Category 1 vs Category 2 Water
Published 2026-01-28 · Water Damage Restoration Renton WA
If you have been researching water damage, you may have come across the terms Category 1 and Category 2 water. Understanding the difference matters because it affects how a job is handled.
Category 1: Clean Water
Category 1, or clean water, comes from sources like a broken supply line, rainwater, or an overflowing sink with no contamination. See our clean water damage page for more detail.
Category 2: Gray Water
Category 2, or gray water, comes from sources with some level of contamination, such as washing machine discharge, dishwasher overflow, or sump pump backup. Learn more on our gray water cleanup page.
Why the Category Matters
The water category affects what precautions are taken during extraction and drying, and whether certain materials can be dried in place or need to be removed.
Category Can Change Over Time
Clean water left standing for more than a day or two can progress toward Category 2 as it picks up contaminants from the surrounding environment.
What This Means for Your Renton Property
Our technicians assess the water category during the initial inspection, which shapes the entire extraction and drying plan for your property.
If you are unsure what category of water damage you are dealing with, call us for an assessment.
Need Help With Water Damage in Renton?
If you are dealing with water damage right now, do not wait. Call our local Renton team for 24/7 emergency response.
📞 Call (425) 433-9185