Can a Sewage Leak Under My House Cause Illness?
Last updated October 28, 2026
The short answer
Health Risks from Sewage
Sewage is a mix of water, human waste, and household chemicals. It harbors pathogens like E. Coli, Salmonella, and hepatitis A virus. When a leak happens under your house, these contaminants can seep into the soil and spread through the air, especially if the space is enclosed. Breathing in contaminated air or touching affected surfaces can make you sick.
Symptoms of exposure may include nausea, diarrhea, fever, and respiratory irritation. People with weakened immune systems, children, and the elderly are more vulnerable. If you or anyone in your home feels unwell after a sewage leak, see a doctor. The risk is real, and taking the leak seriously is the first step.
Signs of a Sewage Leak
You might notice a strong, foul odor that smells like rotten eggs or waste. This smell can be the first clue that sewage is leaking under your house. Other signs include damp spots on floors or walls, unexplained puddles in crawl spaces, or an increase in pests like flies or rodents. These indicators point to a problem that needs attention.
If you suspect a leak, do not ignore it. The longer sewage sits, the more it can soak into wood, drywall, and insulation. That makes cleanup harder and raises health concerns. Check areas near plumbing fixtures, such as toilets and drains, and look for cracks in pipes. Early detection helps limit damage.
- Strong sewage odor inside or outside your home
- Damp or stained spots on ceilings, walls, or floors
- Standing water or wet soil in crawl spaces or basements
- Increased presence of flies, cockroaches, or other pests
- Gurgling sounds from drains or toilets when water runs
- Unexplained increase in humidity or musty smells
Immediate Steps to Take
If you find a sewage leak, your first priority is safety. Keep children and pets away from the area. Open windows to ventilate your home, and avoid touching the sewage with bare hands. Turn off the water supply to the affected plumbing if you can do so safely, and shut off electricity in the area if there is standing water. These actions reduce exposure while you arrange for help.
Do not attempt to clean up raw sewage yourself. The mess requires special handling and disinfection. Contact your insurance company to see if your policy covers sewage damage, and ask about cleanup services. Local water damage pros can assess the situation and recommend the right course. Acting quickly is key to preventing further contamination.
- Keep everyone away from the affected area
- Ventilate your home by opening windows and doors
- Turn off water and electricity to the leak site if safe
- Avoid sweeping or wiping up sewage yourself
- Contact your insurance company to discuss coverage
- Call local water damage pros for an assessment
Cleanup and Sanitation
Cleaning up sewage is not a do-it-yourself job. The pros use protective gear, industrial-grade disinfectants, and specialized equipment to remove contaminated materials and sanitize surfaces. They also address the source of the leak, which may involve repairing or replacing damaged pipes. Proper cleanup reduces the risk of illness and prevents mold from growing in the damp aftermath.
The cleanup process typically involves removing soaked materials like carpet, drywall, and insulation. These items cannot be fully cleaned and must be discarded. The affected area is then washed with disinfectants and dried thoroughly. In some cases, structural drying and dehumidification are needed to remove all moisture. The pros know how to handle each step safely.
Preventing Future Leaks
After the leak is resolved, think about what caused it. Clogged drains, tree root intrusion, or aging pipes are common culprits. Regular maintenance can help. Avoid flushing items like wipes, grease, or paper towels that can clog pipes. Have a plumber inspect your sewer line periodically, especially if your home is older.
If you live in Redmond, keep your shutoff valve location written down. Knowing where your main water shutoff is can help you act quickly in an emergency. Also, consider installing a backwater valve to prevent sewage from backing up during heavy rains. These steps reduce the chances of another leak and the health risks that come with it.
Need help right now?
Call (425) 407-5186 any time, day or night, and describe what happened.
Call Now (425) 407-5186Frequently asked questions
How quickly can a sewage leak make you sick?
Symptoms can appear within hours or days after exposure, depending on the pathogen and your sensitivity. If you notice a sewage smell or contact with sewage, it is wise to see a doctor, especially if you develop nausea, diarrhea, or breathing problems.
Can I clean up a sewage leak myself?
No. Cleaning sewage requires protective gear, proper disinfectants, and safe disposal of contaminated materials. Doing it yourself can spread pathogens and increase health risks. The pros have the equipment and training to handle it safely.
Will my insurance cover sewage leak cleanup?
Policies vary, and your insurer decides what is covered. Some policies cover sewage backup, while others do not. Contact your insurance company early to understand your coverage and ask about required documentation.