The Best Matter Water Leak Sensors

Leak sensors that work with every major smart home platform.

Matter leak sensors are new, so this list is short. We scored the ones on Amazon on rating, review volume, and features.

Prices, ratings, and review counts captured from Amazon on 2026-10-04.

Our picks

Best Overall

Shelly

Shelly Flood Gen4

4.2 (287)

Wi-Fi, Bluetooth, Zigbee, or Matter, with a sensing cable and a 3-year battery.

4.7 (18)

$27.99 for a slim triple-pad sensor that slides under appliances, rated 4.7 stars.

THIRDREALITY KM1 (Matter over Wi-Fi)

3.2 (34)

Three sensors and a controller with a 100 dB alarm, all over Matter Wi-Fi.

$29.99

View on Amazon →

Side-by-side

Swipe the table sideways to see every column.

#	Sensor	Price	Rating	Reviews	Matter over	Also speaks	Battery	Extras	Score
1	Shelly Flood Gen4	$39.99	4.2	287	Wi-Fi	Bluetooth, Zigbee	Up to 3 years	Leak sensor cable	84
2	Shelly Flood S Gen4	$27.99	4.7	18	Wi-Fi	Bluetooth, Zigbee	Up to 3 years	Slim triple-pad design	65
3	THIRDREALITY KM1 (Matter over Wi-Fi)	$29.99	3.2	34	Wi-Fi	None listed	Sensors up to 3 years; controller on USB-C	Controller with 100 dB alarm, 3 sensors	54

Works with: hover or tap an icon for the system name. A system is shown when it supports the product directly or through the hub the listing requires.

The full ranking

Scored out of 100: 45% customer rating, 30% review volume, 25% features.

Best Overall

Shelly

Shelly Flood Gen4, WiFi, Bluetooth, Zigbee, Matter Smart Flood Sensor with Leak Sensor Cable, Alexa, SmartThings, Google Home, Apple HomeKit Compatible, Flood and Rain Detection, Easy to Use, IP44

4.2 287 reviews

Score 84/100

$39.99

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300+ bought in past month

The most flexible leak sensor here: it speaks Wi-Fi, Bluetooth, Zigbee, and Matter, and comes with a sensing cable.

Matter over: Wi-Fi
Also speaks: Bluetooth, Zigbee
Battery: Up to 3 years
Extras: Leak sensor cable

Pros

Works over Wi-Fi, Bluetooth, Zigbee, or Matter
Sensing cable included
Up to 3-year battery
300+ bought in the past month

Cons

4.2 stars
No built-in siren listed
$39.99

Best Budget

Shelly

Shelly Flood S Gen4, WiFi, Bluetooth, Zigbee, Matter Smart Flood Sensor

4.7 18 reviews

Score 65/100

$27.99

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A slim, cheaper Shelly sensor that slides under washers and dishwashers.

Matter over: Wi-Fi
Also speaks: Bluetooth, Zigbee
Battery: Up to 3 years
Extras: Slim triple-pad design

Pros

Low profile, fits under appliances
Wi-Fi, Bluetooth, Zigbee, or Matter
4.7 stars

Cons

Only 18 reviews
No cable
No built-in siren listed

Best Kit

THIRDREALITY

THIRDREALITY Smart Water Leak Sensor KM1, Matter Over WiFi, 1 KM1-controller with 100dB Alarm & 3 Water Detectors, 3-Year Battery Life, No Batteries, Work with Apple Home, Alexa, Home Assistant, Homey

3.2 34 reviews

Score 54/100

$29.99

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A Matter kit: a powered controller with a 100 dB alarm and three battery sensors.

Matter over: Wi-Fi
Also speaks: None listed
Battery: Sensors up to 3 years; controller on USB-C
Extras: Controller with 100 dB alarm, 3 sensors

Pros

Controller sounds a 100 dB alarm
Three sensors included, up to ten supported
Matter certified, works with Apple Home, Alexa, and Home Assistant

Cons

3.2 stars
The controller needs USB-C power
Only 34 reviews

Buyer's guide

Where should leak sensors go?

Anywhere water can appear without you seeing it: under sinks, behind the toilet, next to the water heater, under the dishwasher and washing machine, and near the sump pump. Put them flat on the floor where water would pool first.

Do I want a built-in alarm?

Yes, if the sensor might be your only warning. A loud local siren works even if your internet or hub is down. App and hub alerts are better when you're away.

How long do the batteries last?

Most battery sensors on these lists are rated for one to three years, depending on how often they report. Low-power radios like Zigbee, Z-Wave, and Thread last much longer than Wi-Fi.

Can a leak sensor shut off the water?

Not on its own. Paired with a smart water shut-off valve through your hub or app, it can close the main valve automatically when it detects a leak.

More Matter reviews

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Leak sensors on other protocols

Z-Wave leak sensors →Zigbee leak sensors →Wi-Fi leak sensors →