How to Find a Water Leak in Your Home

How do I use my water meter to confirm a leak?

The meter test is the most reliable home check, and it costs nothing. It tells you for sure whether water is escaping somewhere.

Here is how to run it:

• Turn off every water fixture and appliance in the house. No faucets, no ice maker, no irrigation, no washer.
• Find your water meter, usually in a box near the curb or sidewalk.
• Note the reading or watch the small leak-indicator dial (often a little triangle or wheel).
• Wait one to two hours without using any water, then check again.

If the meter moved or the indicator spun while everything was off, water is leaking somewhere on your side of the meter. For a faster version, write down the reading, do not use water for 30 minutes, and look for any change.

A confirmed meter movement means it is time to narrow down where. If you cannot find it, our leak detection tools locate it precisely.

Check your toilets first

Before tearing into walls, check the most common culprit: a toilet. A leaking toilet is silent, sneaky, and can waste an astonishing amount of water around the clock.

The usual cause is a worn flapper — the rubber seal at the bottom of the tank — that no longer seats properly, letting water trickle from the tank into the bowl.

The dye test finds it in minutes:

• Drop a few drops of food coloring into the tank (not the bowl).
• Do not flush. Wait 15 to 20 minutes.
• If color shows up in the bowl, the flapper is leaking.

Check every toilet in the house this way. A flapper is an inexpensive part and an easy swap. If the leak persists after a new flapper, the fill valve or flush valve may be worn, which is a quick fix for a plumber. Toilets are a frequent reason a meter keeps creeping even when you swear nothing is on.

Signs of a slab leak under your foundation

Some of the worst hidden leaks are under the concrete slab your house sits on. The water lines beneath the foundation can corrode or wear through, and the leak hides below your feet.

Watch for these signs:

• A warm spot on the floor, which usually means a hot-water line is leaking under the slab.
• The sound of running water when everything is off.
• Unexplained low water pressure throughout the house.
• Cracks appearing in flooring or walls, or a section of floor that feels damp.
• A spike in the bill with no visible leak indoors.

Slab leaks are common in slab-on-grade homes, and the clay and adobe soils around Bloomington can shift and stress buried lines over time. This is not a DIY find. Pinpointing it without jackhammering the whole floor takes specialized equipment. If you suspect one, slab leak detection and repair locates and fixes it with minimal disruption.

Tracking down leaks inside walls and indoors

Indoor leaks behind walls and under sinks leave traces if you know where to look. Walk the house slowly and use your senses.

• Look for discoloration, bubbling paint, or soft, swollen drywall and baseboards.
• Feel walls for damp or unusually cool patches.
• Smell for that musty, mildew odor that hidden moisture creates.
• Check under every sink and around the water heater, dishwasher, and washing machine for drips, corrosion, or water stains.
• Watch for warped flooring or peeling vinyl near plumbing walls.

In older Bloomington homes with galvanized steel supply pipe, pinhole leaks inside walls are common as the metal corrodes from the inside. They start small and stain slowly.

If you find clear evidence but cannot reach the source, do not start cutting drywall blindly. Locating it precisely first saves you patching a half-dozen unnecessary holes, and lingering moisture is what leads to water damage repairs and mold.

Finding leaks outside and in the main line

If the meter shows a leak but the house seems dry, the problem may be outside between the meter and the home, or in the irrigation system.

Look for these outdoor clues:

• A patch of grass that is greener, lusher, or soggier than the rest of the yard.
• Pooling or persistent mud where there should not be any.
• A drop in pressure at outdoor spigots.
• Sunken or sinking spots in the lawn or near the driveway.

The buried main line that carries water from the meter to your house can crack or corrode, especially older lines in shifting soil. A leak there runs continuously and often shows above ground as a wet trail.

This kind of leak is below grade and needs the right equipment to trace. If your soggy spot lines up with the path from the meter to the house, it points to the main, and water line repair is the fix. When in doubt, contact us and we will run the detection for you.