Which NFPA 704 quadrant would you check first to assess water reactivity risk?

Which NFPA 704 quadrant would you check first to assess water reactivity risk?

• A. Red
• B. Blue
• C. Yellow
• D. White

Answer: (D)

Water reactivity risk is flagged in the white quadrant, the part of NFPA 704 reserved for special hazards. The colored quadrants tell health, flammability, and general reactivity, but water reactivity lives in the white section. A symbol or letter in the white quadrant (often a W) indicates the material may react with water. If you see that, water contact could trigger a dangerous reaction, so you’d adjust handling, storage, and firefighting approaches accordingly (often avoiding water-based suppression or using special procedures). If the white quadrant has no water-reactivity indicator, water isn’t a special hazard to watch for, though you still consider the other hazards.

Water reactivity risk is flagged in the white quadrant, the part of NFPA 704 reserved for special hazards. The colored quadrants tell health, flammability, and general reactivity, but water reactivity lives in the white section. A symbol or letter in the white quadrant (often a W) indicates the material may react with water. If you see that, water contact could trigger a dangerous reaction, so you’d adjust handling, storage, and firefighting approaches accordingly (often avoiding water-based suppression or using special procedures). If the white quadrant has no water-reactivity indicator, water isn’t a special hazard to watch for, though you still consider the other hazards.