Emergency Guide

Sewage Backup: What to Do First

Sewage backup is Category 3 ("black") water — the most dangerous category. Here's what to do (and not do) in the first hour.

5 min read

Sewage water contains bacteria, viruses, and parasites. Do not wade into it, touch it, or attempt to clean it without proper PPE. Keep children and pets out of the area.

Step 1: Stop using water

Don't flush toilets, run sinks, or run washing machines — anything you put down a drain adds to the backup. Tell everyone in the house.

Step 2: Shut off the power to the affected area

If sewage water is anywhere near outlets, the panel, or appliances, kill the breaker before anyone steps in the water.

Step 3: Ventilate

Open windows if you safely can. Sewer gases can be harmful and the smell will quickly permeate everything.

Step 4: Call a Category 3 cleanup specialist immediately

This is not a DIY job. Get a free instant quote and a vetted sewage cleanup specialist can usually be on-site within the hour, 24/7. They'll arrive with PPE, extraction equipment, and antimicrobial supplies.

Step 5: Document for insurance

Photograph everything before cleanup begins. Important: standard homeowners insurance does NOT cover sewer backup unless you have a sewer/water backup endorsement. Check your policy.

What's salvageable, what's not

  • Drywall touched by sewage water: remove (cut at least 12" above waterline).
  • Carpet and padding: throw out, always.
  • Insulation: throw out.
  • Upholstered furniture that contacted sewage: usually a loss.
  • Hard surfaces (concrete, tile, sealed wood): can be sanitized professionally.
  • Solid wood furniture: can sometimes be sanitized and salvaged.

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