Licensed, Bonded & Insured AZ ROC #256351
24/7 Emergency Restoration Services

How to Find the Source of a Water Leak

Roof Leak Repair

Water may be life, but it can also damage buildings and homes. A water leak, for example, can lead to the formation of an extensive and potentially deadly mold colony. Water damage can warp floors, discolor otherwise beautiful paint or tile, and even invite pests into the home. Obviously, you want to hire top professionals, but if not then you should carefully inspect the site on your own.

If you notice signs of water infiltration, don’t put off finding and fixing the source of the leak. It can be challenging to figure out where it’s coming from. You have to locate it before it compromises the structural integrity and value of your house. Outlined below are several common sources of water leaks and how to find them yourself.

Water Flows Down

Always trace the flow of water from top to bottom. When detecting a leak, check upwards. Evidence on a window sill might indicate water entering through a roof hole, traveling down walls and floorboards. Head to the attic to identify the leak’s source.

For this task, enlist a partner. One person sprays the roof with a garden hose while the other checks the attic for the entry point. Start spraying at the eaves and work your way up the roofline.

Assess the Plumbing for a water leak

Old, worn pipes and plumbing fixtures commonly cause leaks, often starting in the shower pan or toilet seal. Look for signs like curled or warped flooring, loose tiles, and discoloration, indicating a leak near a bathroom fixture. Delaying bathroom leak repairs allows water to rot the subfloor, necessitating an extensive and costly replacement of all bathroom floorings.

There are a few ways to check if a toilet or shower pan is leaking. You’ll need to fill an eyedropper or syringe with dyed water, and inject it into the toilet bowl. For the shower pan, you can inject dyed water around the junction between the floor and the wall.

Check the Gutters for a water leak

Worn gutters often lead to mold or damp basement walls. If you notice water damage in the basement, examine the gutters on the corresponding side outside. Inspect drains and use the garden hose trick to identify cracks or tears in gutters and downspouts. Persistent basement water damage can result in long-term foundation problems. It might also create a favorable environment for mold growth, cockroaches, and other pests.

Test Windows and Doors

You might have warping or staining beneath a window or around the exterior door thresholds. Stand inside with the windows and doors closed where you suspect the water is coming in. Have your partner turn on the garden hose, and look for leaks. If water is coming in through the windows and doors, you’ll need to re-caulk them. It might be necessary to replace them if the damage is extensive and has caused warping.


HVAC systems can cause a lot of condensation, which drips and pools and can damage your house. Poorly insulated HVAC ductwork may cause rotting jambs around the tops and sides of the windows. Condensation is also a very common cause for mold growth in Phoenix.

Dry Rot

Water leaks and damage often occur on porch roofs that abut the side of the house. The caulking ages, rots, and loses its protective capacity for the roof and porch. If you observe mold and a sagging ceiling, it likely results from worn-out caulking. This will allow water to ingress and cause damage. Promptly re-caulk the roof-house junction to prevent a costly porch roof replacement in the future.

Outdoor Water Leak

Lush, green areas in your lawn signal a sprinkler or irrigation system leak. To check a pool for leaks fill a bucket to match the pool’s water line. Then, mark the levels inside and outside, and wait 24 hours. A mismatch indicates a pool leak.

Detecting an outdoor leak can be challenging, but fixing it typically exceeds the average homeowner’s capabilities. Failure to locate and repair a pool or sprinkler system leak can waste thousands of gallons of water annually.

If your home is already dealing with a flooding scenario, contact our experts at ASAP Restoration today!

Drop a message
  • Drop files here or
    Accepted file types: jpg, gif, png, pdf, heic, jpeg.
      For faster and more accurate quotes please upload any images of the damages, (if available)
    • This field is for validation purposes and should be left unchanged.