Emergency · Sewage Backup Emergency

Sewage in Your Home — Category 3 Biohazard Response

Sewage backup is Category 3 black water — a biohazard. Evacuate affected areas, do not attempt DIY cleanup, and call IICRC-certified decontamination specialists immediately.

(888) 217-3503Mold window: 24 hours

Emergency checklist

Evacuate all people and pets from affected areas immediately — sewage contains pathogens and bacteria
⚠ Do NOT walk through sewage without full PPE (Category 3 biohazard)
Open windows in unaffected areas for ventilation — do NOT use fans in the contaminated zone (aerosolizes bacteria)
⚠ Fans spread contamination to clean areas of the home
Photograph the backup source, affected rooms, and water line marks from a safe distance
⚠ Do not touch contaminated items before documentation
Do NOT attempt to clean sewage yourself — Category 3 water requires professional decontamination per IICRC S500
⚠ Bleach does not properly decontaminate porous materials like carpet and drywall
Call an IICRC-certified restoration company with Category 3 experience — 24/7 emergency dispatch
⚠ Verify they follow IICRC S500 decontamination protocols
Call your insurer — ask specifically about sewer backup coverage (often requires a separate rider)
⚠ Standard policies often exclude sewer backup without an endorsement

Typical cost range

$3,000 – $20,000

Full cost breakdown

Mold growth timeline

Mold Growth Clock

What happens hour by hour after water damage

elapsed

0h6h12h24h48h72h1wk

or click any marker

Water Intrusion

lowHour 0

Water enters the structure. Clock starts NOW.

Recommended Action

Shut off water source, move valuables off floor, begin documentation with photos/video.

Next milestone: Absorption Begins at 1 Hour

All Milestones

Sewage Backup Emergency FAQ

: Often NO — unless you have a sewer backup endorsement (typically $50–$250/year). Standard policies exclude sewer and drain backup. Check your declarations page for 'Water Backup' or 'Sewer Backup' coverage.
: No. Category 3 water contains bacteria, viruses, and parasites. IICRC S500 requires professional extraction, antimicrobial treatment, and removal of porous materials that cannot be decontaminated. DIY cleanup creates serious health risks.
: Sewage backup cleanup typically costs $3,000–$20,000 depending on affected area, materials involved, and whether structural demolition is required. Category 3 water costs $7–$7.50/sq ft for extraction alone, plus decontamination and material replacement.

How to Shut Off Your Main Water Valve

Scene 1: Locate meter/utility room. Scene 2: Turn gate valve clockwise. Scene 3: Turn ball valve 90°. Scene 4: Test at faucet.

Video production scheduled — storyboard complete

How to Shut Off Your Main Water Valve — 90-second guide to finding and operating your main water shutoff — the most important emergency skill for water damage prevention.

Read the full guide: sewage backup cleanup guide

(888) 217-3503

Mold growth timeline

Mold Growth Clock

What happens hour by hour after water damage

elapsed

0h6h12h24h48h72h1wk

or click any marker

Water Intrusion

lowHour 0

Water enters the structure. Clock starts NOW.

Recommended Action

Shut off water source, move valuables off floor, begin documentation with photos/video.

Next milestone: Absorption Begins at 1 Hour

All Milestones

Sewage Backup Emergency FAQ

Often NO — unless you have a sewer backup endorsement (typically $50–$250/year). Standard policies exclude sewer and drain backup. Check your declarations page for 'Water Backup' or 'Sewer Backup' coverage.

No. Category 3 water contains bacteria, viruses, and parasites. IICRC S500 requires professional extraction, antimicrobial treatment, and removal of porous materials that cannot be decontaminated. DIY cleanup creates serious health risks.

Sewage backup cleanup typically costs $3,000–$20,000 depending on affected area, materials involved, and whether structural demolition is required. Category 3 water costs $7–$7.50/sq ft for extraction alone, plus decontamination and material replacement.