What should you never use to mix with pesticide sprays?

• A. Distilled water
• B. Tap water
• C. Warm water
• D. Cold water

Answer: (C)

When you mix pesticides, temperature matters because many formulations are sensitive to heat. Warm water can cause the active ingredient to degrade or react more quickly, which reduces how effective the product is. It can also raise volatility, increasing the risk of fumes, drift, or exposure to you and bystanders. Because of that, use water at room temperature or as specified on the label. Distilled or tap water are typically acceptable as long as the label doesn’t require a specific temperature, but warm water should be avoided.