How to Handle your Basement Drain Backing Up

Don’t panic, follow these steps to avoid permanent damage to your home.

1. Turn Off Water Sources

To prevent further water from entering the drainage system, stop using sinks, showers, toilets, washing machines, and dishwashers.

2. Shut Down the Main Water Supply

If the backup is severe, turning off the main water valve can prevent additional flooding, especially if the issue is caused by a clog in your home’s plumbing rather than the municipal sewer system.

3. Wear Protective Gear

Sewage water contains bacteria, viruses, and other harmful contaminants. Before stepping into the affected area, wear waterproof boots, gloves, and a face mask to protect yourself from harmful pathogens.

4. Assess the Situation Cautiously

If the water is clear and does not have a strong odor, it may just be a minor clog. However, if the water appears dark, smells bad, or contains debris, it could indicate a severe sewer backup that requires immediate professional attention. It’s important to assess if there is any water damage that may need additional repair. 

5. Attempt Basic DIY Solutions (If Safe)

If you suspect a simple clog is causing the issue, try using a plunger or drain snake. However, avoid using chemical drain cleaners, as they can corrode pipes and worsen the problem.

6. Contact a Professional Plumber or Restoration Service

If you cannot determine the cause or if multiple drains in your home are backing up, it’s best to call a professional plumber. A restoration company may also be needed if water damage is extensive.

Common Causes of Basement Drain Backups

1. Clogged Main Sewer Line

A blockage in the main sewer line is one of the most common causes of basement drain backups. Over time, grease, hair, soap scum, food particles, and non-flushable items can accumulate in the pipes, restricting wastewater flow. Eventually, the clog can force water and sewage back into your home through the lowest drain, often the basement floor drain.

2. Tree Root Intrusion

Tree roots naturally seek moisture and nutrients, making sewer pipes a prime target. Small cracks or joints in aging sewer lines provide an entry point for roots, which grow and expand inside the pipes. This intrusion can cause slow drainage, recurring clogs, or a complete blockage, leading to a backup in your basement drain.

3. Deteriorated or Damaged Pipes

Older homes with cast iron or clay pipes are particularly vulnerable to deterioration. Corrosion, cracks, or collapsed sections in the sewer line can restrict water flow, causing backups. In some cases, shifting soil or ground movement can also damage underground pipes, further exacerbating the problem.

4. Improper Drain Installation

If your basement drain or sewer line was not installed correctly, water may not drain efficiently. Poor slope angles, undersized pipes, or incorrect venting can contribute to slow drainage and increased risk of backups.

5. Heavy Rainfall or Sewer System Overload

Municipal sewer systems are designed to handle large amounts of wastewater, but during heavy rain or rapid snowmelt, the system can become overwhelmed. When this happens, excess water can flow backward into homes through floor drains, especially if backflow prevention devices are not in place.

DIY Solutions

1. Use a Plunger for Minor Clogs

A plunger can create suction that may dislodge small blockages in your basement drain. Ensure you have a good seal around the drain opening before plunging vigorously.

2. Pour Hot Water Down the Drain

Boiling water can help dissolve grease, soap scum, and minor clogs. Pour a kettle of hot water slowly down the drain, wait a few minutes, and then flush with cold water. The hot water may also kill any mold or bacteria that may have built up inside the drain.

3. Try a Mixture of Baking Soda and Vinegar

A natural, chemical-free solution involves pouring one cup of baking soda into the drain, followed by one cup of vinegar. Let the mixture sit for 30 minutes before flushing with hot water. The fizzing reaction can help break up minor blockages.

4. Use a Drain Snake for Stubborn Clogs

If plunging and hot water don’t work, a drain snake (or auger) can reach deeper into the pipes to break up debris and dislodge obstructions.

5. Install a Temporary Standpipe During Heavy Rain

A standpipe—a vertical pipe installed in the floor drain—can help redirect water and prevent backups during periods of heavy rainfall.

Conclusion

A basement drain backup is more than just an inconvenience—it’s a potential hazard that can lead to costly repairs and health risks. By understanding the common causes, taking immediate action, and implementing both short-term and long-term solutions, you can protect your home from future backups. While some issues can be resolved with DIY methods, severe backups often require professional intervention. Investing in preventive measures like routine maintenance, pipe upgrades, and backflow prevention devices can save you from future headaches. If you’re currently experiencing a basement drain backup, don’t hesitate to contact First and Last Restoration to assess and resolve the issue efficiently.

 

Picture of Marcellis Mosby
Marcellis Mosby

Marcellis is the Director of Operations at First & Last Restoration. Certified in WRT, ASD, AMRT, FRST, and CDS he is an expert in all things restoration.