Water Damage Restoration Technician (WRT) Certification Practice Test 2026 – Your All-in-One Guide to Mastering the Exam!

Gray water is defined as wastewater that is generated from domestic activities such as bathing, washing dishes, and laundry, which is distinct from both clean water and black water. The classification of gray water is typically based on its sources and levels of contamination. Water from kitchen sinks falls into this category because it may contain some food particles and soap, making it unsuitable for direct human consumption but it is not as contaminated as black water, which comes from toilets and contains fecal matter.

Rainwater is generally considered clean when harvested directly from precipitation but is not classified as gray water; it does not originate from household activities that produce wastewater. Water from toilet bowls is categorized as black water due to its high level of contamination with potentially harmful pathogens. Groundwater can vary in quality but is not classified as gray water in the context of plumbing systems.

Understanding these distinctions is important for proper water management and restoration practices, as different categories of water must be handled with different protocols to ensure safety and compliance with health standards.