Diagnose sewer line problems with camera inspection. Understand repair options: mechanical clearing, spot repair, trenchless, or full replacement. Know permit and code requirements.
Key Takeaways
Why This Matters on the Exam
Sewer line problems are expensive nightmares. I've seen repairs run $3,000 to $30,000 depending on what's wrong and how deep it is. The C-36 exam tests your ability to diagnose the problem, understand your options, and know the code requirements. Proper diagnosis prevents unnecessary work and saves the customer money—which also protects your reputation.
What You Must Know
You identify sewer line problems by symptoms (multiple drains backing up, sewage smell, wet yard). You diagnose with a camera. You repair with one of several options: mechanical clearing, root removal, spot repair, trenchless repair, or full replacement. Every option has trade-offs. And permits and inspections are mandatory for major work.
Each decision impacts cost, timeline, and long-term system health.
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Camera inspection (CCTV) costs $300–$600; essential diagnostic before committing to major repairs to identify cracks, roots, blockages, and structural damage.
California code requires cleanouts at base of vent stack, where line changes direction 45+ degrees, and at property line; caps must be gas-tight.
Mechanical clearing ($200–$500) is temporary; roots regrow and grease re-accumulates within weeks/months without permanent repair.
Root removal plus chemical treatment ($400–$800) prevents regrowth for 1–3 years; permanent solutions are spot repair ($2,000–$5,000) or full replacement ($8,000–$30,000+).
Trenchless repair (CIPP, pipe bursting) costs $3,000–$7,000; avoids excavation but more expensive than spot repair; requires specialized equipment.
Sewer line repair or replacement requires permit in California; inspector verifies pipe material (PVC standard), proper slope (minimum 1/4 inch per foot for pipes 3 inches or smaller), joints, and accessible cleanouts.
PVC Schedule 40 or SDR 35 is code-approved material for gravity sewer lines; cast iron, clay tile, and orangeburg must be replaced with PVC per California code.
Multiple drains backing up simultaneously indicates main sewer line problem (not branch); single drain backup suggests branch line or partial blockage.
Wet yard spots or unusually lush grass over sewer line indicate sewage leakage from cracks or root intrusion; camera confirms location and severity before repair selection.
Transition couplings connect different pipe materials (cast iron to PVC); must be accessible for future replacement per code requirements.