Why sewage is a category of its own
The restoration industry grades water in three categories. Category 1 is clean — a supply line. Category 2 is gray — a washing machine or dishwasher discharge. Category 3 is black: sewage, and anything that contacted it. Black water carries bacteria, viruses, and pathogens that make it a health event, not a housekeeping event. That’s why the rules change: containment first, protective equipment, porous material removal, antimicrobial treatment, and no shortcuts that trade your family’s health for a smaller invoice.
The county backup pattern
Older sewer laterals in the original town grid, mature roots from decades-old landscaping hunting the line, and monsoon downpours that surcharge municipal lines in an afternoon — backups here cluster after big rain, when saturated ground and surcharged mains push back through the lowest drain in the house. Out the corridor — Roll, Tacna, Dateland — the pattern shifts to septic: a flooded drain field sends the water right back where it came from. If your drains slow down across the whole house at once, that’s the early warning: the problem is in the main line, not the P-trap, and the backup is coming.
What you can keep, what you can’t
Hard, non-porous surfaces — tile, sealed concrete, metal, solid wood that cleans — stay, sanitized. Porous material that absorbed black water goes: carpet and pad, mattresses, upholstered furniture, insulation, particleboard, and usually the bottom course of drywall. It’s not stubbornness; it’s that porous material can’t be sanitized to a safe standard, only wiped on the surface. We document every removal for your claim file, so the disposal is justified line by line.