If septic sewage is backing up into your house in Apex, stop using water immediately. Do not flush toilets, run sinks, shower, wash laundry, or use the dishwasher. Keep children and pets away from the affected area, avoid direct contact with sewage, and arrange a septic or plumbing inspection. If you can do so without entering contaminated water, shut off fixtures that are leaking or running. Do not open the septic tank or try to enter it.
What should you do first when septic sewage enters the house?
Treat an indoor sewage backup as both a plumbing emergency and an exposure hazard. The next gallon sent down a drain may become the next gallon on the floor, so household water use needs to stop before anyone tries to diagnose the cause.
- Stop all water use. Tell everyone in the home not to flush, shower, run faucets, or use water-using appliances.
- Block access to the area. Keep children, pets, and anyone who does not need to be there away from sewage and contaminated materials.
- Avoid electrical hazards. Do not step into standing sewage to reach a breaker, appliance, extension cord, or outlet. Call an electrician or emergency service if water is near live electrical equipment.
- Call for a diagnosis. A septic provider may need to inspect the tank, effluent filter, pump equipment, and drainfield. A plumber may need to inspect the building sewer or an indoor branch line.
- Document the damage. Take photographs from a safe location and contact your insurer before discarding damaged materials if your policy requires notice.
The EPA says sewage from plumbing fixtures or an onsite system may contain harmful pathogens. It advises avoiding contact, contacting the local health department or regulatory agency for guidance, and using protective clothing during cleanup. [1]
How can you tell whether the problem is septic or indoor plumbing?
No single symptom proves the cause, but the pattern can help the service provider decide where to start. A backup in one fixture often points to a local branch-line clog. Trouble across several fixtures, especially at the lowest drains in the house, points farther downstream.
- One sink or tub is affected. A trap or branch line may be clogged while the rest of the system still drains normally.
- Several fixtures are slow or gurgling. The restriction may be in the building sewer, septic tank inlet or outlet, filter, pump system, or drainfield.
- The lowest fixture backs up first. A basement drain, low shower, or first-floor toilet may be the first escape point when wastewater cannot leave the house.
- Wet or spongy soil appears outside. Standing wastewater or unusually wet ground near the tank or drainfield supports a system-wide diagnosis.
- The trouble follows heavy rain. Saturated soil, groundwater, or runoff may be limiting how much wastewater the drainfield can accept.
- An alarm is active. A pump, float, control, or high-water condition may need inspection. Silence the audible buzzer only if the panel instructions explain how, and leave the warning light and system controls in place.
EPA lists sewage backing up into home plumbing, several very slow drains, gurgling, standing water near the tank or drainfield, and sewage odors among common signs of a failing septic system. [1] Our guide to signs a septic tank needs pumping explains how these symptoms fit together.
What can cause a septic backup into the house?
A backup means wastewater has met a restriction or a part of the system cannot accept the current flow. Finding that point matters because pumping the tank will not repair every possible cause.
A full tank or accumulated solids
Solids build up even in a working tank. If they are not removed, they can reduce usable tank volume and move toward the outlet or drainfield. NC State Extension explains that solids reaching the drainfield can clog spaces in the gravel and soil, which can lead to sewage backing up indoors or surfacing in the yard. [4]
A clogged pipe, filter, or tank fitting
The building sewer between the house and tank can be blocked by solids, roots, damaged pipe, or items that should not have been flushed. An effluent filter can also clog. The tank inlet or outlet may have an obstruction or damaged fitting. The provider needs access to the right components before deciding what to clear or repair.
A pump or electrical failure
Some systems move wastewater with a pump instead of relying only on gravity. A failed pump, float, control, breaker, connection, or alarm component can leave the pump chamber unable to send wastewater forward. Do not work on wet electrical equipment. Ask the provider to check the complete pumping and alarm circuit.
A saturated or failing drainfield
Soil must accept and treat septic effluent. Heavy rain, flooding, diverted runoff, compacted soil, clogged distribution pipes, or long-term solids loading can reduce that capacity. NC State Extension notes that excess indoor water and runoff over the drainfield can overload the system and force sewage back into the house or onto the ground. [4]
Too much water entering too quickly
A running toilet, leaking fixture, several laundry loads, long showers, or a large gathering can send more water than a strained system can accept. Stopping the flow may prevent more damage, but it does not prove the system is healthy. A backup still deserves inspection.
Will septic pumping stop the backup?
Pumping may create temporary storage in a full tank and may be part of the needed service. It does not clear every building-sewer clog, restore failed electrical equipment, repair a crushed pipe, or make a damaged drainfield absorb wastewater again. The provider should identify why wastewater stopped moving before treating an empty tank as the whole answer.
If the ground is flooded or saturated, pumping can require a different approach. EPA warns that pumping a tank during flooded or saturated drainfield conditions may be temporary and, under some conditions, could damage inlet or outlet pipes or cause the tank to move. The agency advises reducing water use and waiting for appropriate site conditions and professional guidance. [2]
When pumping is appropriate, ask what the crew found before and after the tank was emptied. Our guide to what happens during septic tank pumping covers tank access, solids removal, visible condition checks, and service records.
How should you handle sewage cleanup safely?
Do not begin cleanup while wastewater is still entering the room or while electrical conditions are uncertain. Keep the space closed off and ventilate it when that can be done safely. People with open wounds or health concerns should avoid contaminated areas and ask a health professional for guidance after exposure.
The CDC advises wearing rubber boots, rubber gloves, and goggles when sewage is involved. It also says to keep children and pets away until cleanup is complete, wash exposed skin with soap and water, wash contaminated clothing separately in hot water and detergent, and seek medical attention if you become injured or sick. [3]
Porous materials can be difficult or impossible to sanitize after sewage contact. Carpet padding, drywall, insulation, upholstered furniture, and other absorbent items may need removal. Cleanup methods depend on the affected material, the amount of sewage, local guidance, and product instructions. Never mix bleach with ammonia or another cleaner. If contamination is extensive, use a qualified cleanup company rather than spreading sewage through the home with unprotected equipment.
What should you tell the septic or plumbing provider?
A clear symptom history can shorten the diagnostic process. Tell the provider where the backup appeared first, which fixtures are affected, when the problem started, and whether it followed rain, flooding, a power outage, guests, heavy laundry use, or recent digging. Mention alarms, odors, wet soil, unusually green grass, and any known system damage.
Have these details ready if you know them:
- The date of the last septic pumping and inspection
- The tank size, system type, and number of compartments
- The location of the tank, pump chamber, drainfield, and cleanouts
- Any pump, alarm, effluent-filter, or treatment-unit records
- Recent repairs, landscaping, construction, or vehicle traffic over the system
- Whether a private well or floodwater may have been affected
Do not remove tank lids before the provider arrives. Septic tanks can contain dangerous gases, and an open or damaged lid creates a fall hazard. Keep vehicles and bystanders away from the tank and drainfield.
What should happen before normal water use resumes?
Resume water use only after the blockage or system problem has been identified and the provider says the system can accept flow. Start with limited use and watch the lowest fixtures, alarm panel, tank area, and drainfield. Stop again if drains gurgle, water rises in a fixture, an alarm returns, or wastewater appears outside.
Ask for a written record of the diagnosis and work. It should identify what was inspected, what was pumped or cleared, any damaged or inaccessible components, and the recommended follow-up. Save the receipt with your permit, system drawing, prior service records, and repair documents.
If septic sewage is backing up into your Apex home, stop water use and keep people away from the affected area. For help arranging the next inspection or service step, Call (984) 388-9807.