When sewage comes up through the floor drain, it is usually due to a blockage in the sewer system that prevents the water from flowing normally. The floor drain is the lowest point in your sewer system and acts as a safety valve, allowing water to flow up there only when a blockage occurs. This is a sign that you need to act quickly to avoid major damage and health risks.
What does it mean when wastewater comes up through the floor drain?
When water flows up through the floor drain, it signals that the sewage system cannot handle the water to be drained. This happens because a blockage somewhere in the pipe system creates an overpressure that forces the water to find the easiest way back, which is through the lowest floor drain in the building.
Your sewerage system is designed as a network of pipes where all wastewater from dishes, showers, toilets and washing machines flows down the same system. The floor drain has an important function as a safety valve. When a blockage occurs further down the system and the water cannot pass, it will rise in the pipes and exit where the resistance is lowest.
As the floor drain is usually located in the bathroom, laundry room or basement at the lowest level of the property, this is where the water first shows itself when problems occur. It is the property's way of alerting you that something is not working properly in the drainage system. The water that comes up can contain anything from soap scum to more unhygienic wastewater, depending on where in the system the blockage is.
What should I do immediately when sewage starts coming up?
Stop using all water in the property immediately. Do not flush the toilet, use the shower, dishwasher or washing machine. Every liter of water you add to the system will make the situation worse and could lead to major flooding. Turn off running machines such as the washing machine or dishwasher if they are running.
Try to localize where the problem may be. If only one floor drain is affected, the blockage may be localized near that drain. If water comes up in several places at once, or if the toilet also starts bubbling when you use water elsewhere, it indicates a larger blockage in the main line.
You can try to open the floor drain strainer and see if there are visible blockages such as hair or dirt that you can easily remove. Wear gloves and be careful, as the water may contain bacteria. If you have a suction cup or smaller flush pump, you can try to create movement in the water, but avoid aggressive chemicals that can damage the pipes.
Contact professional help if the problem is not resolved quickly. If you have an emergency sewage problem where water keeps backing up or if it is contaminated sewage, you need immediate assistance. We at 24 Center can help you around the clock when you have a sewer blockage or when the floor drain overflows. Call us on 08 40 24 240 and our plumbers will come out quickly to fix the problem.
What causes wastewater to come up through the floor drain?
The most common cause of water coming up through floor drains is the accumulation of hair, soap scum and grease that gradually builds up a blockage in the pipes. Hair from showers and baths easily gets stuck in the drain pipes and creates a base for other materials to stick to. Grease from washing dishes and cooking solidifies in the pipes as it cools down, forming segmental deposits.
Foreign objects accidentally flushed down the drain can also cause blockages. These can range from wet wipes and cotton buds to toys and hygiene items. These get stuck in bends and elbows in the pipe system and obstruct the flow of water.
Roots from trees and bushes outside the property can enter the sewer pipes through small cracks. Once inside, they grow and create serious blockages that require professional clearing. This is particularly common in older properties with clay pipes or in areas with lots of vegetation.
Frost damage can occur in winter when water freezes in the pipes and creates blockages. Incorrect installation or too low a slope of the sewer pipes can also cause water not to flow properly, leading to build-up and blockages over time.
There is a difference between localized blockages and mainline problems. A local blockage affects only one specific floor drain or sewer, while a mainline problem affects the whole building's sewer system. If several drains stop working at the same time, or if neighbors have the same problem, it could be a blockage in the common main that requires major action.
How can I prevent wastewater from coming up through the floor drain?
Regular cleaning of floor drains is the most effective way to prevent sewer problems. Clean the floor drain strainer at least once a month by removing hair, dirt and other visible residues. Then flush through with warm water to keep the system clean.
Check the water trap in the floor drain regularly. The water trap is the water-filled bend that prevents odors and gas from the sewer from entering the property. If the floor drain is used infrequently, the water may evaporate and the trap may dry out. Pour a few liters of water every two months into floor drains that are not used frequently.
Be careful what you put down the drain. Never flush cooking fat, coffee grounds, wet wipes or hygiene products down the drain. Grease should be poured into a jar and thrown in the trash once it has solidified. Use hair traps in the shower and bath to prevent hair from reaching the drains.
Avoid using harsh chemicals for drain cleaning regularly, as they can damage pipes over time. If you need to clean the drains, use enzymatic products that break down organic matter without being as aggressive.
Have the sewer system professionally inspected every three to five years, especially in older properties. A camera inspection can detect problems such as roots, cracks or malfunctions before they become acute. This is especially important if you have trees near the sewer pipes or if the property is older than 30 years.
Keep in mind that preventive maintenance is always cheaper than emergency repairs. By keeping your sewer system clean and avoiding loading it with inappropriate materials, you reduce the risk of experiencing sewer problems floor drain in the future. If you are unsure about the condition of your sewer system, we can help you with inspection and advice to ensure everything is working properly.
