Sewage backup — what to do right now
Sewage backup is Category 3 ("black water") — the highest hazard class. PPE and containment are required for cleanup. Keep occupants and pets out of the affected area until a professional crew arrives.
Step-by-step, safety-first.
These are the immediate steps EcoClean walks customers through over the phone. None of them involves DIY restoration — just keeping the situation safe and the damage contained until a professional crew arrives.
- Step 01
Keep occupants and pets out of the affected area.
- Step 02
Stop using water inside the building — every flush, sink, shower, washer, or dishwasher cycle makes the backup worse.
- Step 03
Photograph the affected area from the doorway only. Do not walk in to document.
- Step 04
Call a plumber to clear the sewer line. The backup will continue until the line is cleared.
- Step 05
Call EcoClean: (630) 945-4181 for the cleanup. Cat 3 cleanup is not a DIY job.
- Step 06
If anyone has had skin contact with the sewage water, wash with soap and water and ask a doctor about exposure if you have concerns. We're not medical professionals.
These make the loss worse.
- Don't attempt cleanup without coveralls, waterproof boots, and at minimum a respirator.
- Don't try to save porous materials (carpet, pad, drywall below the wet line, soft contents) touched by sewage.
- Don't run the HVAC if return air pulls through the affected area.
- Don't pour bleach or household cleaners on the contamination — it doesn't address what's wicked into materials behind the visible mess.
When to call a plumber
- Active sewage backup — the line needs to be cleared.
- Multiple fixtures backing up at the same time = main-line blockage.
- Sewer line failure is suspected (cameras, hydrojetting, or excavation work needed).
When to call EcoClean
- Any visible sewage contamination in the building.
- Wet carpet, drywall, finished basement surfaces touched by the backup.
- Persistent sewage smell after the obvious surface mess is gone.
- Documentation needed for the carrier or for future resale disclosure.
Things to know before you cleanup.
Cat 3 water carries pathogens — bacteria, viruses, sometimes parasites. PPE is required.
Mold growth becomes a high-probability scenario if porous materials are left in place.
Containment with poly sheeting and HEPA-filtered negative-air machines keeps contamination from spreading.
Walk through your situation.
Read the question, find the answer that matches your situation, follow the recommendation. The flow is built around what EcoClean asks customers over the phone.
- Question 01
Is sewage still backing up?
- Yes — actively backing up
Continue to question 02.
- No — it has stopped
Continue to question 03.
- Question 02
Stop using water inside the building
Anything that drains — sinks, showers, washers, dishwashers — makes the backup worse.
Tell everyone in the building to hold off on running water.
- Water use is stopped
→ Call us at (630) 945-4181. Sewer-line failures usually need a plumber AND a restoration crew — the plumber clears the line, we handle the cleanup and disinfection.
- Question 03
Where did it come from?
- Floor drain in the basement
Continue to question 04.
- Toilet, shower, or sink
Continue to question 05.
- Not sure
Continue to question 06.
- Question 04
Floor-drain backup in the basement
This pattern usually points to a clog or failure in the sanitary line downstream of the building.
Keep occupants and pets out of the affected area.
- What do I do?
→ Call us at (630) 945-4181. Don't attempt cleanup without PPE — porous materials touched by sewage are generally discarded.
- Question 05
Backup at a toilet, shower, or sink
If only one fixture is backing up, the blockage is usually local to that branch.
If multiple fixtures are backing up at once, the blockage is in the main line — call a plumber immediately.
- Only one fixture affected
→ Call a plumber to clear the branch. Call us at (630) 945-4181 if the overflow contaminated flooring or finished walls.
- Multiple fixtures
→ Call a plumber for the main line immediately. Then call us at (630) 945-4181 for the cleanup.
- Question 06
Sewage — source unclear
- Walk me through it
→ Call us at (630) 945-4181 — we'll inspect, identify the source, and coordinate with a plumber if the building's sanitary line needs work.
Photos and notes the carrier expects.
Photograph the source (floor drain, fixture, lateral) from the doorway.
Capture the affected materials before any removal.
Note when the backup started and when water use was stopped.
Keep a list of porous materials that came out — the carrier will ask.
Reference material this triage draws from.
- IICRC S500 — Institute of Inspection, Cleaning and Restoration Certification — Standard for Professional Water Damage Restoration
- CDC — Floods & Sewage cleanup — Centers for Disease Control & Prevention floodwater & sewage health guidance (https://www.cdc.gov/healthywater/emergency/extreme-weather/floods-flooding.html)
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.
Don’t wait it out. Call us.
Every hour the building stays wet, the scope gets bigger. We’ll be on site in 60–90 minutes.