Water Damage Restoration Technician (WRT) Certification Practice Test

Which type of materials must be removed during cleaning and decontamination of Category 3 water losses?

1. Non-porous materials

2. Highly porous materials

3. Composites

4. Metal surfaces

The correct answer is: Highly porous materials

In the context of water damage restoration, particularly with Category 3 water losses, which are classified as highly contaminated and potentially harmful, it is critical to recognize the materials that pose significant health risks and contamination concerns. Highly porous materials, such as carpet, drywall, and upholstery, are particularly susceptible to absorbing contaminants present in Category 3 water, which may include sewage, bacteria, and various pathogens. These materials can retain harmful substances even after they appear to have been cleaned or dried, making them a continual health hazard. Therefore, during the cleaning and decontamination process, it is essential to remove highly porous materials to effectively eliminate the risk of contamination and restore a safe environment. In contrast, while non-porous materials, composites, and metal surfaces may require cleaning and sanitization, they do not absorb contaminants to the same extent and may be salvageable if properly treated.