In cold-weather decontamination, what type of water is recommended for decon showers?

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

Answer: (B)

Warm water is used in cold-weather decontamination because it lets people stay under the spray long enough to rinse away contaminants while minimizing heat loss. In a cold environment, comfortable, warm water keeps the body from cooling rapidly, reducing the risk of hypothermia and making the decon process tolerable and more effective. Hot water might burn or irritate the skin and can sometimes increase chemical absorption, while cold water accelerates heat loss and makes thorough washing harder. Boiling water isn’t practical or safe for decon showers, and just “tap water” can be any temperature unless you’ve warmed it—so warmth, not the source, is the key.