Sewage backup and blackwater cleanup

What this involves

Sewage backups happen when a main line clogs or collapses, a municipal line surcharges during heavy rain, a septic system fails, or a toilet overflows repeatedly. The water that comes up is blackwater: it carries human waste, bacteria and viruses and spreads quickly across floors and into walls. In Middle Tennessee, crawlspaces and finished basements are common trouble spots, because sewage can sit unseen under a house for days. Within a day or two, moisture in drywall, insulation and wood also sets up conditions for mold. Not all water damage is sewage. Water from a clean supply line is handled very differently from water that came up through a floor drain or toilet. Water that starts clean can also become contaminated if it sits for days or runs through soil and debris. Knowing the source decides how much material has to come out.

Why professional remediation matters

Public health guidance treats sewage as a serious contamination source. Floodwater and sewage can carry bacteria such as E. coli, viruses, and parasites, and CDC and EPA guidance generally advises discarding porous items, such as carpet, pad, upholstered furniture and mattresses, that have been soaked by sewage. Cleanup involves pumping or extracting water, removing affected porous building materials, cleaning and disinfecting what remains, and drying the structure thoroughly so mold does not follow. A plumber needs to fix the cause first, or the problem comes back. Crawlspaces add their own difficulties: tight access, vapor barriers that trap sewage underneath, and insulation in the floor joists that may need to come down.

What to avoid before help arrives

• Do not use toilets, sinks, showers or washing machines until the cause of the backup is fixed. Every drain adds more water to the problem.
• Do not walk through sewage in regular shoes or let children or pets into the area.
• Do not try to save carpet, pad or upholstered furniture that sat in sewage.
• If water is near outlets or appliances, do not enter the area until the power has been shut off safely.

How the work is done

1. Cause and safety. We confirm a plumber has found and stopped the source, and check for electrical hazards before entering.
2. Extraction. Standing sewage is extracted and solids are removed.
3. Removal. Porous materials that were soaked, such as carpet, pad, lower drywall and insulation, are cut out and bagged.
4. Cleaning and disinfection. Hard surfaces and exposed framing are cleaned and then disinfected with an EPA-registered product.
5. Drying. The structure is dried with air movement and dehumidification, and moisture readings are taken until materials are dry.
6. Final check. We review moisture readings and the work with you, and note what needs to be rebuilt.

Waste handling

Extracted sewage goes to an approved sanitary disposal point, not a storm drain. Removed building materials are bagged and disposed of as solid waste under local rules.

Afterward

Once the space is dry, rebuilding can begin. Keep the plumber's report, photos and moisture readings for your insurance claim; many homeowners policies treat sewer backup differently from other water damage, sometimes under a separate endorsement.

Rules that apply in Tennessee

• OSHA Respiratory Protection Standard 29 CFR 1910.134 · checked 2026-11-03

Where we provide this service

Throughout our Middle Tennessee service area, including:

• Nashville
• Murfreesboro
• Clarksville
• Franklin

Related

• Human feces cleanup
• Public restroom biohazard cleanup

Questions