How to Read a Sewer Camera Inspection Report.
Your plumber handed you a camera report. Now what? This guide translates the findings, codes, and annotations into decisions — what's urgent, what can wait, and what to start budgeting for.
WHY THIS MATTERS
A Camera Report Is Only Useful If You Can Read It.
A sewer camera inspection produces a video file, a set of annotated screenshots, and a written report with findings. The video shows what the inside of the pipe looks like. The report tells you what the findings mean. But most reports are written for plumbers, not property managers — full of condition codes, NASSCO grades, and repair recommendations that assume you know the difference between a Grade 3 offset and a Grade 5 collapse.
This guide covers the eight most common camera inspection findings in commercial buildings, what each one actually looks like, how urgent it is, and what the repair or remediation options are. So the next time a plumber hands you a report, you'll know whether you're looking at a $500 problem or a $50,000 one.
THE 8 MOST COMMON FINDINGS
What Your Camera Report Is Telling You.
Each finding below includes the severity level (Critical / Moderate / Monitor), what it looks like on camera, what causes it, and what the repair options are.
Act Now
Pipe Collapse or Structural Failure
NASSCO: Broken (BRK) / Collapsed (CC)
The pipe wall has failed. On camera, you'll see the pipe cross-section deformed — flattened, cracked open, or with soil visible through the break. Flow may be partially or fully blocked. This is the endgame of cast iron graphitization, root damage, or soil movement. There's no repair option — only replacement of the failed section.
Action: Emergency excavation and pipe replacement. Get a second camera run to define the full extent of the failure before the contractor starts digging.
Act Now
Root Intrusion — Active, Heavy
NASSCO: Roots — Heavy (RFH / RTH)
Tree roots have entered the pipe through joints or cracks and are actively growing inside the line. On camera, they look like hair or fingers reaching into the flow channel. Heavy root intrusion can block 50–90% of the pipe diameter. Roots don't retreat — they expand. Once inside, they accelerate joint failure and attract debris that causes full blockages.
Action: Hydro-jet to clear, then re-camera to assess joint condition underneath. If joints are compromised, relining or spot repair required to prevent re-entry.
Schedule Repair
Joint Offset or Separation
NASSCO: Joint Offset (JOL / JOM) / Joint Separated (JSL / JSM)
The pipe sections have shifted at a joint — one section is higher or lower than the adjacent section, or there's a visible gap between sections. On camera, you'll see a "lip" or "step" at the joint, or daylight (soil) visible through the gap. Minor offsets (under 1/4 pipe diameter) may be stable. Larger offsets catch debris, accumulate grease, and become chronic blockage points.
Action: Minor offsets — monitor with annual camera. Moderate or growing offsets — schedule relining or point repair before the offset becomes a collapse point.
Schedule Repair
Belly or Sag (Negative Grade)
NASSCO: Sag (SAG)
A section of pipe has settled below the normal grade line, creating a low spot where water pools instead of flowing. On camera, the water level rises as the camera enters the sag and falls as it exits. Bellies cause slow drainage, sediment accumulation, and standing water that accelerates pipe corrosion. In grease lines, a belly is a guaranteed blockage point.
Action: Mild sags may be managed with more frequent jetting. Severe bellies require excavation and re-grade of the affected section.
Plan & Budget
Graphitization / Corrosion (Cast Iron)
NASSCO: Corrosion (CL / CM / CH)
The pipe wall is deteriorating from the inside. On camera, cast iron graphitization appears as rough, flaky, dark surfaces — the iron has converted to graphite and the structural strength is gone even though the pipe looks intact. Probing with the camera head may reveal soft spots. This is the most deceptive finding — the pipe looks "fine" from the outside while losing structural integrity inside.
Action: Budget for replacement or relining. Get a condition grade across the full run to prioritize which sections are closest to failure. Don't wait for collapse.
Plan & Budget
Grease Buildup / FOG Deposits
NASSCO: Deposits — Grease (DAG)
Solidified fats, oils, and grease coating the pipe walls, reducing the effective diameter. On camera, it appears as a white or yellowish waxy buildup narrowing the flow channel. Common in restaurant and food service lines. Indicates inadequate grease trap maintenance or improper disposal practices upstream.
Action: Hydro-jet to clear. Review grease trap service frequency — if this is recurring, the service interval is too long or the trap is undersized.
Track Over Time
Root Intrusion — Light / Tap Roots
NASSCO: Roots — Fine/Light (RFF / RTF)
Small, hair-like roots visible at joints but not significantly reducing flow. On camera, they appear as thin white tendrils at joint lines. This is the early stage — the roots have found the moisture and are starting to enter. Flow is not yet affected, but the joint seal is compromised and intrusion will worsen over time.
Action: Document location and re-inspect in 6–12 months. Consider root treatment or joint sealing if progression is observed.
Track Over Time
Scaling / Mineral Deposits
NASSCO: Deposits —Ite (calcium) (DAI)
White or light-colored mineral deposits (calcium carbonate) on the pipe interior, typically at joints or on cast iron surfaces. On camera, it looks like a crusty white coating. Common in hard water areas throughout Southern California. Light scaling is cosmetic. Heavy scaling reduces flow capacity and can mask cracks or corrosion underneath.
Action: Light scaling — note and monitor. Heavy scaling — descale with mechanical cleaning, then re-camera to assess pipe condition underneath.
FROM FINDING TO OUTCOME
What the Camera Shows — and What the Repair Delivers.
Before — Camera Finding
- Root intrusion blocking 60%+ of pipe diameter
- Joint offsets allowing groundwater infiltration
- Grease buildup narrowing effective flow
- Belly collecting standing water and debris
- Graphitization visible as soft, dark pipe walls
After — Post-Repair Verification
- Full bore restored — no obstructions on re-camera
- Joints sealed with CIPP lining or new connections
- Clean interior walls with no residual buildup
- Proper grade restored — no standing water
- Documented before/after footage for owner records
DECISION MATRIX
Finding → Severity → Action → Budget Range.
Use this table to convert camera findings into a prioritized action plan. Budget ranges are for typical commercial properties in Southern California — actual costs vary by pipe size, depth, access, and extent.
What did the camera find?
Structural Failure
Collapse, severe crack, or broken pipe. No lining option. Immediate excavation required.
CriticalHeavy Roots / Offset
Major root mass or joint shift. Jet to clear, then CIPP reline to seal. Schedule within 2 weeks.
CriticalCorrosion / Grease / Belly
Graphitization, buildup, or pipe settling. Not emergency — but needs action this budget cycle. 90 days.
ModerateLight Roots / Scaling
Minor presence. Not affecting flow. Note in report and re-camera in 6–12 months to track progression.
Monitor| Finding | Severity | Timeline | Typical Repair | Budget Range |
|---|---|---|---|---|
| Collapse / Structural Failure | Critical | Immediate | Excavation & replacement | $8,000–$30,000+ |
| Heavy Root Intrusion | Critical | Within 2 weeks | Hydro-jet + reline joints | $2,000–$12,000 |
| Joint Offset / Separation | Moderate | Within 90 days | Point repair or relining | $1,500–$6,000 |
| Belly / Sag | Moderate | Within 90 days | Excavation & re-grade | $3,000–$15,000 |
| Graphitization / Corrosion | Moderate | Budget cycle | Relining or full replacement | $10,000–$80,000+ |
| Grease Buildup | Moderate | Within 30 days | Hydro-jet + grease program | $400–$2,000 |
| Light Root Intrusion | Monitor | Re-inspect 6–12 mo | Root treatment / joint seal | $500–$2,000 |
| Scaling / Mineral Deposits | Monitor | Re-inspect 12 mo | Mechanical descaling | $300–$1,200 |
Budget ranges based on California Coast Plumbers' commercial project history across Orange County, LA County, Riverside, San Bernardino, and San Diego. Actual costs vary by pipe diameter (4"–12"+), depth, access conditions, and length of affected run.
QUESTIONS TO ASK YOUR PLUMBER
Six Questions That Turn a Camera Report Into an Action Plan.
When your plumber delivers the report, don't just file it. Ask these questions — the answers determine whether you're managing a system or waiting for a surprise.
Question 1
"What's the most urgent finding, and what happens if I wait 6 months?"
Forces the plumber to prioritize and quantify the risk of delay. The answer tells you whether this is a next-week problem or a next-year budget item.
Question 2
"What pipe material am I looking at, and how old is it?"
Material and age determine the failure timeline. Cast iron from the 1960s has a different prognosis than PVC from 2005. This question frames the entire capital conversation.
Question 3
"Is relining an option, or does this require excavation?"
Relining (trenchless) costs 30–60% less than excavation and causes minimal disruption. But it's not always possible — collapsed pipe, severe offsets, and bellies typically require dig-and-replace.
Cost Comparison
30–60%
less than excavation. A $350 camera inspection today can determine whether a $12,000 reline is still an option — or whether you're already past the point of no return.
Question 4
"How does this compare to the last inspection?"
If this is a repeat inspection, the comparison is more valuable than the individual findings. Stable conditions mean you're managing. Progressive deterioration means you're on a countdown.
Question 5
"What should I budget for the next 1, 3, and 5 years?"
A good plumber can give you a rough capital forecast based on the camera findings. You need this for reserve planning, board presentations, and investor reporting.
Question 6
"When should we camera again?"
The re-inspection interval depends on what was found. Critical findings may need 90-day follow-up. Stable systems may only need annual checks. This sets your monitoring cadence.