Restoration Services
Sewage backup is the most hazardous type of water damage a property can experience. Raw sewage contains pathogenic bacteria including E. coli, Salmonella, and Shigella, parasites such as Giardia and Cryptosporidium, viruses including Hepatitis A and Norovirus, and a complex mixture of organic waste, chemicals, and pharmaceutical residues. The ANSI/IICRC S500 Standard classifies sewage as Category 3 black water the highest contamination category requiring the most stringent safety protocols, material removal standards, and decontamination procedures in the water damage restoration industry.
Sewage backup events are not rare in New Castle County. Wilmington's combined sewer system which carries both sanitary sewage and storm water in the same pipes regularly exceeds capacity during heavy rainfall, forcing untreated sewage back through basement floor drains and lower-level plumbing fixtures. Throughout the county, aging clay sewer laterals crack and allow root intrusion that eventually blocks flow, and deteriorating cast-iron drain lines develop obstructions that cause sewage to back up into the lowest fixtures.
Delaware Water Damage Pros provides emergency sewage cleanup and biohazard restoration 24/7 across all of New Castle County. Our technicians are trained in bloodborne pathogen safety, operate under strict OSHA protocols, and follow IICRC S500 Category 3 remediation standards for every sewage event.
Sewage in your property? Do not touch it. Call us immediately for Category 3 emergency response.
(302) 400-8531Sewage is not dirty water. It is a biohazard that presents immediate health risk to anyone who contacts it without proper protection.
During heavy rainfall, Wilmington's combined sewer system and aging sanitary sewer infrastructure throughout New Castle County can exceed capacity. When the main sewer line cannot handle flow volume, pressure reverses and pushes sewage back through the lowest connected fixtures typically basement floor drains, utility sinks, and first-floor toilets.
The sewer lateral is the pipe connecting your property to the municipal sewer main. Root intrusion from trees and shrubs, accumulation of grease and debris, pipe collapse from age or soil movement, and offset joints in older clay pipe laterals create blockages that cause sewage to back up into the property. Properties in Wilmington, Claymont, New Castle, and Brookside with aging clay laterals face elevated risk.
Toilet overflows containing feces are classified as Category 3 regardless of volume. Even a single overflow event contaminates the surrounding floor area and any materials the water contacts. This includes overflow that seeps through floor penetrations into the ceiling of the room below.
Properties in rural areas of New Castle County including Townsend, Saint Georges, Odessa, Port Penn, and portions of Hockessin and Yorklyn that rely on septic systems can experience sewage backup when the system fails due to tank overflow, drain field saturation, or mechanical failure of pump-assisted systems.
Basement floor drains connected to the sanitary sewer can allow sewage to enter the basement when the sewer line experiences backpressure. Properties without a backwater valve on the sewer lateral are particularly vulnerable.
Before entering the affected area, our team assesses electrical hazards (sewage-submerged outlets and appliances), gas line integrity, and structural stability. We establish containment barriers between affected and unaffected areas using polyethylene sheeting and negative air pressure machines with HEPA filtration to prevent cross-contamination of clean areas.
All technicians working in sewage-affected areas wear full PPE: Tyvek protective suits, waterproof boots, chemical-resistant gloves, N95 or P100 respirators (or powered air-purifying respirators for extended exposure), and eye protection. No exceptions.
Sewage water is extracted using dedicated equipment that is decontaminated after each use. Truck-mounted and portable extractors remove standing sewage. Submersible pumps handle deep accumulation. Water extraction services
Every porous material contacted by sewage is removed: carpet, pad, lower drywall sections, insulation, baseboards, particleboard cabinetry, and all contaminated contents. Materials are double-bagged in heavy-gauge poly bags, sealed, and removed for proper disposal.
All remaining hard surfaces concrete, wood framing, subfloor sheathing, metal, solid wood are mechanically cleaned to remove visible contamination, then treated with EPA-registered hospital-grade biocide. Biocide application follows a wet-contact protocol ensuring sufficient dwell time for effective pathogen kill. A second antimicrobial application follows to provide residual protection during the drying phase.
Portable HEPA air scrubbers run continuously during and after cleanup to filter airborne contaminants, microbial particles, and volatile compounds from the indoor air environment. Air changes per hour are calculated based on room volume to ensure thorough air purification.
After decontamination, commercial air movers and dehumidifiers dry the structure to verified dry standard. Sewage-affected structures require extended monitoring to confirm both moisture content and microbial conditions are within safe parameters before reconstruction. Structural drying services
Sewage odor persists even after visible contamination is removed because volatile sulfur compounds and organic acids absorb into porous building materials. We use hydroxyl generators and thermal fogging with EPA-registered odor counteractants to neutralize residual odor at the molecular level.
Complete rebuild of affected areas: new drywall, insulation, baseboards, flooring, painting, and fixtures to restore pre-loss condition.
The single most effective prevention measure is installation of a backwater valve on the sanitary sewer lateral. A backwater valve allows sewage to flow out of your property normally but closes automatically when flow reverses, preventing sewage from entering through floor drains and low-level fixtures. Backwater valves are relatively inexpensive compared to the cost of a single sewage cleanup event.
Additional prevention measures include routine sewer lateral inspection using video camera, root treatment or pipe replacement for laterals with root intrusion, grease trap maintenance, and avoiding flushing materials that contribute to blockages.
FAQ
Yes. Sewage contains pathogenic bacteria, viruses, and parasites that cause gastrointestinal illness, skin infections, and respiratory problems. Do not contact sewage without proper protective equipment. Keep children and pets completely away from sewage-affected areas. If you have contacted sewage, wash thoroughly with antibacterial soap. Seek medical attention if you develop symptoms of illness after exposure.
For very small spills (a minor toilet overflow without feces affecting only hard flooring), surface disinfection with a bleach solution may be adequate. Any sewage event involving fecal matter, any event affecting carpet or porous materials, any basement sewage backup, and any event where sewage has spread beyond the immediate fixture area requires professional Category 3 remediation. The health risk of improper sewage cleanup far exceeds the cost of professional service.
Many Delaware homeowners policies cover sewage backup damage, but it often requires a specific endorsement (sometimes called sewer and drain backup coverage or water backup coverage). This endorsement is typically inexpensive and provides critical protection. Review your policy or contact your agent to confirm you have this coverage. Standard policies may have sublimits for sewer backup claims.
A typical residential sewage backup affecting a basement or single floor takes 5 to 10 days for complete remediation: 1-2 days for extraction, material removal, and decontamination; 3-5 days for structural drying; and additional time for reconstruction. The timeline extends for larger affected areas or when secondary mold damage has developed.
Not if the cleanup is performed correctly. Our process includes complete removal of all contaminated porous materials, thorough biocide treatment of all remaining surfaces, HEPA air scrubbing, and hydroxyl generator odor neutralization. These combined steps eliminate both the source of sewage odor and the residual volatile compounds that cause lingering smell. If odor persists after a sewage cleanup, it typically indicates that contaminated materials were missed or decontamination was incomplete.
A backwater valve is a device installed on your sewer lateral that allows sewage to flow out normally but closes automatically when flow reverses direction, preventing sewage from backing up into your property. If your property has experienced sewage backup, or if you are in an area served by a combined sewer system (parts of Wilmington), or if your property's lowest fixtures are below the sewer main elevation, a backwater valve is strongly recommended. The cost of installation is a fraction of a single sewage cleanup event.
24/7 Emergency Line
Water damage does not wait, and every hour of delay increases the cost and complexity of restoration. Whether you are standing in a flooded basement right now, watching water spread from a burst pipe, or you have discovered signs of hidden water damage, the next step is the same: call Delaware Water Damage Pros for immediate emergency response.
We are available 24 hours a day, 7 days a week, every day of the year. No answering services. No appointment scheduling. Direct dispatch to your property.
Or fill out our emergency contact form and a team member will call you back within minutes.