Category 2 water
Category 2 water is significantly contaminated water — for example dishwasher or washing-machine discharge — capable of causing discomfort or illness on contact.
Cat 2 water ("gray water") is contaminated enough that porous materials are case-by-case and PPE matters.
The practical reason this term exists.
Cat 2 water raises the salvageability bar. Many porous materials that survive Cat 1 don't survive Cat 2 — particularly carpet pad, saturated drywall, and most fabric contents.
Cat 2 water still degrades over time. After 48-72 hours of sitting, it usually becomes Cat 3.
In real life, the term shows up here.
On a scope of work for a dishwasher overflow, washer discharge, or toilet overflow without sewage.
On an adjuster's call when deciding which materials are removed vs cleaned in place.
In the field.
EcoClean's Cat 2 protocol: PPE for the crew, antimicrobial application on cleaned surfaces, removal of porous materials that can't be cleaned in place, documented dry-out of materials that stay.
When in doubt between Cat 1 and Cat 2, the crew assumes Cat 2 — under-treating a Cat 2 loss is what turns it into a mold remediation job two weeks later.
Questions homeowners ask about category 2 water.
What's the difference between Cat 1 and Cat 2 water?
Cat 1 is clean potable water from a sanitary source. Cat 2 is significantly contaminated — appliance discharge, toilet overflow without solids, aquariums. Cat 2 needs PPE and antimicrobial; Cat 1 doesn't.
Will the carpet survive a Cat 2 loss?
Sometimes — it depends on exposure time and what specifically contaminated it. The pad is almost always replaced. Cat 2 sewage-adjacent water moves straight to Cat 3 protocol.
Reference material this definition draws from.
- IICRC S500 — Institute of Inspection, Cleaning and Restoration Certification — Standard for Professional Water Damage Restoration
- EPA — Mold & Moisture — United States Environmental Protection Agency mold guidance (https://www.epa.gov/mold)
Cited material informs EcoClean’s field practice. Excerpts from copyrighted standards are not reproduced on this page. Nothing on this page is legal, medical, or insurance-coverage advice.
Last reviewed by EcoClean field team — May 16, 2026.
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