How to Find a Hidden Water Leak in Your Home

Why Hidden Leaks Are So Costly

Most leaks are easy to spot. You see a puddle, a drip or a stain. Hidden leaks are different. They run inside walls, under floors, in the ceiling or beneath a concrete slab. You may not see anything for weeks. Then the water bill jumps, a wall feels damp or a room starts to smell like a wet basement. By then the water may have soaked drywall, rotted wood and fed mold. Finding the leak early keeps the repair small.

A leak does not need to be large to cost you. A pipe that loses just a few drops each second can waste thousands of gallons over a season. Because you pay for water and for sewer service based on use, a leak hits your bill twice. In Waukee and nearby cities, many homes are newer, but fittings, hoses and valves can still fail. Older homes in Des Moines may have aging galvanized or copper lines that wear out from the inside. Iowa also has hard water, which leaves mineral scale that can shorten the life of valves and supply lines.

Ground movement matters too. Iowa clay soil swells when wet and shrinks when dry, and cold winters bring frost heave. That movement can tug on pipes under a slab or in a crawl space. Over time a joint may crack or a pipe may rub through. This is one reason slab leaks happen. Our leak detection and slab leak repair service is built for exactly these cases, where the leak is real but you cannot see it.

Do the Meter Test and Other Simple Checks

The easiest first step is the water meter test. Turn off every faucet and appliance in the house. Stop the ice maker, the dishwasher and the washing machine. Then go to your water meter, which is often in the basement, a utility room or a box near the street. Lift the cover if needed. Look at the small dial or the leak indicator, which is often a tiny triangle or wheel. If it spins or moves while all water is off, water is escaping somewhere. For a stronger test, write down the reading, wait an hour without using water, and read it again. A changed number points to a leak.

Toilets are the most common hidden leak. A worn flapper lets water slip from the tank into the bowl without a sound. To check, put a few drops of food coloring into the tank. Do not flush. Wait 15 minutes. If color shows in the bowl, the flapper leaks. This is often a cheap fix, but if the parts are worn out, our toilet repair and installation team can fix or replace the unit.

Next, check the places where leaks like to hide. Look under every sink for wet cabinet floors or green crust on fittings. Check around the washing machine hoses and the dishwasher. Inspect the base of the water heater for drips or rust. Look at ceilings below bathrooms for stains. Check outside faucets and sprinkler lines, since a broken underground line can look like a soggy spot in the yard. A wet patch in a dry week is a big clue.

Clues That a Leak Is Hiding in Walls or Under the Slab

Your senses can find what your eyes cannot. Listen at night when the house is quiet. A faint hiss or the sound of running water when everything is off can mean a pressurized line is leaking. Smell for a musty or earthy odor in a closet or room, which may mean damp drywall. Look for paint that bubbles or peels, wallpaper that curls and baseboards that swell or stain. Floors may cup, buckle or feel soft. Carpet may stay damp in one spot even after you dry it.

Slab leaks have their own signs. If your home sits on a concrete slab and a hot water line leaks beneath it, parts of the floor may feel warm. Your water heater may run more often because hot water is escaping. You may see cracks in tile or grout lines. Some homeowners hear water rushing under the floor. Low water pressure at several faucets, with no clear reason, is another warning. Do not wait if you notice two or more of these signs.

A leak can also be outside the house. A line from the street or a yard line can break underground, and the water may rise as a wet patch or pool. Homes in rural areas such as Dallas Center, Adel and Van Meter may also have private water systems. If a well home has a pump that runs all the time or pressure that keeps dropping, a leak may be draining the system, and our well pump installation and repair team can check it.

How a Plumber Finds and Fixes the Leak

When you call a plumber, the goal is to find the exact spot with little damage. We start with questions and a pressure test. By isolating parts of the system, we learn which line is losing pressure. Then we use electronic listening gear that picks up the sound of escaping water through floors and walls. Thermal imaging can show cool or warm patterns where water spreads. For drains, a sewer camera can show if a cracked pipe is leaking under the yard. Together, these tools let us mark the leak so we cut only where needed.

Repair choices depend on the leak. Sometimes a spot repair is enough. We open a small section, replace the bad piece and close it up. If the pipe is worn along its whole length, a spot fix may only move the leak down the line. In that case we may talk about rerouting the line through walls or the attic, which avoids breaking the slab. If many leaks keep showing up, repiping may be the better long term step. We give you the options and the price in plain words before we start.

You can lower the risk of leaks. Install a pressure regulator if your pressure is high, since strong pressure wears pipes and fittings. Replace old rubber supply lines with braided ones. Test shutoff valves once a year. Put leak sensors near the water heater, washing machine and sump pit, since they send an alert before damage spreads. In winter, protect pipes from freezing with the steps in our guide on preventing frozen pipes. If a leak turns into a flood, follow the steps for what to do while you wait for an emergency plumber.

Johnston and Granger homeowners often ask about this topic because of finished basements and larger lots. See our Johnston plumbing page and Granger plumbing page for local notes. No matter where you live, the rule is the same. A small clue is cheaper to chase than a big stain.

Questions We Hear Most

Who can help with leak detection & slab leak repair?

Our licensed team can. Call +1 (515) 585-4137 for fast help. We use listening tools and thermal imaging so we can find the leak with as little digging as possible.

Do you offer free estimates?

Yes. We explain the problem and quote the price before we start. You pick the repair option that fits your home and budget.

How do I know if my water bill jump is a leak?

Compare it to the same month last year and check your meter with all water off. If the meter moves, you likely have a leak. A bill that rises with no change in habits is a strong clue too.

Can a leak happen with no wet spots at all?

Yes. Leaks inside walls, under slabs and underground can stay out of sight for a long time. Watch for warm floors, musty smells, low pressure and the sound of running water.