Smart leak detectors warn you that water is escaping. Spot sensors catch water where they sit, flow monitors notice continuous water use, and automatic shutoff valves can stop the water. None of them tell you where a hidden leak is inside a wall, under a slab or in a buried line. That's what professional leak detection does.
Smart leak detectors have become popular, and for good reason: an inexpensive sensor under the sink can prevent costly water damage. But homeowners often expect them to do something they can’t: find a leak that’s hidden. Here’s what each type does, and where professional leak detection fits in.
The three types of smart leak detection
| Type | How it works | Good at | Can’t do |
|---|---|---|---|
| Spot sensors | A small puck or pad sounds an alarm or sends a phone alert when water touches it | Catching drips and floods right where it sits | Detect anything that doesn’t reach the sensor |
| Flow monitors | Read your water meter or measure flow on the main line and learn normal use | Spotting water use that never stops, which is a sign of a hidden leak | Tell you where the leak is |
| Automatic shutoff valves | A motorized valve on the main line closes when a sensor or unusual flow is detected | Stopping a burst pipe or failed hose before major damage | Locate or repair the leak |
What smart detectors catch well
- A leaking water heater tank
- A burst washing machine hose
- A dripping supply line or trap under a sink
- A refrigerator ice-maker line leak
- Toilet overflows
- Basement water from a sump pump failure
These are sudden, visible leaks. Catching them in minutes instead of days is where sensors earn their price.
What they can’t do
- Find a leak under the slab. A flow monitor may flag constant flow, but it can’t point to where under the concrete the pipe is leaking.
- Find a leak inside a wall. Unless water runs down to a sensor, it goes unnoticed.
- Find a buried service line or irrigation leak outside the house.
- Tell a leak from normal use, without a learning period, and slow drips can be too small to trigger an alert.
In short: a smart detector tells you that you have a leak. Professional leak detection tells you where it is.
Where to place spot sensors
- Under the kitchen and bathroom sinks
- Behind each toilet
- Next to the water heater
- Beside or under the washing machine
- Under or behind the refrigerator
- Near the sump pump and in the lowest spot of the basement
- Near the water softener or whole-house filter
Your detector alerted you. Now what?
- Stop the water if you see active leaking. Close the fixture’s shutoff valve or the main shutoff.
- Find the obvious source: sink, toilet, appliance or water heater.
- If nothing is visible, do a meter test to confirm the leak. See how to find a water leak in your house.
- If the meter keeps moving with everything off and you can’t see a leak, it’s hidden: in a wall, under the slab or in the service line.
That’s the point where hidden water leak detection comes in. In Bargersville and the rest of Johnson County, we pinpoint the leak with acoustic, thermal and pressure testing, then mark it so the repair is small.
Are smart leak detectors worth it?
For most homes, yes. Spot sensors near water heaters, washers and sinks are inexpensive protection. A flow monitor adds a useful early warning for hidden leaks. Just don’t mistake an alert for a diagnosis: the sensor starts the search, it doesn’t finish it.
Still can’t find it?
Our hidden water leak detection pinpoints the leak without tearing things up, so the repair starts in the right spot.
Frequently asked questions
Do smart water leak detectors actually work?
Yes, for what they're designed to do. Spot sensors reliably alert you when water reaches them, and flow monitors are good at noticing water use that never stops. They don't locate hidden leaks.
Can a smart leak detector find a slab leak?
A flow monitor or smart shutoff valve may notice the continuous flow from a slab leak and alert you. It can't tell you where under the slab the leak is. That takes acoustic, thermal or tracer gas detection.
Where should I put water leak sensors?
Where leaks start and where water collects: under sinks, behind toilets, next to the water heater, beside the washing machine, under the refrigerator, near a sump pump, and in the lowest point of a basement.
Is an automatic water shutoff valve worth it?
It can limit damage from a burst pipe or failed hose by closing the main water line automatically. It's especially useful for vacation homes or when you travel. It still won't find where a hidden leak is.