EPA Toxicity Category Table
The U.S. Environmental Protection Agency assigns toxicity categories based on a substance’s potency (ability to cause harm at low doses) by various routes of exposure (e.g., oral, inhalation, dermal). Precautionary labels are required to bear a Signal Word (”Danger” and/or “Poison”; “Warning”; or “Caution”) corresponding to one of four categories of toxicity. Additionally, the statement, “Keep out of reach of children” is required on the label. The Signal Word must appear with sufficient prominence relative to other front panel text and graphic material to assure that it will not be overlooked under customary conditions
of purchase and use.