Water leaks can be nightmarish- especially if they go undetected. Floods can be deadly- especially if they are unexpected. Luckily, there is technology to detect water well before it harms you or your home. There are many types of water alarms out there, but some models are much more effective than others.

This is where we come in. We’ve researched the best water leak alarms, tested them, and now the results are in: the overall best, a starter option, and an upgrade option. If you need a detector that you can trust to alert you of leaks and floods, one of our suggestions will sound the alarm.

Contents (Jump to a Section)

The Best Water Alarm

Govee Water Detector

Sensitive, Loud, and Versatile

This easy-to-use water detector has the perfect sensitivity for a wide range of applications, at the right price.

$13* at Amazon

*Price at time of publishing; check for price changes or sales.

Govee gives us the most versatile option available, with an inexpensive stand-alone detector that can also be extended into a whole-home WiFi network. The small profile makes them great to nest under water heaters, washers, or in the corner of a basement.

The shrill 100 dB alarm is loud enough to get your attention from anywhere in the house, and it has a silence button on it making it easy to deal with.

Here is everything you get with these detectors:

• 100 dB alarm
• Extendable WiFi capability (sold separately)
• 2x AAA battery-powered

With effective detection and versatile notification all in a small profile, it’s easy to see why the Govee Water Detector Alarm tops the rest.

Budget Leak Alarm

The Basement Watchdog

Loud, Simple, and Effective

This simple and proven alarm can set you up to detect water leaks on a budget.

$12* at Amazon

*Price at time of publishing; check for price changes or sales.

Glentronics hasn’t changed their Watchdog over the years, and they haven’t had to. This thing has been protecting basements for over 30 years, and its simplicity is the key.

With solid-state electronics and a simple wired sensor that can pop off the back and extend 6′, it is the perfect budget solution. It’s also easy to modify- extend the sensor up to 100 feet with standard 24-gauge wire.

Here is how this proven alarm measures up:

• 1/32″ water sensitivity
• 110 dB alarm
• Solid-state reliability, extendable 12 gauge wire
• 9V battery powered

If you are looking for an inexpensive but foolproof alarm for your basement, The Basement Watchdog Leak Alarm is the best option.

Upgrade Water Alarm

D-Link Water Leak Sensor

Versatile, Smart, and Compact

Get notified anywhere if there is water present with the leading IoT water alarm that integrates with a wide range of services.

$79* at Amazon

*Price at time of publishing; check for price changes or sales.

D-Link has developed an intuitive smart sensor that is easy to use while giving great coverage in expandability and notification. Cover essential areas or blanket your whole house with its expandable coverage just by getting more inexpensive remote modules.

The MyDLink smart home app pairs well with other IoT services, including Google Assistant and Alexa, or it does a good job of notifying you or giving automation options on its own. It does rely on WiFi and AC power on the main unit, so you’ll need backups or a failsafe if you want this solution to work during a power outage.

Here are the specs:

• WiFi detector and remote detector (2 locations) included, expandable up to 16 locations.
• 100 dB alarm
• Multi-alert system for notification anywhere (alarm, strobe, and WiFi)
• AC-powered WiFi detector, 2x AA battery-powered remote detector

If want to know when water is present even if you’re on the go, the D-Link Water Leak Sensor and WiFi Alarm is the best choice.

Everything We Recommend

Govee Water Detector

This easy-to-use water detector has the perfect sensitivity for a wide range of applications, at the right price.

Where to Buy

$13* at Amazon

*at time of reviewing

The Basement Watchdog

This simple and proven alarm can set you up to detect water leaks on a budget.

Where to Buy

$12* at Amazon

*at time of reviewing

D-Link Water Leak Sensor

Get notified anywhere if there is water present with the leading IoT water alarm that integrates with a wide range of services.

Where to Buy

$79* at Amazon

*at time of reviewing

The Alarms We Compared

Our research narrowed the field down to a few brands and types of alarms that we compared: Govee, Watchdog, D-Link, Moen, Honeywell, Monnit, Alert Labs, First Alert, Flume, and more.

You can see our full list of review criteria below in the What to Look For section, with an explanation for each.

We considered a wide range of alarms with plenty of different models across many different manufacturers. Battery-powered versus AC-powered alarms caused an interesting discussion, and we almost excluded the latter option. But, many of our readers smartly have backup power sources for their homes. We ended up including them in our comparison just because the convenience of IoT notification couldn’t be overlooked.

We’re always looking for new and better equipment, so if you have a water alarm you trust, let us know in the comments. We review most of our tested equipment annually so we can try to get it in the next roundup round and see if it will beat out our top picks.

What to Look For

The best water alarms have a few features to look for:

1. Value
2. Sensitivity
3. Notification
4. Power & Reach
5. Versatility

When you get the right blend of these, you can find the perfect water detector to find leaks and floods early. Below, we break down what each of these features means for the alarms that truly set themselves apart.

Value: Cost vs. Benefit

The amount of money you spend on something like a water alarm shouldn’t blow out your entire budget. There is a wide range of prices, mostly according to how they are powered and their ability to notify remotely.

You never want to spend too much money on one resource, even when it comes to safety and security equipment. It’s better to diversify your spending to make sure you are covered for a wide range of scenarios.

Sensitivity

Sensitivity goes both ways with water alarms because water vapor is present in the air. Humid summer days, light condensation, and other false positives can drive you crazy if the detection is too sensitive.

On the other hand, if your alarm is not sensitive enough it may not sound before it is submerged in water and possibly useless. Some models allow you to tune sensitivity, but that is often hard to gauge without water to test it with.

Notification

Most alarms make a lot of noise. The more noise the better- as long as there is a shut-off feature. Those that don’t have shut-off features need batteries or sensor wires removed to silence the alarm.

Thanks to technology, Internet of Things (IoT) devices can now notify your smartphone, and send messages and emails to notify when water detection is triggered. With our phones by our sides, this lets you know instantly regardless of whether you are in earshot. It does rely on significantly more infrastructure though, making it less ideal for storms and other disasters where the internet, cell service, and power can be interrupted.

Power & Reach

Speaking of power, many of the simple alarms go for battery power. Common batteries, like 9 volts, AA, and AAA batteries can last a long time in water alarms since the devices do not use much power when they are not sounding the alarm.

You can find hard-wired solutions, but those are less than ideal for storms and emergencies unless you have reliable backup power sources.

Versatility

You can find a lot of uses for devices that make a lot of noise when they get wet. There is a wide range of uses for water alarms. You can make it alarm when it detects a specific amount of accumulating rain, when your rain collection barrels are full, or when a ditch becomes full of water.

Using ice and a little bit of math you can also make a timer. Your alarm will go off after the ice melts and the water touches the alarm.

You can also use one as an impromptu tripwire alarm. With the ability to detect water and get very loud (or even send notifications), you can get creative in your survival solutions.

How to Use a Leak Alarm

There are a few ways to detect water electronically, but most sensors let water complete a circuit to set off the alarm. Depending on the type, it can sound a 100+ dB audible alarm, turn on a strobe light, or even trigger an IoT event to notify you across the world.

To set up an alarm, you’ll need to first identify the area that you would like to monitor. This can be a basement to check for possible flooding, or at the base of a household appliance to check for leaks.

Next, you’ll power the alarm with AC power or the batteries it specifies. Most battery-powered alarms have a massive battery life of up to 5 years because they are simply waiting for water to complete a circuit.

From there, you can further set up IoT automation and add the water sensor to your inspection rotation. I prefer to check mine on the same interval as my smoke alarms and fire extinguishers.

Who Needs Water Leak Alarms?

Many people with basements and older water-related appliances use water alarms for leak detection, but they can also be very useful for flood notifications and emergencies. They can come in handy for any disaster involving water, including:

• Floods (of course)
• Severe Storms
• Hurricanes
• Tsunamis

Other disasters and events that damage your household could cause leaks, although water damage is usually a lesser concern at that point.

If you find yourself with extras, they are useful to stay vigilant with aging appliances; particularly water heaters and washers.

Sources and References

All of our experience and the testing we do to determine the best water leak alarm are useless without listing our research sources and references. We leaned on these for the book knowledge that we paired with our hands-on testing and practical survival experience:

Chan, T., et al. (2018). Review of Current Technologies and Proposed Intelligent Methodologies for Water Distributed Network Leakage Detection. IEEE. Volume 6. Pages 78846 – 78867. (Source)

Convey, H., et al. (2002). Development of a Water Leak Detection System. Computing and Control Engineering Journal. Volume 33. Pages 33 – 38. (Source)

Rabeek, S., et al. (2019). Design of Wireless IoT Sensor Node & Platform for Water Pipeline Leak Detection. IEEE Asia-Pacific Microwave Conference (APMC). (Source)

The Final Word

A water alarm can make a difference if you have one at the right place at the right time. Floods can be devastating and leaks can be a nuisance, so be notified to catch them as early as possible.

Here are a few other gear reviews and guides our subscribers have found helpful:

• Best Flood Barriers for Disasters and Emergencies
• How to Protect Your Property From Flooding
• Home Survival Kit Guide, Gear List, and Checklist

We presented quite a lot of information, but as always: if you have any questions let us know and we would be happy to help. Our testing found the Govee Water Detector to be the best option given its value, sensitivity, notification, power/reach, and versatility.

Keep exploring, stay prepared, and be safe.

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