Shaped like a drop of water, this versatile device alerts you within seconds of detecting a leak and offers compelling extras like temperature tracking at an affordable price. It was a breeze to set up via the app (Android or iOS) and swift and consistent in my testing, firing off a push notification by phone, email, and text message every time it detected water. (You can configure the alerts.) It also sounds an alarm and flashes a red LED. The device has three metal feet to detect water, but you can mount it and attach the included wired disc sensor instead. Moen also offers a 6-foot leak-sensing cable ($27) that can detect water along its entire length, and you can potentially chain together up to three of these to cover a larger area.

The Moen Smart Water Detector provides temperature and humidity readings in the app and tracks both over the previous 24 hours or seven days. You can set thresholds of temperature or humidity to trigger warnings. You can also reset alarms from the app, which is a nice touch, as it’s not pleasant fumbling to press a button on a detector in a hard-to-reach spot. On the downside, the alarms are relatively quiet compared to other detectors. The device also requires a single CR123A battery, though you get one in the box, and it has no real smart home integration.

★ Upgrade option: The Flo Smart Water Monitor and Shutoff (from $430) can detect leaks in your plumbing and automatically shut off the water supply to prevent serious damage. It also tracks your water usage, flow rate, pressure, and more, giving you stats in the app. We haven’t tested it, but it could provide greater peace of mind. It requires professional installation on top of the high price, making it way too expensive for most folks.

With a set of features very similar to our top pick, the Phyn Smart Water Sensor proved reliable, alerting me to water quickly with piercing beeps, a text message, and a push notification. Unfortunately, the setup was annoying; I had to reload and reenter all my information because the app was flaky. The chunky disc design has three metal feet, and there’s an LED that flashes red when it detects a leak. You can add an Extension Node ($10) (a wired disc that plugs in) or a Water Sensor Cable ($27) (a 4-foot cable that can detect water along its length—you can daisy-chain up to three)—but neither comes in the box.

The Phyn Smart Water Sensor also tracks temperature and humidity, with charts displayed in the app, and you can set alert triggers at certain thresholds. It wasn’t as swift as our top pick, but it was consistent in my testing. It takes two AA batteries (provided). Sadly, you have to press the button on the device to stop the alarm—an in-app option would be better. It’s also relatively large (the size of a hockey puck) compared to other detectors I tested, limiting your placement options. And once again, there’s no real smart home integration.

★ Upgrade option: The Phyn Plus Smart Water Assistant + Shutoff (from $500) tracks water performance in your plumbing system and includes an automatic water shutoff to prevent damage when there’s a leak. It also requires professional installation, so it’s a pricey option. We have not tested this system.

From the simple setup to the swift and reliable alerts, YoLink’s water leak sensors impressed. Simply scan the QR code on each device and press a button to add it to the app. There are three types of sensors: The first detects water dripping onto or rising beneath it, the second comes with a cord that detects water along the length, and the third has water-sensing electrodes on the tip, making it suitable for monitoring the water level in a tank. 

All three came with two AAA batteries installed and detected water swiftly and reliably in my testing while sending notifications to my phone. YoLink’s sensors use the long-range (up to a quarter of a mile) and low-power LoRa standard, and they don’t need a Wi-Fi signal, as they link directly to a hub. The hub connects to your router, ideally via the Ethernet cable provided, and must be plugged in to an outlet. The starter kit we are linking here includes the hub and four Water Leak Sensor 1 units. 

The sensors detect any water immediately, alerts come through as a notification on your phone, and the sensor flashes red. But there’s no sound from the Water Leak Sensor 1 or the standard hub. The Water Leak Sensor 2 and 3 ($23 each) have an inbuilt sounder, and you can buy a SpeakerHub ($30) or a wireless Smart Siren ($26) that goes up to 110 decibels. The straightforward app also allows you to set up customized alarm strategies and automation (YoLink offers a wide range of sensor types beyond water detection, and the ecosystem works with IFTTT and Alexa). While it may take a few devices and some tinkering to get things the way you want, YoLink’s system is affordable, versatile, and reliable, and LoRa is ideal for larger properties with Wi-Fi issues.

★ Upgrade option: The YoLink Smart Valve Controller ($120) is a relatively affordable automatic shutoff, and you can link the sensor directly so an alert triggers it without needing Wi-Fi. YoLink also offers other shutoff systems, but I haven’t been able to test any of them.

If you want to stretch your money, you can get a three-pack of Govee Wi-Fi Water Sensors for the same price as a single one of our two top picks. These are quick and easy to install, and they send alerts as push notifications and emails. They also boast one of the loudest sirens I tested (100 decibels). Mercifully, you can shut off the ear-splitting sound from the app. The sensors are quite small, and they offer drip detection on top and metal feet for leak detection underneath, but there’s no option to add a disc or cable.

The Govee Wi-Fi Water Sensors only detect water, but they are effective. I found alerts triggered within a few seconds, and there’s no way you won’t hear the siren. The app is basic but works well and displays alert history. Unfortunately, these sensors require a Govee Wi-Fi hub (included in the box), which takes up a power outlet, and each sensor takes two AA batteries (also provided). One concern with these sensors is that I failed to receive alerts when my phone was connected to mobile data rather than Wi-Fi, though the email did come through. There’s also no smart home integration. You can add additional individual sensors at $13 each or buy five for $50.

With HomeKit support, this is a good choice for iPhone owners with a home hub (an Apple TV, HomePod, or iPad). HomeKit is also ideal if you have privacy concerns because you can be certain no data will be shared with third parties. There is an Eve app, but you can also view the Water Guard and set notifications directly through the Apple Home app. It plugs directly into an outlet and has a 6.5-foot cable that senses any water and immediately alerts you on your iPhone, iPad, and Apple Watch, wherever you are, provided you have a working home hub. It also flashes red and has a 100-decibel siren. You can review alarm history, test or mute alarms, and update device firmware in the Eve app.

The Eve Water Guard only detects water, but the sensing cable worked well in my testing, triggering quick alerts and covering a large area. It needs a power outlet, which also limits your placement options, but you never need to worry about battery life. The obvious drawbacks are the complete lack of support for Android, the fact that you need a home hub for remote alerts and management, and the relatively high price. But if you already have a HomeKit setup, this is a solid pick. You can also add 6.5-foot sensing cable extensions ($20 each) up to a total length of 500 feet.

Stitch by Monoprice Water Leak Sensor for $25: This affordable water leak detector has a design that’s similar to our top pick. The main body is round, with metal feet to detect water pooling, and it slots into a bracket for wall-mounting. It comes with a coin-sized plug-in extension that stretches up to 3.8 feet. Both the main detector and extension were quick to sound the alarm and send notifications to my phone when wet (though the on-device alarm is not very loud). It takes a single CR2 battery, displays remaining power in the app, and alerts you when it’s time to change batteries. Unfortunately, the app is basic and poorly translated, you have to dry the detector to stop the alarm, and it took too long to warn me when it went offline (weirdly, the offline detector is toggled off by default in the app settings, so I had to switch it on). You can get this a bit cheaper by buying direct from Monoprice (though it’s out of stock at the time of writing).

D-Link DCH-S161 Wi-Fi Water Leak Sensor for $50: This wall-mounted sensor takes two AA batteries and features a sensor with a 5.9-foot cable. Alerts were reliable during my testing, with push notifications coming through to my phone swiftly. The on-device siren is around 90 decibels. Mercifully, you can switch it off via the button on top. It will also warn you when the battery needs to be changed or if there’s a problem with your Wi-Fi connection. There’s support for Google Assistant and IFTTT. This sensor may be tough to find (discontinued). We plan to test its successor, the D-Link DCH-S1621KT ($80), very soon.

We did not have a great experience with every water leak detector we tested.

Wasserstein Smart Temperature, Humidity and Water Sensor for $20: This is great value, but I only got it working by switching to the iPhone app after multiple failed attempts to connect with the Android app. Once added via iPhone, the sensor appeared in the Android app too. But the device made a barely perceptible continuous scratching sound and seemed to disconnect from Wi-Fi quite frequently. Some users have reported similar Wi-Fi issues in online reviews. It’s a shame because this affordable sensor, which takes two AA batteries, was one of the fastest to alert when wet, with a loud siren sound and instant notifications to both apps. It can also track temperature and humidity.

Swann Leak Alert Sensor for $25: While this battery-powered water detector (two AAAs) is affordable, I had a terrible time setting it up. Your phone must be on 2.4-GHz Wi-Fi, but even then it took me multiple attempts to connect. Frustratingly, you must remove the screw panel to reset it because there’s no option in the app. Alerts came through to my phone around a minute after I soaked the sensor, but the Swann app is slow and clunky.

Here's what you need to think about when you shop for smart leak detectors and install them in your home.

Placement and Sensors: Unless you have a single problem spot or appliance you want to monitor, you will likely need multiple leak detectors. Most have cables with sensors on the end, some have water-sensing cords, and others are self-contained. You also have the option of extension nodes with some detectors. Think about the areas you want to cover when considering what kind of detector would work best for you and how many of them you need.

Alerts: All the smart water leak detectors we tested send push notifications when there’s a leak, but some also send emails and texts. Most have some kind of built-in alarm sound, but some offer separate sirens or can be configured to send alerts through smart speakers or other devices. It’s worth checking whether your pick supports disconnection alerts to warn you when the connection is lost, which may happen if power or Wi-Fi goes out.

Power: Most detectors are battery-powered, but you can get some that plug directly into outlets. You can set and forget plug-in detectors, but batteries give you more flexibility with placement, and the companion app will typically warn you when the batteries need to be changed.

Wi-Fi Access: Most smart water leak detectors connect directly to your Wi-Fi router or a hub, so make sure that you have a decent signal wherever you are installing them. Most of the devices we tested only connect to Wi-Fi on the 2.4-GHz band. Remember that they need internet access to alert you to any leaks or problems when you are away from home. If your internet goes down, they will simply act as local alarms.

Smart Home Integration: While companion apps and mobile notifications are typical, some detectors support smart home standards, which allows you to access detectors in your chosen smart home app and set up triggers or automation. For example, you could set a water alert to flash your smart lights or select a temperature that triggers heating or air conditioning to turn on.

Automatic Water Shut-Off: With some high-end systems, you can install a water-monitoring device with an automatic shutoff function, enabling any leak detection to shut off your water supply. But these systems are usually expensive and may require professional installation.

Temperature and Humidity Monitoring: Some smart water-leak detectors can also monitor the temperature and humidity, potentially alerting you to the danger of frozen pipes or damp environments that could indicate a leak nearby. You can generally review the temperature and humidity over time so you can immediately spot any notable changes that need investigation. With smart home automation, you can also trigger heating or fans at certain levels to reduce the risk of damage.