The short answer
Check Visible Pipes First
Begin with the pipes you can see. Look under sinks, in basements, and along exposed runs in garages or crawl spaces. Check for cracks, bulges, or any spots where the pipe looks swollen or discolored. Frost can split a pipe without a visible break until the ice thaws, so feel along the length for dampness or moisture.
Also check joints and fittings. These are common failure points after a freeze because the metal or plastic expands and contracts. Use a flashlight to inspect hard-to-see areas. If you find any suspicious spot, mark it with tape so you can watch it when you restore water pressure.
- Look for cracks or splits in the pipe surface
- Feel for dampness or wet spots along the pipe
- Check joints and fittings for gaps or drips
- Inspect areas near exterior walls and unheated spaces
- Use a flashlight to see dark corners clearly
- Mark any suspect area with tape for later checking
Turn off the Main Shutoff Valve
Before you test for leaks, shut off the main water valve to your home. This stops the flow so you can inspect without a sudden burst flooding the area. The valve is often near the water meter, in a basement, or on an exterior wall. If you live in a cold climate, keep the location written down for future freezes.
After you close the valve, open a few faucets to drain the remaining water from the pipes. This relieves pressure and makes it easier to spot leaks when you turn the water back on. Leave the faucets open until you are ready to test.
Turn Water Back on Slowly
Once the pipes are drained, close the faucets and turn the main valve back on slowly. Go to the lowest faucet in the house, like a basement sink, and open it. Let water run for a minute to push out air. Then close it and walk through the house, listening for hissing or dripping sounds.
Watch the pressure gauge on your water system if you have one. A drop in pressure after the valve is open can signal a leak somewhere. Also check the water meter if it has a leak indicator. Many meters have a small dial that spins when water flows, even a tiny amount.
Inspect Floors, Walls, and Ceilings
Water from a pipe leak often travels along joists or inside wall cavities before it becomes visible. Look for water stains, bubbling paint, or peeling wallpaper on ceilings and walls. Feel the base of walls and floors for dampness, especially near bathrooms, kitchens, and laundry areas. Pay attention to any musty smell, which can indicate hidden moisture.
Check under sinks, around toilets, and near the water heater. Also inspect the subfloor in crawl spaces or basements if you can access them. Use a flashlight to look for dark spots or warped wood. If you find damp material, dry it quickly to prevent mold growth.
- Look for water stains on ceilings and walls
- Feel walls and floors for dampness near fixtures
- Check under sinks and around toilets
- Inspect the water heater area for pooling water
- Smell for musty odors that suggest hidden moisture
- Examine crawl spaces and basements for wet wood
If You Find a Leak, Act Fast
If you discover a leak, shut off the main valve again immediately to stop the water flow. Then open faucets to drain the system and reduce pressure. This limits the water damage while you decide on next steps. You can also place a bucket under a small drip to catch water until help is available.
For a significant leak or if water has soaked into walls or floors, local water damage pros can help with extraction and drying. They have equipment to find hidden leaks and dry out structures. The cost depends on the extent of the damage and the materials affected. Policies vary, and your insurer decides what is covered.
Water damage does not wait
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (425) 407-5186Frequently asked questions
How long after a freeze should I check for leaks?
Check as soon as the ice thaws and temperatures rise. Some leaks appear immediately, while others take hours or days to show. Look for damp spots, listen for hissing, and watch your water meter. If you suspect a leak, act quickly to minimize damage.
Can a small leak fix itself?
No, a leak will not fix itself. Even a tiny drip can worsen over time and cause water damage or mold. Turn off the water and dry the area. For a temporary fix, you can use pipe repair tape or a clamp, but a permanent repair needs a plumber or water damage pro.
What should I do if I can't find the leak?
If you suspect a leak but cannot see it, turn off the main valve and call a plumber or a water damage pro. They have tools like moisture meters and acoustic devices to locate hidden leaks behind walls or under floors. Do not ignore the signs, as water can cause serious damage over time.