Category 3 water is not a DIY job

Backups from a main line or septic carry contaminants that require containment, PPE, and proper disposal. This is the one where nobody should be mopping with a shop towel.

How crews handle it

• Containment — the affected area is sealed off from the rest of the home
• Removal of affected porous materials per safety rules
• Full disinfection — antimicrobial after the solids and rinse
• Clearance documentation for insurance

What it costs

$2,000–6,000 typical for a residential backup with removal and treatment.