How to use a drain camera for blocked drains

🔧 Using a Drain Camera for Blocked Drain Diagnostics

Why use a drain camera for blocked drain diagnostics?

A drain camera is one of the most effective diagnostic tools for locating blockages, identifying pipe damage, confirming line condition and reducing unnecessary excavation. For Australian plumbing contractors, camera inspections are a high-value service that supports blocked drain callouts, pre-purchase inspections, maintenance reporting and post-clearing verification.

Plumbing work in Australia must be performed by a licensed plumber. This guide explains the process and helps you select the right tools and materials. Drain inspection and diagnostic work should be carried out in accordance with the PCA and relevant provisions of AS/NZS 3500, with licensing requirements applying through NSW Fair Trading, VIC VBA, QLD QBCC and the WA Building Commission.

What skill level is required for drain camera operation in Australia?

Advanced — Estimated time: 1–3 hours depending on drain access, line condition, blockage severity and reporting requirements

What specific tools are required for professional drain camera inspections in Australia?

Materials Required

Safety Requirements

Step-by-Step Guide

Step 1: Assess the drainage system and select the correct access point

Start by confirming whether the blockage is likely in sanitary drainage, stormwater or a combined downstream section. Speak with the client or site representative to identify symptoms such as gurgling fixtures, overflow gully surcharge, slow discharge, repeated backups or external ponding.

Choose the best entry point for the inspection, typically an IO, ORG, boundary trap, upstream maintenance shaft or downstream access chamber. The aim is to enter the line with the least number of bends and the best chance of reaching the suspected obstruction.

Check the likely pipe size before selecting the camera head. Common Australian drain sizes include 50 mm, 65 mm, 80 mm, 90 mm, 100 mm and 150 mm. Fit the appropriate skid or guide so the camera remains centred and delivers a clearer image, particularly in larger diameter pipes.

Step 2: Prepare the line before inserting the camera

If the drain is fully surcharged or full of solids, the camera image may be unusable until flow is reduced. In many cases, carry out an initial clear with a jetter or drain machine to restore partial flow before undertaking the diagnostic run.

Where the purpose is fault diagnosis before clearing, insert the camera carefully into the backed-up line and assess water level, obstruction type and pipe condition. Be aware that completely submerged inspection often limits visibility, particularly in greasy kitchen waste lines or silted stormwater drains.

Set up the camera control unit on stable ground, confirm battery level or mains power supply, zero the distance counter and test video recording before starting the inspection.

Step 3: Inspect systematically and control the push rate

Feed the camera into the drain slowly and steadily, avoiding excessive force through junctions and bends. A controlled push rate gives a clearer image and makes it easier to identify transitions, intrusions and changes in grade.

Watch for common blockage causes including:

Pause frequently to orient the image, note the pipe material and confirm fitting type. Typical line materials may include earthenware, PVC-U, HDPE or cast iron. Record footage continuously if the inspection is for client reporting, insurance evidence or defect documentation.

Step 4: Locate and mark the defect from the surface

Once a blockage, crack, root mass or junction is identified, stop the camera head and activate the sonde if fitted. Use the locator above ground to trace the line and pinpoint the position and approximate depth.

Mark the surface clearly with paint or flags and cross-check the distance counter on the camera reel. This is critical where excavation, patch repair, relining or section replacement may follow.

Take note of offsets, grade changes and proximity to structures, slabs, retaining walls or other underground services. Accurate location reduces unnecessary excavation and improves quoting accuracy.

Step 5: Identify the defect type and determine the repair method

Interpret the camera findings in practical repair terms, not just visual observations. For example, distinguish between:

A blocked line with intact structure may only require jetting and maintenance scheduling. A line with repeated root ingress may need section replacement, mechanical root cutting plus herbicide program where permitted, or trenchless rehabilitation. A collapsed 100 mm sewer drain will generally require excavation and replacement rather than repeated clearing.

Step 6: Reinspect after clearing or repair preparation

After jetting or mechanical clearing, run the camera again to verify the line condition. This step is essential because many drains appear “cleared” hydraulically while still having residual roots, cracks, open joints or deformed sections that will cause repeat blockages.

Inspect the full available length, not just the original obstruction point. Look for secondary defects downstream such as flat grades, broken junctions or debris at property connection points.

For maintenance clients, this post-clear verification is often the value-add that justifies the camera service and supports recommendations for ongoing programmed cleaning.

Step 7: Record findings and produce a trade-grade report

Capture still images and video clips of all relevant defects, including the distance reading and surface location reference. Your report should state:

For insurance, strata, body corporate or commercial maintenance jobs, include a simple site sketch showing line direction, defect position and nearby structures. Good reporting improves approval time for repair work and reduces disputes.

Step 8: Clean, disinfect and store equipment correctly

Withdraw the camera carefully, cleaning the push rod as it returns to the reel. Disinfect the camera head, cable and accessories after use, especially after sewer inspection.

Inspect the push rod for cuts, kinks or sheath damage, and check the camera lens and lights for contamination. Replace worn skids, recharge batteries and store the unit dry and protected from impact.

Proper maintenance extends the life of high-value inspection equipment and reduces failures on urgent blocked drain callouts.

Common Mistakes to Avoid

Pro Tips

Recommended Tools

🔒 Licensing: Plumbing diagnostic and drainage work in Australia must be undertaken by a licensed plumber, with licensing administered by NSW Fair Trading, VIC VBA, QLD QBCC and the WA Building Commission.