What Is the Difference Between a Sewer Inspection and a Plumbing Inspection?
Written by Steven Shipler, Texas Licensed Master Plumber, Responsible Master Plumber (RMP), MBA.
One of the most common misunderstandings among first-time home buyers is believing that a plumbing inspection automatically includes a sewer inspection.
In most cases, it does not.
A plumbing inspection and a sewer inspection are two separate evaluations that examine different parts of a property’s plumbing system.
Understanding the difference can help buyers avoid expensive surprises after closing.
A plumbing inspection primarily evaluates visible plumbing components inside and around the home. A sewer inspection evaluates the underground sewer line that carries wastewater from the home to the city sewer system.
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Don’t assume the sewer line has been inspected. Schedule a professional sewer camera inspection before closing.
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What Is a Plumbing Inspection?
A plumbing inspection focuses on the visible and accessible plumbing components of the property.
Depending on the inspection scope, a plumbing inspection may evaluate:
- Water heaters
- Water supply lines
- Visible drain piping
- Toilets
- Sinks
- Showers and tubs
- Faucets
- Garbage disposals
- Hose bibs
- Gas piping
- Water pressure
- Leak indications
- Fixture operation
The inspector is generally evaluating how the plumbing system operates at the time of the inspection.
What Is a Sewer Inspection?
A sewer inspection specifically examines the underground sewer lateral that carries wastewater away from the property.
A professional sewer camera is inserted into the sewer line through a cleanout or other approved access point.
The camera records the interior condition of the pipe.
This inspection helps identify problems that cannot be seen during a standard plumbing inspection.
What Can a Sewer Inspection Find?
- Tree root intrusion
- Sewer bellies
- Standing water
- Pipe separations
- Offset joints
- Cracks
- Broken pipe sections
- Collapsed pipe
- Cast iron deterioration
- Grease buildup
- Construction debris
- Improper slope conditions
A house can pass a plumbing inspection and still have major sewer line defects underground.
Why Home Inspectors Usually Do Not Inspect the Sewer Line
Most general home inspections do not include a camera inspection of the sewer line.
The underground sewer system is typically outside the scope of a standard home inspection unless a specialized sewer inspection is ordered separately.
This is why many buyers discover sewer problems only after moving into the home.
Side-by-Side Comparison
| Inspection Type | What It Covers |
|---|---|
| Plumbing Inspection | Visible plumbing fixtures, water heaters, supply lines, drains, leaks, and plumbing operation |
| Sewer Inspection | Underground sewer pipe condition using a professional sewer camera |
Do You Need Both Inspections?
For many home buyers, the answer is yes.
The plumbing inspection evaluates the plumbing system that you can see.
The sewer inspection evaluates the sewer system that you cannot see.
Together they provide a more complete picture of the property’s plumbing condition.
What Equipment Is Used During a Sewer Inspection?
Professional sewer inspections utilize specialized equipment designed for underground sewer systems.
- RIDGID SeeSnake Camera System – High-definition sewer camera inspection.
- RIDGID SeekTech SR-20 Locator – Locates underground sewer defects.
- RIDGID ST-305 Transmitter – Traces underground sewer routes and pipe locations.
Plano Home Buyers
Many older Plano homes contain cast iron sewer systems, mature trees, and aging infrastructure. A sewer inspection often reveals issues that are not visible during a standard plumbing inspection.
McKinney Home Buyers
McKinney buyers frequently encounter long sewer runs, settlement-related concerns, and mixed pipe materials that benefit from camera inspection before closing.
Frisco Home Buyers
Even newer Frisco homes can experience construction-related drainage issues, standing water, and improper slope conditions that may only be identified through a sewer inspection.
When Should a Sewer Inspection Be Scheduled?
The best time to schedule a sewer inspection is during the option period or due diligence period before closing on the property.
This allows buyers to review findings, obtain repair estimates, negotiate repairs, request credits, or make informed decisions before becoming responsible for the property.
What The Sewer Inspection Company Provides
- Sewer camera inspections
- Master Plumber review
- Narrated YouTube videos
- Written sewer inspection reports
- Home buyer inspections
- Commercial inspections
- Investor inspections
- Defect locating services
- Cast iron sewer evaluations
Final Answer: What Is the Difference Between a Sewer Inspection and a Plumbing Inspection?
A plumbing inspection evaluates the visible plumbing system, including fixtures, water heaters, supply piping, and drainage components.
A sewer inspection evaluates the underground sewer lateral using specialized camera equipment to identify defects such as roots, bellies, offsets, cracks, separations, and collapses.
For most home buyers, both inspections provide valuable information, and one does not replace the other.
If you are buying a home, do not assume the sewer line has been inspected unless a dedicated sewer camera inspection has actually been performed.
Schedule Your Sewer Inspection Today
Buying a home? Protect yourself from hidden sewer problems.
972-333-5448
Master Plumber Certified Report + Narrated YouTube Video Included.
Know What’s Underground, Before You Buy.
IPC & UPC Plumbing Code References
| Reference | Topic |
|---|---|
| IPC Chapter 7 | Sanitary Drainage Systems |
| IPC 704 | Drainage Slope Requirements |
| IPC 706 | Drainage Fittings |
| IPC 708 | Cleanouts |
| IPC 715 | Backwater Valves |
| UPC Chapter 7 | Sanitary Drainage |
| UPC 707 | Cleanouts |
| UPC 708 | Drainage Slope |
| UPC 710 | Drainage System Design |
| UPC Chapter 11 | Storm and Building Drainage |