What are the stages of decontamination commonly used at hazmat incidents?

• A. Secondary decon (removing residual contamination), gross decon (removing bulk contamination), and specialty decon if required.
• B. Gross decon (removing bulk contamination), secondary decon (removing residual contamination), and specialty decon if required.
• C. Specialty decon (removing bulk contamination), gross decon (removing residual contamination), and secondary decon.
• D. Gross decon, specialty decon, final rinse.

Answer: (B)

Decontamination at hazmat incidents follows a staged approach from removing the bulk of contamination to addressing more specific needs. Start with gross decon to quickly remove most of the contamination on skin, clothing, PPE, and exposed surfaces. This step reduces the amount of contaminant available to spread and makes the subsequent cleaning more effective. After the bulk is gone, proceed to secondary decon to clean away the residual contamination that didn’t come off in the initial wash. This is a more thorough cleaning, often using stronger or more targeted methods to ensure any remaining contaminants are removed. If there are items or situations that require specialized methods—because of the type of contaminant, the sensitivity of equipment, or the need for a particular decon agent—specialty decon is applied next, only as needed. This order minimizes cross-contamination, protects responders, and ensures a complete clean. Starting with secondary or specialty decon would leave bulk contamination untreated longer, increasing exposure and spread, and framing a final rinse as a separate initial stage isn’t aligned with the standard bulk-to-residual-to-specialized progression.