides toxic?
The term inert implies that a substance is non-toxic, but all inerts are toxic to some degree. The inert ingredients used in pesticide products must be tested to determine their toxicity. Only inert ingredients approved by EPA are allowed to be used in pesticide products. In addition, EPA encourages pesticide registrants to use the least toxic inerts in their products. In addition to testing the toxicity of the active ingredient, the toxicity of pesticide products, including the inert ingredients, must be determined.