Guide
Clean vs Gray vs Black Water: Categories Homeowners Hear
Quick answer
A plain explanation of water contamination categories used in restoration work.
Why categories exist
Restoration professionals classify water by contamination risk. Category influences personal protective equipment, what materials can be saved, and how aggressively demolition proceeds.
Typical descriptions
- Clean water: broken supply lines, rainwater that has not mixed with contaminants (still can become dirty quickly)
- Gray water: appliance discharge or water with significant contamination risk
- Black water: sewage or highly contaminated sources
Standing water changes category over time as bacteria grow and materials dissolve.
Practical meaning for homeowners
If sewage or floodwater entered the home, assume higher risk and hire qualified mitigation. Porous materials like carpet pad often cannot be cleaned to a safe standard after black-water exposure.