Sewage Backup Cleanup in San Diego
Treat sewage backup as hazardous: keep children and pets away, don't touch it without gloves and boots, and stop using sinks, toilets and appliances that drain into the line. Sewage is Category 3 water, so porous materials it touches — carpet, pad and the bottom of drywall — usually have to be removed, not just dried.
Why sewage needs professional cleanup
Sewage contains bacteria and viruses that soak into porous materials. Professional cleanup follows a contamination process: containment, removal of affected porous materials, cleaning and disinfecting hard surfaces, drying, and often verification before rebuilding.
| Category | What it is | Typical sources |
|---|---|---|
| Category 1 — clean water | From a sanitary source; lowest risk if handled quickly | Broken supply line, burst pipe, overflowing sink |
| Category 2 — gray water | Some contamination; can cause illness | Washing machine or dishwasher overflow, toilet overflow (urine only) |
| Category 3 — black water | Grossly contaminated; most hazardous | Sewage backup, outside floodwater, river or storm flooding |
Categories come from the IICRC S500 standard for professional water damage restoration. Clean water can become Category 2 or 3 if it sits.
Common causes
- Tree roots or grease blocking your private sewer lateral.
- Main line clogs that push sewage up through the lowest drain or shower.
- Municipal sewer overloads during heavy storms.
Coverage
Many standard homeowners policies exclude sewer or drain backup unless you added a specific "water backup" endorsement. Check your declarations page before cleanup starts and photograph everything.
Nationally, water damage restoration averages about $3,867, with most homeowners paying roughly $1,384–$6,387 (HomeAdvisor 2026 data). San Diego labor costs tend to run higher than the national average, and severe or contaminated losses can exceed $10,000. Category 3 losses generally cost more than clean-water losses because of removal and disinfection.
Why sewage cleanup is different
Sewage is Category 3 water. It can carry bacteria and viruses, so crews wear protective equipment, set up containment, remove porous materials like carpet, pad and lower drywall that sewage touched, and disinfect hard surfaces before drying. Items that can't be properly cleaned are usually thrown away. Keep children, older adults, and anyone with a weakened immune system away from the area.