How to Fix a Leaky Pipe: Find the Leak and Repair It

A leaking pipe can damage walls, cabinets, floors, and belongings quickly. The first goal is to stop or contain the water; the next is to make a durable repair appropriate to the pipe material and leak. Before starting, locate the home’s main water shutoff and clear the area. If water is near electrical outlets, appliances, or a breaker panel, do not touch wet equipment—keep clear and contact an electrician or emergency services as appropriate.

What You’ll Need

Bucket, towels, and a flashlight
Adjustable wrench or the correct pipe wrench
Repair clamp or pipe-repair tape rated for the pipe material, water type, and pressure, if making a temporary repair
Replacement fitting or pipe section and compatible supplies, if you have the skills and tools for a permanent repair
Eye protection and work gloves
For a soldered copper repair: suitable copper fittings, lead-free plumbing solder and flux, a torch, and a fire-resistant heat shield; use only if you are trained to work safely with a torch

Do not assume tape, putty, or a clamp is suitable for every pipe. Check the product label for whether it can be used on drinking-water lines and whether it is approved for the pipe material and operating pressure.

Step-by-Step

Make the area safe. Move belongings and place a bucket under the drip. If water is spraying, spreading, or entering a ceiling or wall, avoid the area and shut off the main supply. Never stand in water while touching electrical equipment. If you cannot reach the shutoff safely, call for help.
Shut off the water. For a leak at a sink or toilet, turn the small shutoff valve on the supply line clockwise until it stops; do not force it. For a leak elsewhere, use the home’s main shutoff, commonly near where the water service enters the house or by the meter. If the valve is stuck, broken, or inaccessible, contact a plumber or water utility rather than forcing it.
Relieve pressure and drain the line. Open a nearby cold-water faucet after shutting off the supply. For a hot-water leak, let the pipe cool and open a hot tap cautiously. Catch remaining water in a bucket. If the leak involves a water heater, boiler, fire sprinkler, or other specialized system, follow its instructions and call a qualified technician.
Find the actual source. Dry the pipe and nearby surfaces, then watch for the first place moisture reappears. Water can travel along a pipe or cabinet and drip far from the defect. Check joints, valves, corrosion, pinholes, and cracks. Confirm that the water is coming from the pipe rather than condensation, a drain, or an appliance connection. Do not cut into a wall just because a stain appears there.
Decide whether to DIY. A small, accessible leak on a simple water-supply pipe may suit a temporary clamp while you arrange a permanent fix. A split, badly corroded pipe, leaking joint inside a wall or ceiling, repeated failure, or leak on a gas, heating, fire-sprinkler, or other specialized line calls for a professional. Gas leaks are not plumbing repairs: leave the area and contact the gas utility or emergency services from a safe location.
Apply a temporary clamp if appropriate. With water off and the pipe accessible, clean and dry the surface as directed by the clamp maker. Center the gasket over the leak, position the clamp squarely, and tighten its fasteners evenly to the specified amount. Do not overtighten or use a clamp that does not fit the pipe. Treat this as temporary unless the product is expressly approved as a permanent repair for that application.
Replace damaged pipe or fitting for a lasting repair. If you have the right experience, remove the damaged section only after confirming the line is fully shut off and drained. Use fittings and joining methods approved for that pipe type—copper, PEX, CPVC, and galvanized steel are not interchangeable. Follow the fitting manufacturer’s instructions and local plumbing requirements. If you are unsure how to make a compatible joint, stop and hire a plumber; a poor connection can fail behind a wall.
Restore water slowly and inspect. Close open taps, then reopen the shutoff gradually. Check the repair and nearby joints with a dry paper towel for fresh moisture. Watch the area while the line is pressurized and check again after use. If water appears, shut the supply off again rather than tightening or patching a pressurized connection blindly.
Dry and monitor the area. Remove standing water, dry accessible surfaces, and keep the space ventilated. Check for continuing dampness, odor, or ceiling sagging; these can indicate water remains trapped. Arrange prompt professional help if the leak was concealed or soaked building materials.

Common Mistakes

Using the wrong shutoff: A fixture valve may not control a nearby pipe leak. If it does not stop the flow, shut off the main supply.
Applying a patch to a wet, dirty pipe: Many repair products need a clean surface and may not bond or seal otherwise. Follow the label precisely.
Trusting tape or putty as a permanent fix: These products may only slow a leak, and some are unsuitable for potable water or pressurized lines.
Overtightening fittings: Excess force can crack plastic, deform a gasket, or damage threads. Use the specified method and torque, if provided.
Ignoring water damage: Stopping a drip does not dry a wall cavity or floor. Hidden moisture may continue damaging materials, so investigate and dry affected areas.
Using a flame without precautions: Torch work near wood, insulation, cabinets, or concealed spaces can start a fire. Do not attempt it without appropriate training and fire protection.

Tips

Find and label the main shutoff before an emergency; show household members how to operate it.
Take a photo of the leak and note the pipe material and fitting type before visiting a hardware store or speaking with a plumber.
Use a flashlight and dry tissue to trace tiny leaks. A single drop on a dry surface can reveal where moisture first appears.
Keep a temporary repair accessible for inspection. Do not close a wall or cabinet around an unverified repair.
If a leak has stopped but the pipe is corroded or swollen, arrange an inspection. A patch may conceal a larger weak section.

Troubleshooting

The leak continues after shutting off a fixture valve: The valve may not control that line, or it may have failed. Shut off the main supply and call a plumber if the flow does not stop.

The clamp still drips: The gasket may be off-center, the surface may be unsuitable, or the damage may be too large. Turn off the water again. Do not keep tightening; replace the temporary patch only if the product instructions allow it, or get professional help.

The leak returns when water is restored: A patch may not withstand pressure, or a joint may be cracked. Shut off the supply and arrange a permanent repair. Do not leave a questionable clamp unattended.

You cannot locate the source: Check nearby fixtures and appliance connections, but avoid opening walls or ceilings without knowing what is behind them. If a ceiling is bulging or water is spreading, keep people clear and call a plumber promptly.

The shutoff valve will not turn: Do not use excessive force, which can break the valve or pipe. Use another accessible shutoff if available and contact a plumber to repair or replace the stuck valve.

Frequently Asked Questions

Can I fix a leaky pipe without turning off the water?

A lasting repair generally requires the line to be shut off and depressurized. Some emergency products claim to work on wet pipes, but only use them if their label clearly approves the exact pipe and conditions; they are not a substitute for fixing damaged plumbing.

Is pipe-repair tape a permanent fix?

Usually, it is best treated as a temporary measure unless the manufacturer specifically approves it as a permanent repair for that pipe, pressure, and water use. Check the label and plan a lasting repair if the pipe is damaged.

How do I tell whether the leak is from a pipe or condensation?

Dry the area and watch where moisture first returns. A leak often reappears at a joint, crack, or pinhole, while condensation can form over a broader cold surface. If you cannot tell, have a plumber inspect it.

Should I repair a pipe inside a wall myself?

Usually not unless you are experienced and can identify the pipe and make a code-compliant repair. Water may have damaged hidden materials, and opening a wall can hit wiring or other lines. Call a qualified plumber to locate and repair it.

When should I call a plumber immediately?

Call for major or fast-flowing leaks, hidden pipe damage, sewage, a failed shutoff, repeated leaks, or water near electrical equipment. For a suspected gas leak, leave the area and contact the gas utility or emergency services from a safe location.

Further reading: U.S. Environmental Protection Agency. Details can change, so check the official page for anything that matters to you. Spotted a mistake? Tell us. How we write an answer.