Plumbing · Free Template · ~7 steps
Plumbing Leak Diagnosis and Repair Procedure
Plumbing company owners who want a written service call procedure that finds the root cause of leaks instead of treating symptoms.
Free SOP template — copy it, adapt it, or generate a custom version for your business in 5 minutes
Who it's for
Plumber performing a residential leak diagnosis and repair
When to run it
Every residential leak service call
Before you start
- •Service call dispatch with address and complaint description
- •Pipe camera and moisture meter in vehicle
The procedure
Step-by-step, in order. Each step has the action and the reason it matters.
- 1
Locate the water shutoff before touching any plumbing
Before any diagnosis, locate and confirm the main water shutoff is accessible and functional. If the shutoff is seized or inaccessible, address it first. A shutoff that won't close when you need it is a water damage event.
- 2
Identify the source — test before assuming
A wet ceiling does not mean the leak is directly above it — water travels. Use a moisture meter on adjacent surfaces to trace the path. Condensation from HVAC is the most commonly misdiagnosed 'leak.' Verify it is water supply or drain before opening walls.
- 3
Distinguish supply from drain leaks
Supply leaks: present under pressure — visible with water off but active. Drain leaks: only present when water is running. Turn off the supply and watch — if the drip stops immediately, it is a supply leak. If it continues slowly, check drain connections.
- 4
Document findings with photos before opening any wall
Photo the exterior of the area before any wall or floor opening. Photo the actual failure after exposure. These photos are your documentation for the estimate and for the homeowner's insurance claim if they file one.
- 5
Provide written estimate before repair — include all options
Present the repair options in writing: minimum repair (fix only what is actively failing), comprehensive repair (address root cause and related items), and any code upgrade required if the repair triggers an inspection. Let the homeowner choose with the full picture.
- 6
Repair and pressure test
After repair, restore water supply and pressure test the repaired section for 5 minutes under pressure. Check for any weeping at connections. A repair that passes at zero flow can fail under line pressure.
- 7
Verify no moisture remains — use the moisture meter
Check surrounding materials with the moisture meter after repair. Wet drywall or subfloor left behind grows mold. If materials are above 20% moisture content: advise the homeowner that drying is required before the wall is closed.
Verify when done
- ☐Main shutoff located and confirmed functional
- ☐Leak source confirmed with moisture meter (not assumed)
- ☐Written estimate with options provided before repair
- ☐Pressure test after repair — 5 minutes under pressure
- ☐Moisture meter check on surrounding materials
Common mistakes
- ✕Assuming the leak is directly above the visible damage
- ✕Not checking for supply vs drain before opening walls
- ✕No pressure test after repair
- ✕Not checking moisture in surrounding materials
Trainer notes
The 'test before assuming' step is where callbacks originate. A plumber who opens the ceiling below the leak without tracing it first often fixes the wrong section. Use the moisture meter. Trace the path. Open once.
Common questions
Who should run the plumbing leak diagnosis and repair procedure?
Plumber performing a residential leak diagnosis and repair
When should this plumbing procedure be run?
Every residential leak service call
How many steps does the plumbing leak diagnosis and repair procedure have?
7 steps. The procedure starts with "Locate the water shutoff before touching any plumbing" and ends with "Verify no moisture remains — use the moisture meter". Each step in between has the action and the reason it matters.
What's the most common mistake when running this procedure?
Assuming the leak is directly above the visible damage. The 'test before assuming' step is where callbacks originate. A plumber who opens the ceiling below the leak without tracing it first often fixes the wrong section. Use the moisture meter. Trace the path. Open once.
Can I get a custom version written for my plumbing business?
Yes. TalkNDone generates a custom SOP from your voice or text description in about 5 minutes — written using your team's words, your equipment, and your specific procedure. $49 one-time, free preview before you pay, no subscription. Start at talkndone.com.
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