The water responsible for causing water damage is broken into three categories based upon the health risks associated with that source.

Category 1 — Clean Water

Clean water does not pose a substantial threat to pets and humans. This includes leaky or broken distribution lines and overflowing bathtubs and sinks.

Category 2 — Grey Water

Grey water contains chemical, biological, or physical contaminants that might cause distress or sickness in humans and pets. Examples include sump pump failures, overflowing washing machines, leaky or malfunctioning dishwashers, and bathroom overflows containing only pee.

Category 3 — Black Water

Black water is grossly unsanitary and contains dangerous bacteria and parasites that can result in severe discomfort or sickness in pets and humans. Sewage backups, bathroom overflows containing feces, and flood waters from seas, lakes, rivers, streams, or ground surface water are the most common examples. Grey water which isn't immediately removed may become black water if allowed to stay stagnant inside your home or property.


The types of water damage are based on the probable rate of evaporation dependent on the substances changed. They're utilized to determine the actions required in cleanup and quantity and type of equipment necessary to dry out the affected area.

Class 1 — Slow Rate of Evaporation

Water damage only affects a portion of a room. The substances involved are mainly non-porous and not able to absorb much moisture.

Class 2 — Fast Rate of Evaporation

Water damage affects a larger place. The substances involved are porous and absorbed some water. Water might have soaked into walls less than 24 inches .

Class 3 — Fastest Rate of Evaporation

Water harm comes from overhead and spreads over a large area. The materials involved can be porous and nonporous which are affected by a substantial quantity of water. Materials within this class include ceilings, walls, insulation, carpeting, carpet padding, cloth, and other porous materials.  You can visit this link to get more information about the water damage restoration. 

Class 4 — Specialty Drying Situations

Water damage impacts specific materials or in areas where drying and recovery may be difficult to accomplish. The substances involved could be porous and nonporous. Materials from the course include concrete, plaster, and hardwood floors. Also included are crawlspaces or other areas in which a very low specific humidity is necessary for drying.

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