Best Water Leak Sensors of 2021

There’s really no good news about discovering a leaky pipe, but water leak sensors catch signs of plumbing problems before the floodgates open. We’ve rounded up five of the best sensors on the market in 2021.
Best Overall
Honeywell lyric water detector
Honeywell Lyric Wi-Fi Leak & Freeze Detector
  • Icon Pros  Light
    Wi-Fi connectivity
  • Icon Pros  Light
    Moisture, humidity, water, and temperature detection
Budget Pick
Best for Emergencies
LeakSMART water detector
LeakSMART Complete Water Leak Detection Kit
  • Icon Pros  Light
    Automatic shut off
  • Icon Pros  Light
    Leak notifications through the app

We chose the Honeywell Lyric Wi-Fi Leak & Freeze Detector as our top pick because it offers easy setup and a smart sensor with Wi-Fi capabilities. It can sense changes in moisture, humidity, and temperature, so it can protect against mold and frozen pipes too.

Our runner-up, the Zircon Leak Alert is a simple detector with a no-fuss setup, loud alarm, and our favorite choice for traditional sensors. The LeakSMART detection kit includes a water shut-off mechanism but requires more money and time to set up.

Each of our picks are effective at guarding your home against water damage with clever alert systems and long battery lives.

Our favorite water leak sensors

Honeywell Lyric Wi-Fi Leak & Freeze Detector Zircon Leak Alert Water Leak Detector LeakSMART Complete Water Leak Detection Kit First Alert Water Alarm
List Price *
Connects to Smart Home
Icon Yes  Light


Icon No  Light


Icon Yes  Light


Icon No  Light



Water, moisture, humidity, temperature

Water and moisture

Water, moisture, temperature

Water and moisture


Phone and Alarm


Phone and Alarm


Learn More

Data effective 2/22/21 11:44 a. m. MST. Offers and availability subject to change. See full disclaimer.

Product reviews: Water leak detectors

Honeywell Lyric Wi-Fi Leak & Freeze Detector: Best overall

The Honeywell Lyric gracefully straddles the line between smart and simple. This is our favorite leak detector of 2021 because it’s clever, but not enough to outsmart you. You can connect it to your Wi-Fi, and it will message you directly if it detects any problems.

If you’re home when the Lyric detects an issue, it’s hard to ignore its alarm. At 100 dB, it isn’t just the loudest alarm on our list, it’s louder than a blender, garbage disposal, or even a diesel truck.

If the Lyric senses significant changes in moisture, humidity, temperature, or water levels, you’ll know as soon as it does. Top it all off with a three-year battery life and a four-foot sensing cable to extend its range, and you have one of the best water detectors on the market.

Pro Heading
Pro Bullet No hub required to connect to Wi-Fi
Pro Bullet Multiple alert options
Pro Bullet Extra sensor cable included
Pro Bullet DIY installation
Pro Bullet Humidity and temperature detection
Con Heading
Con Bullet Mediocre customer service
Con Bullet Tricky setup for multiple units

Some reviewers report having trouble setting up more than one unit. According to the Honeywell user manual, you’ll need to connect each unit to your Wi-Fi individually, so it may take you a little more time.

Zircon Leak Alert Water Leak Detector: Budget pick

For its size and simplicity, the Zircon Leak Alert is a powerful device. App-controlled devices have their place in modern homes, but it’s hard to beat the ease of the Zircon.

Setup is as easy as adding batteries and putting it in place under your sink, washing machine, or toilet. It’s sensitive, too. According to reviews, it’s sensitive enough to be set off by a damp paper towel. The best part is it comes in multipacks for under $50.

Pro Heading
Pro Bullet Ultra-simple setup
Pro Bullet 5 sensors in each package
Pro Bullet Super-sensitive sensors
Pro Bullet Powerful alarm
Con Heading
Con Bullet No smart home compatibility
Con Bullet No humidity or water temperature detection

LeakSMART Complete Water Leak Detection Kit: Best for emergencies

The price tag for the LeakSMART Complete Kit is steep (over $300), but for good reason. You get an advanced sensor and a smart hub to tie the system together. If you own rentals, vacation homes, or just travel often, the LeakSMART’s automatic shutoff feature can stop the problem before it begins, so you won’t come home to puddles on the floor or under the sink.

This is a unique feature we couldn’t find in other sensors. With some plumbing skills, you can connect the LeakSMART water valve to your water main. This smart valve connects to the Wi-Fi enabled smart hub, allowing it to communicate with the sensors placed throughout your house. You can set these sensors to tell the valve to shut off the water main or simply alert you to a problem through text or email.

Pro Heading
Pro Bullet Automatic shutoff
Pro Bullet 5-year warranty
Pro Bullet Smart hub included
Con Heading
Con Bullet Steep price tag
Con Bullet Professional installation recommended

Overall, we’re fans of the connectivity, sensitivity, and long warranty. But you may need some basic plumbing skills to install this valve. If you’re unsure about installing this yourself, we recommend professional installation.

Other water leak detectors to consider

First Alert Water Alarm

Much like the Zircon Leak Alert, the First Alert Water Alarm is a simple unit you can set and forget. This powerful impact-resistant sensor comes with a built-in cable that expands its detecting range by six feet. This cable can sense moisture, so you can feed it through tight spaces other sensors can’t reach. Simply open the bottom of the sensor and extend the sensor wire out of the unit to fit in spaces like under a washing machine.

If you want a no-fuss, classic sensor to keep your home safe for a modest price, First Alert is a great option.

Our Takeaways

  • Batteries included
  • Loud alarm
  • Affordable price
  • No smart home capabilities

Things to consider before you buy a water leak sensor

Chances are your home has multiple spots that are vulnerable to leaks and flooding. No matter what type of sensor you choose, it’s best to get at least two. These devices are small and portable, so you can place them under sinks and behind your washing machine, dishwasher, water heater, or anywhere you have plumbing connections.

The best water leak sensors are discreet until there’s trouble. Basic sensors emit a loud alarm to notify you, while smart sensors can text or send push notifications if there’s a problem. The best sensor for you depends on how you want to learn about a leak.


It varies on the size and age of your home, but it’s best to have one sensor each for your water heater, washing machine, dishwasher, and under sinks. The older and larger your home is, the more sensors you may want.

Water and electricity don’t mix, so these devices are battery-powered. That said, each device requires different types of batteries.

If your device has been triggered, remove it from moisture and take out the batteries. Let the device dry overnight and replace the batteries.

Smart devices generally provide digital alerts, while simpler devices will chirp to signal a low battery, just like a smoke detector would.


How we chose the best water leak sensors

We started our quest for the best water sensors by digging through professional and customer reviews. In our search, we found several stand-out products that caught more attention than others. Products like the Honeywell Lyric and Roost appeared consistently across consumer and professional reviews. Once we assembled our list of star players, the real search began. Resources like owners manuals, product specs, and unboxing videos were all instrumental in the decision of which water leak detector would reign supreme. Learn more about our methodology for this and other guides on our site.

Want to learn more?

We have some more articles that might help. Know what to do before, during, and after a flood with our home flooding resources and find the right sump pump if you’ve got to get water out of your house.

Related articles on SafeWise

Disclaimer list price as of 2/22/21 11:44 a.m. MST. Product prices and availability are accurate as of this date/time indicated and are subject to change. Any prices and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product. utilizes paid Amazon links.

Certain content that appears on this site comes from Amazon. This content is provided “as is” and is subject to change or removal at any time.

Katie McEntire
Written by
Katie McEntire
As a renter, pet-owner, and woman living alone, Katie McEntire takes safety seriously. She’s tested devices like pet cameras, home security systems, and GPS trackers in her own home and devices in the name of safety. In addition to testing, writing, and reviewing for SafeWise, she also makes videos for the site’s YouTube channel. She’s been featured on publications like TechGuySmartBuy, Forbes, Healthy Moms, and Digital Care. Katie has a Bachelor’s degree in Technical Writing from Austin Peay State University in Clarksville, Tennessee. She’s held previous writing positions at and Top Ten Reviews.

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  • surethom

    No Samsung Smartthings water sensor? That’s a great device.