Sewer backup — sewage in the basement or floor drains
A sewer backup is Category 3 (black) water flowing the wrong way through floor drains, toilets, or laundry standpipes — the highest hazard class in restoration. Keep occupants out, don't run any drains, and call a plumber to clear the line. EcoClean handles the cleanup: PPE, containment, removal of contaminated porous materials, sanitation, and structural drying.
On site in 60–90 minutes anywhere in Chicagoland.
Sewer backup — plain English.
A blockage downstream in the building lateral or municipal main forces sewage back through the lowest fixtures in the building — floor drains, basement toilets, laundry standpipes. Heavy rain, root intrusion, and grease blockages are the usual upstream causes.
Sewage water is Category 3 — grossly contaminated. PPE and containment aren't optional, and most porous materials touched by Cat 3 water (carpet, pad, drywall below the wet line, soft contents) come out rather than getting cleaned in place.
This is not a DIY cleanup. Calling a plumber to clear the line and a restoration company to handle the contamination is the only safe playbook.
Safety-first triage while you wait for us.
These are the first steps EcoClean walks customers through over the phone. None of them involves DIY restoration — just keeping the situation safe until a professional crew arrives.
- Step 01
Keep occupants and pets out of the affected area.
- Step 02
Stop running water inside the building — every flush, sink, washer cycle, and dishwasher run makes the backup worse.
- Step 03
Don't try to clean Cat 3 water without rubber gloves, waterproof boots, and at minimum a respirator. If you don't have all three, just keep everyone out and wait.
- Step 04
Photograph the affected area from the doorway — don't walk in to document.
- Step 05
Call a plumber to clear the line. Call us for the cleanup.
Two different jobs. Most losses need both.
A plumber fixes the source. A restoration company handles everything after — extraction, drying, documentation, reconstruction.
When to call a plumber
- Sewage is actively backing up or the smell tells you a backup is in progress.
- Multiple fixtures (a sink, a toilet, a shower) back up at the same time — that's a main-line blockage.
- You need a sewer-line camera, hydrojetting, or a rooter to clear the line.
When to call EcoClean
- Any visible sewage contamination in the building.
- Wet carpet, carpet pad, drywall, or finished basement surfaces touched by the backup.
- Persistent sewage smell after the obvious surface mess is gone.
- Documentation needed for the carrier or for resale disclosure later.
The field response.
- 01
Full PPE — coveralls, respirators, waterproof boots — for everyone in the affected area.
- 02
Containment with poly sheeting and negative-air HEPA scrubbers when the contamination has spread past one room.
- 03
Removal and disposal of Cat 3-contaminated porous materials: carpet, pad, saturated drywall below the wet line, soft contents.
- 04
Surface cleaning followed by EPA-registered antimicrobial — not a substitute for removing contaminated material, but the right finishing step.
- 05
Structural drying with calibrated air movers and dehumidifiers once contamination is removed.
- 06
Daily readings on a signed dry-out log + a written final clearance check before reconstruction starts.
What's wet that you can't see.
The visible wet area is rarely the full picture. Thermal imaging + moisture readings map the actual footprint so demo only happens where it has to.
Subfloor under carpet pad — sewage soaks through fast and contaminates the substrate.
Drywall cavity insulation along walls touched by the backup.
Hollow-core door bottoms that sat in the contaminated water.
HVAC return air pulls if a duct ran through the affected area.
Mold growth on porous materials that weren't removed during initial cleanup.
Sewer backups are commonly excluded under a standard homeowner policy but covered under a separate Water Backup / Sewer Backup endorsement. Coverage and limits vary by carrier. We document the loss the way carriers want regardless of which policy is in play.
What we capture: arrival photos before any cleanup, the source identification (floor drain, fixture, lateral), affected materials, removal manifests, antimicrobial product labels, the daily drying log, and a written clearance note when the area is ready for reconstruction.
Recent EcoClean work
New work is added after each project closes. In the meantime, call us about your situation — we’ll tell you what we’d do next.
What homeowners ask first.
Is sewage backup actually dangerous, or is it just gross?
It is dangerous. Sewer water is Category 3 — it carries pathogens. PPE is required for cleanup, and porous materials touched by Cat 3 water are generally removed rather than cleaned in place.
Can I clean a small sewage backup myself?
We don't recommend it. The risk isn't just the visible mess — it's the contamination wicked into materials behind it that you can't see and can't safely clean without containment. Keep people out and call us.
Will the carpet have to come out after a sewage backup?
Yes. Cat 3 water means both the carpet and the pad come out as a default. The subfloor is cleaned, disinfected, and dried.
How do I tell if it's a sewer backup or a sump-pump flood?
Sewer backups smell like sewage and come up through fixtures and floor drains. Sump-pump floods are groundwater — they don't smell sewage and the water spreads from the sump pit outward. If you're not sure, treat it as Cat 3 until proven otherwise.
Will insurance cover a sewer backup?
Sewer/water backups are typically covered only if you carry a Water Backup endorsement on your homeowner policy. Coverage and limits vary by carrier. We document the loss either way.
Terms that come up on this kind of loss.
Walk through the emergency triage.
Step-by-step, safety-first. Built around what EcoClean asks customers over the phone.
Sewage backup — what to do right nowDirect answers for sewer backup.
More water-damage causes we handle.
Cities EcoClean covers from Downers Grove HQ.
EcoClean operates one HQ in Downers Grove. We do not claim a branch in any other city.
Tell us what's happening.
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Reference material this page draws from.
- IICRC S500 — Institute of Inspection, Cleaning and Restoration Certification — Standard for Professional Water Damage Restoration
- CDC — Cleanup After a Sewage Backup — Centers for Disease Control & Prevention floodwater & sewage health guidance (https://www.cdc.gov/healthywater/emergency/extreme-weather/floods-flooding.html)
- 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.
Water spreading. Call now.
Every hour the building stays wet, the scope gets bigger. We'll be on site in 60–90 minutes.