Updated 29 September 2026.
About the illustration: its source examples are simplified. Standing water is not automatically Category 3, and rainwater is not automatically Category 1. The source, water path and contamination findings determine the category.
Category 1, 2 and 3 describe water contamination, not simply how much water entered a property. A small sewage spill and a large drinking-water pipe leak can require different restoration approaches. The source and what the water has contacted need assessment.
This guide explains the categories, the limits of common labels such as clean, grey and black water, and the questions to ask when arranging water damage assessment and restoration.
What Are the Water Damage Categories?
Category 1: Clean Water
Category 1 starts from a sanitary source and does not present a substantial exposure risk. A broken drinking-water supply pipe or an appliance supply-line leak can be an example. This is different from used water discharged by an appliance.
The source alone does not settle the category after water has travelled through a property. Tell the assessor about any existing contamination along its path.
Category 2: Grey Water
Category 2 involves contamination that can cause discomfort or illness. Used water from a dishwasher or washing machine, and water from a broken aquarium, are possible examples. The actual incident and affected materials still need assessment.
Do not assume water is harmless because it looks clear or has little smell. A household appliance can have both a clean supply connection and a contaminated discharge side.
Category 3: Black Water
Category 3 is heavily contaminated water with a potential for serious adverse health effects. Examples include sewage, rising river or stream water and seawater flooding. Keep people and pets away from suspected contaminated water and arrange professional help.
The labels describe contamination; they are not a visual colour test. Read more about sewage clean-up when a waste-water source is involved.
Can the Category Change Over Time?
Yes. Conditions can change as water contacts materials and contaminants develop. Time and temperature matter, but 24 or 48 hours is not an automatic category-change rule. Nor is it a safe waiting period before arranging help. The assessment considers the source, conditions and contamination evidence.
Is Storm or Rainwater Always Category 3?
No. The IICRC S500 Consensus Body’s 2026 position statement on weather-related water damage clarifies that water entering from above or as wind-driven rain is not automatically Category 3. Inspection and information about contamination determine the category. This does not make outside floodwater safe to enter or handle.
Why Proper Classification Matters
The category helps inform contamination controls, worker protection and the restoration scope. For contaminated Category 2 or 3 incidents, remediation is addressed before restorative drying. Drying a material does not by itself establish that it has been cleaned appropriately.
Material decisions also matter. The EPA’s flood-cleanup guidance distinguishes items that can be cleaned and dried from absorbent materials that cannot. Some contents need specialist advice. A blanket promise to save everything, or remove every material in every incident, is not a useful substitute for an assessed scope.
Cleaning products are selected for the surface and task. Where a disinfectant is appropriate, cleaning comes first and the product instructions matter. Treatment does not replace moisture control or removal of materials that cannot be restored. Do not mix cleaning products.
What to Ask During Reztor’s Assessment
Reztor’s own team explains the findings and proposed restoration work. Useful questions include:
- What is the suspected source, and what information supports the category?
- Which rooms, contents and building materials are affected?
- What can be retained, and why is lifting or removal recommended elsewhere?
- What cleaning and drying work is proposed, and how will progress be recorded?
- Are specialist assessment, testing or separate licensed trades needed?
- What is included in the quote, and what approvals are required?
Testing and specialist involvement depend on the findings and scope; they are not a universal guarantee of safety after every water incident. Learn what happens on the first visit and how structural drying is monitored.
Does the Water Category Determine Insurance Coverage?
A restoration category describes the assessed water conditions. Your insurer determines coverage under your policy and the circumstances of the loss. Reztor can provide restoration records such as photographs, moisture findings and scope notes; these do not guarantee approval or a dispute-free claim. See our guide to working with your insurer.
Key Takeaways
- Share the water source, when the damage was discovered and what the water has affected.
- Ask for the reasons behind the category and recommended scope.
- Confirm what can be restored, what needs removal and how progress will be checked.
- Keep the restoration records and confirm claim requirements with your insurer.
Need Help With Water Damage?
Call 1800 739 867 for 24/7 emergency contact, or send details and photos. We discuss the urgency, current availability and next steps for your property.