The short answer
Clogs from Daily Use
The most common cause is a clog built up inside the pipe. Grease, oil, and soap scum stick to the walls over time, narrowing the passage. Flushing wipes, paper towels, or feminine products can create a solid blockage that stops water flow completely.
Hair and food scraps also contribute, especially in older homes with narrower pipes. A slow drain is often the first warning sign. If you notice gurgling sounds or water backing up in multiple fixtures, the line may already be partially blocked.
- Grease and oil poured down drains
- Flushable wipes that do not break down
- Paper towels and hygiene products
- Hair and soap scum buildup
- Food scraps and coffee grounds
Tree Root Intrusion
Tree roots naturally seek out moisture, and sewer lines are a steady source. Roots can enter through tiny cracks in the pipe, then grow and expand, eventually blocking the flow. This is more likely in older clay or cast iron pipes, but modern PVC can still be damaged.
Root intrusion often causes recurring backups, even after clearing. The roots can crush or crack the pipe further, leading to leaks and sinkholes in your yard. If you have large trees near your sewer line, this is a likely culprit.
- Roots enter through existing cracks
- Clay and cast iron pipes are more vulnerable
- Recurring clogs despite cleaning
- Soggy patches in the yard above the line
- Slow drainage in multiple fixtures
Pipe Damage and Collapse
Sewer lines can shift, crack, or collapse due to ground movement, heavy vehicles driving over them, or simply age. A collapsed pipe blocks the flow completely, causing sewage to back up into your home. Misaligned joints also let soil and debris enter the line.
Corrosion inside metal pipes can create rough surfaces where clogs form. In some cases, the pipe may separate at a joint, allowing groundwater and roots to enter. This type of damage often requires a professional inspection to locate and assess.
Heavy Rain and Flooding
In many areas, stormwater and sewage share the same municipal system. During heavy rain, the system can become overwhelmed, forcing sewage backward into homes. This is more common in low-lying neighborhoods or older systems with limited capacity.
If your backup happens during or after a storm, the cause may be outside your property. Check your floor drains and lower-level fixtures first. You can reduce risk by installing a backwater valve, but that requires a plumber and local permits.
What to Do After a Backup
Act quickly to limit damage. Stop using water in the home, and avoid flushing toilets. If water is present, keep everyone away from the area, as sewage contains harmful bacteria. Open windows for ventilation, and contact the pros for a thorough cleanup.
A backup often involves contaminated water, so drying alone is not enough. The pros assess the extent, remove affected materials, and sanitize the area. If you live in Mesa, keep your shutoff valve location written down for future emergencies. Water damage from a sewer backup can affect walls, floors, and belongings, so professional help is usually needed.
- Shut off water to the home
- Avoid contact with sewage water
- Ventilate the area
- Call the pros for cleanup and sanitizing
- Check with your insurance company about coverage
Need help right now?
Phones are answered 24/7 for Mesa and nearby communities.
Call Now (480) 898-4279Frequently asked questions
How can I tell if my sewer line is backing up?
Look for gurgling sounds from drains, slow drainage, or water backing up in the bathtub or toilet. A foul odor from drains or a soggy spot in the yard can also signal a problem. These signs often appear before a full backup occurs.
Can I fix a sewer line backup myself?
Minor clogs near the fixture may be cleared with a plunger or a drain snake. But if multiple fixtures are affected, the blockage is likely deeper in the main line. Attempting to fix it yourself can cause damage, so calling the pros is safer and more effective.
Will my insurance cover sewer backup damage?
Policies vary, and your insurer decides what is covered. Some policies include sewer backup coverage as an add-on, while others exclude it. Check your policy documents and contact your insurance company to understand your specific coverage before a backup happens.