A burst pipe gets your attention right away. A slow leak inside a wall, under a floor or behind a fixture can run for months while it rots wood, feeds mold and raises your water bill. Cold winters and older housing make hidden leaks common around here. Here is how to find one before it becomes a serious problem.
Why hidden leaks are common in local homes
Many homes in the area were built in the middle of the last century, and the original plumbing has had decades to corrode and shift. Galvanized pipe and older copper are both prone to pinhole leaks as they age.
Freeze-thaw cycles add to the risk. A pipe that cracks slightly in a cold snap may not show any symptom until weeks later, when temperatures moderate. Other common sources are fittings that have moved with the house, supply lines behind the refrigerator, dishwasher and washing machine, toilet tank parts that fail without overflowing, and water lines running under a slab.
Warning signs of a hidden leak
An unexplained jump in your water bill is one of the most reliable early signs. If your habits haven't changed but the bill has, water is going somewhere it shouldn't.
Other signs: damp or stained patches on walls, ceilings or floors with no obvious cause; peeling paint; a musty smell in a room that should be dry; warped hardwood or swollen baseboards; the sound of running water when everything is off; mold away from the bathroom or kitchen; and water pressure that has dropped slowly over time.
The meter test
Turn off every faucet and water-using appliance in the house, including the ice maker. Find your water meter, usually in the basement where the main line comes in, and watch the dial or the small leak indicator. If it is still moving with everything off, water is flowing somewhere.
To narrow it down, check the toilets first. Put a few drops of food coloring in each tank and wait 15 minutes without flushing. Color in the bowl means the flapper is leaking. Then look under every sink for moisture, soft cabinet floors or corroded supply lines. Pull appliances out a little and check the floor and wall behind them. Look at the water heater and the floor around it for water or rust streaks.
Leaks that need professional detection
Some leaks can't be found without the right equipment. A leak in a water line under a concrete floor can do real damage before anything shows on the surface. Warm spots on the floor, a constant hiss under the floor and new cracks in walls or the floor are clues.
Leaks inside finished walls are just as hard to pin down by eye. Our Leak Detection work uses listening equipment, thermal imaging and cameras to find the source, so we open the wall in the right place instead of guessing.
What a hidden leak really costs
A drip of just one gallon an hour adds up to more than 700 gallons a month. That shows up on every bill, and it says nothing about the damage building behind the wall.
Mold can start growing on wet building materials within a day or two. Homes here stay sealed up through long winters, so a hidden moisture source can spread mold through wall cavities before you ever smell it. Cleaning that up often costs far more than the plumbing repair would have.
What to do if you suspect a leak
If the meter is moving or you are seeing the signs above, act now rather than waiting. Shut off the water to the area if you can find the valve, take photos of any visible damage for your insurance, and call us.
Once the leak is found, we fix it as a flat-rate Plumbing Repair, quoted in writing before we start, with at least a 1-year warranty. If the source is old galvanized pipe, we'll talk about replacing the worst sections. Call (224) 567-2501. We serve Skokie, Des Plaines, the North Shore and the northwest suburbs, and we put tarps down before any work starts.
Frequently Asked Questions
How can I tell if I have a hidden water leak?
Turn off every fixture and watch the water meter. If it keeps moving with everything off, water is leaking somewhere. A higher water bill with no change in habits is another strong sign.
Can a toilet leak without me noticing?
Yes. A worn flapper can leak water from the tank into the bowl silently. Put food coloring in the tank, wait 15 minutes, and check the bowl for color.
How do plumbers find leaks inside walls?
With listening equipment, thermal imaging and cameras. That lets the plumber open the wall in the right spot instead of cutting holes to look.
How fast can mold grow from a hidden leak?
Mold can start on wet building materials within a day or two. That is why a suspected leak should be found and fixed quickly.