Category 1, 2 and 3 Water: What the Categories Mean
When a water loss is described, you will often hear it called Category 1, 2 or 3. The categories describe how contaminated the water is, and they decide how the cleanup is handled. Knowing the difference helps you understand why some water losses are treated far more seriously than others. For the worst of them, sewage cleanup is the professional-only response.
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This guide explains the three categories in general terms. It is background information, not a guide to cleaning anything up yourself.
Category 1: clean water
Category 1 is water from a clean source, such as a broken supply pipe or an overflowing basin of clean water. It starts out as the least contaminated kind of water loss.
Even clean water causes damage if it sits, and it can pick up contamination as it travels through a building. Fast removal and drying still matter.
Category 2: grey water
Category 2 is grey water: water from washing machines, dishwashers, baths and basins. It carries soap, dirt and other matter, and it is treated as more contaminated than clean water.
Grey water losses need more care than clean water losses, and materials they soak are handled with that in mind.
Category 3: black water
Category 3 is black water: sewage, and floodwater that may carry sewage, chemicals and debris. It is treated as a health hazard, and cleanup is professional-only.
If you are not sure which category your water is, treat it as the more serious one and call a professional rather than guessing.
Why the category changes the cleanup
The category decides what can be cleaned and what must be removed, how the area is handled, and what protection the work needs. A clean-water leak and a sewage backup are not the same job, even when the same amount of water is involved.
That is why the first question after a water loss is often what kind of water it is. Homeowners in Rochester can arrange the same assessment, and flood damage cleanup follows the same category rules after a flood.
Key Takeaways
- Category 1 is water from a clean source, such as a broken supply pipe or an overflowing basin of clean water.
- Category 2 is grey water: water from washing machines, dishwashers, baths and basins.
- Category 3 is black water: sewage, and floodwater that may carry sewage, chemicals and debris.
- The category decides what can be cleaned and what must be removed, how the area is handled, and what protection the work needs.
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