How to Eliminate Sewer Smell in Your Basement After a Backup

Edgar Mirzoian

CEO, Restorerz Emergency Services

How to Eliminate Sewer Smell in Your Basement After a Backup

Even after the standing water is removed, a sewer backup can leave your basement with a persistent, foul odor. The smell often comes from bacteria-laden residue that’s seeped beneath the surface, so basic cleaners are rarely enough to fully remove the odor and the hazards that come with it. Learn why these odors linger and how to eliminate sewer smells in the basement of your Ohio home with professional help from Restorerz Emergency Services.

Key Highlights

Sewer odors after backups come from residue trapped in porous materials, wall cavities, and floor seams.
Safe cleanup requires wastewater extraction, disinfection, odor treatment, and thorough drying.
Professional crews use industrial extraction equipment, moisture meters, air filtration, and sanitization products.

What Causes Sewer Smell in a Basement After a Backup?

A sewer backup can leave wastewater on basement floors and other surfaces. This wastewater contains bacteria that break down organic matter, producing the characteristic pungent sewage odor.

Even after the standing water is removed, the backup may still have spread across concrete, seeped into floors and wall cavities, soaked other materials, and left residue trapped in areas that are difficult to reach. For instance, a floor may appear clean after standing water is removed, but residue remains trapped in cracks and textured surfaces. Basic household mops and cleaners often can’t effectively reach these remaining odor sources and, in some cases, may even spread the residue over a larger area.

Understanding Why Sewer Odors Linger

Sewer odors linger if contaminated wastewater soaks into porous materials, such as concrete, drywall, insulation, fabric, and wood. If these materials are deeply soaked, wastewater can take significantly longer to evaporate than if it were just on the surface. As long as moisture remains, the bacteria and organic residue left behind by the backup will continue to decompose, producing sewer gases and odors.

High humidity and poor ventilation are also common in basements, and these conditions can prolong the drying process and further concentrate odors. Standard household cleaners may temporarily mask the odor without removing residual contamination, so affected materials usually require deep cleaning, disinfection, deodorization, drying equipment, or removal to fully eliminate the odor.

How To Get Rid of Sewer Odor in Your House

Addressing sewer odors promptly can minimize lasting damage and health hazards and support a safer cleanup process. Follow these steps to get rid of sewer odors in your house:

Stop water use: Stop using toilets, sinks, showers, dishwashers, and laundry appliances if the drains continue to back up. Shut off the power from the breaker if the water has reached electrical components.
Minimize contact: Keep children and pets out of the basement. Minimize contact with contaminated surfaces, and wear face masks, gloves, boots, and other protective equipment.
Remove contaminated materials: Dispose of affected carpet, carpet pad, insulation, upholstered furniture, and other porous materials that are difficult to fully clean.
Clean and disinfect surfaces: Wash hard surfaces to remove visible residue, then apply a sewage-approved disinfectant according to label instructions.
Deodorize affected areas: Treat concrete joints, floor drains, baseboard gaps, and other areas where residue collects with odor-control products designed for sewage contamination.
Dry the area completely: If possible, open windows to ventilate and promote drying. Use dehumidifiers and fans to assist with faster drying.
Call a professional: DIY efforts are usually not enough to fully eliminate odors, avoid health hazards, and prevent further damage to your home. Restorerz Emergency Services offers IICRC-certified services to restore your home.

How Do Professionals Handle Sewage Smell in a House?

Professional restoration crews use a comprehensive approach to address moisture, bacteria, and sewage smells in your home. Here’s how professionals handle sewage odors in a house:

Inspection: Professionals use thermal imaging to identify which areas and materials are affected.
Wastewater extraction: If your basement is actively flooded, crews use industrial pumps and vacuums to extract wastewater and prevent secondary damage.
Material removal: Professionals remove building materials that can’t be salvaged, such as saturated drywall, insulation, carpet pad, and damaged wood products.
Cleaning and disinfection: Sewage cleanup crews clean and disinfect the remaining affected materials using antimicrobial treatments and HEPA filtration.
Drying and ventilation: Dehumidifiers and air scrubbers are strategically placed and monitored to fully dry the space and purify the air.
Odor treatment and air filtration: Crews apply deodorizing treatments to eliminate sewage smells from all affected materials in your basement.

According to the IICRC, sewage water is classified as Category 3 and contains highly hazardous bacteria, pathogens, and waste. Sewage cleanup should be left to professionals who have proper safety training and wear specialized personal protective equipment, including respirators, protective clothing and footwear, and eye protection.

How To Prevent Sewer Smells From Coming Back

Even after professional cleanup, preventing sewer smells from coming back requires proper care. Use these preventative maintenance tips to keep your basement odor-free and avoid future backups:

Check basement floor drains: If a floor drain is rarely used and goes dry, pour water into it occasionally to prevent sewer gases from entering the home.
Watch for warning signs: Slow drains, gurgling sounds, or persistent odors may indicate a blockage or another problem that needs attention.
Schedule inspections: If your home has experienced multiple backups or frequent clogs, a sewer camera inspection can identify the cause.
Ask about upgrades: A licensed professional can recommend options such as sewer line repairs, a backwater valve, a sump pump, or regular maintenance based on your home’s needs.

Rely on Restorerz To Eliminate Basement Sewage Odors

Restorerz Emergency Services is a family-owned and operated company serving Central Ohio. Our certified team follows IICRC standards for disaster restoration in residential and commercial properties. We offer best-value pricing, a 100% satisfaction guarantee, and assistance with claims through all insurance carriers. We’re available for emergency services 24/7, 365 days per year, with a 60-minute or less response.