Septic System Backup — Category 3 Biohazard Response

Keep people and pets out of affected areas — septic water contains pathogens and gases

⚠ Hydrogen sulfide gas from septic backup can be lethal in enclosed spaces

Open windows in unaffected areas only — do not run HVAC or fans in contaminated zones

⚠ Fans aerosolize bacteria throughout the home

Photograph backup source, affected rooms, and water lines from a safe distance

⚠ Document before any cleanup for insurance

Do NOT clean septic backup yourself — requires IICRC S500 Category 3 protocols

⚠ Bleach does not decontaminate porous materials

Call septic pumping service to address tank/drain field failure — restoration handles interior decontamination

⚠ Backup will recur until septic system is repaired

Call insurer — septic backup may require sewer backup endorsement ($50–$250/year)

⚠ Standard policies often exclude septic/sewer backup