The EPA signal word 'Caution' indicates which level of toxicity?

• A. High level of toxicity
• B. No toxicity
• C. Moderate toxicity
• D. Minor level of toxicity

Answer: (D)

EPA signal words communicate how acute toxic a product is. “Caution” signals the lowest level of acute toxicity among the standard words, meaning the product is slightly toxic or carries a minor hazard. The order goes from highest hazard with “Danger” to moderate with “Warning,” to the lowest with “Caution.” So, this word indicates a minor level of toxicity. Even with this lower hazard, you still follow label directions and use any required PPE, because misuse can still cause harm. The other, higher-hazard terms describe greater toxicity, while no signal word would imply no stated acute hazard.