Drain & Sewer Emergency
Sewage Backing Up Into Your Home? Stop Using Water Now.
A sewer backup is one of the most serious plumbing emergencies a homeowner can face. Raw sewage carries bacteria and pathogens. Here's exactly what to do in the next 15 minutes.
Do This Right Now
- 1Stop using ALL water in the house — no flushing, no sinks, no washing machine
- 2Keep children and pets away from the affected area
- 3Open windows for ventilation — sewage gas is hazardous
What's Going On
Understanding the Problem
A sewer backup means the main line carrying wastewater away from your home is blocked or overwhelmed. When there's nowhere for the water to go, it reverses course and comes up through the lowest drain openings in your home — typically floor drains in the basement (in homes that have them), first-floor toilets, or bathtub drains. In Houston, sewer backups can be caused by root intrusion, collapsed pipes beneath the slab, heavy rain events that overwhelm the municipal sewer system, or accumulated grease in the main line.
Diagnosis
Common Causes
1Tree root intrusion in the main sewer line
This is the leading cause of sewer backups in established Houston neighborhoods. Mature oaks, magnolias, and the crape myrtles that line nearly every street send roots searching for moisture. They find it inside sewer lines, entering through cracks or loose bell-and-spigot joints and growing until the pipe is effectively plugged. Clay tile sewer lines from homes built before the 1970s are especially vulnerable.
2Grease accumulation in the main line
Years of cooking grease poured down kitchen drains eventually coats the inside of the main sewer line. The line narrows progressively until a heavy flow of water — a full load of laundry, multiple people showering — can no longer pass through. This type of backup often starts as consistently slow drains throughout the house before becoming a full backup.
3Collapsed or offset pipe beneath the slab
Houston's expansive clay soil shifts seasonally with wet and dry cycles, and that movement puts pressure on the cast iron or clay drain lines buried beneath slab foundations. Over time, pipes can crack, offset at joints, or partially collapse. A collapsed section acts as a dam — water backs up behind it. This requires camera inspection to confirm and typically involves either pipe lining or excavation to repair.
4Municipal sewer system surcharge during heavy rain
During major rain events, Houston's combined sewer and storm system can become overwhelmed with stormwater. This hydraulic pressure can push back into residential sewer lines — especially in older neighborhoods where the private sewer lateral connects to an older, lower-elevation main. If multiple homes on your block are experiencing backup simultaneously after heavy rain, this is likely the cause.
5Flushed non-flushable items
'Flushable' wipes, paper towels, feminine hygiene products, and similar items do not break down in the sewer system the way toilet paper does. They accumulate and bind together — plumbers call the resulting mass a 'rag ball' — and can block the main line completely.
DIY Troubleshooting
What You Can Try
Stop all water use in the house immediately
Do not flush toilets, run sinks, start the dishwasher, or run laundry. Every gallon of water you add to the system has to go somewhere, and right now there's nowhere for it to go except back into your home. This is the single most important thing you can do in the first few minutes.
Identify the affected fixtures and keep people away
Raw sewage contains harmful bacteria including E. coli and other pathogens. Keep children and pets away from any area where sewage has surfaced. Do not attempt to clean up sewage backup without proper protective gear — gloves, eye protection, and clothing you can discard.
Check if the cleanout cap is accessible
Most Houston homes have a sewer cleanout — a capped pipe, usually a 4-inch diameter white or black PVC cap, located in the yard between the house and the street, or sometimes inside a utility closet. If sewage is backing up, sometimes the pressure can be relieved by carefully removing the cleanout cap to give the blockage somewhere to go besides your fixtures. Use a wrench and stand to the side — there may be pressure behind it.
Document the damage for insurance purposes
If sewage has backed up into living areas, take photos and video before any cleanup. Most homeowners insurance policies do not automatically cover sewer backup, but many offer it as an endorsement. Your documentation will be critical if you file a claim.
Call a plumber — do not attempt to clear the main line yourself
A main line backup requires a professional-grade rooter machine or hydro-jetter to clear, plus a sewer camera inspection to identify the underlying cause. Over-the-counter drain snakes are not long enough or powerful enough to reach and clear a main line blockage.
Know When to Call
When to Call a Pro
A sewer backup is always an emergency. Call ARG Plumbing at (832) 419-3411 immediately. Do not wait to see if it resolves on its own — it won't. The longer sewage sits in your drain lines or on your floors, the more contamination spreads and the more expensive the remediation becomes. We carry the equipment to clear main line blockages, run a camera to find the cause, and get your drains flowing again quickly.
Pro Tip
Have your main sewer line camera-inspected every 5–7 years if you live in a Houston home built before 1985. The cast iron or clay lines in older Houston neighborhoods are at or past the end of their service life. A $200 inspection can tell you exactly what's in your pipes before a $10,000 backup repair and remediation job tells you the hard way.
Hristo
Master Plumber · ARG Plumbing