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Water Alarm for Leak Detection and Flood Alerts, 3-Pack

Keep your valuable items safe from water damage with First Alert WA100-3 Water Alarms for Leak Detection and Flood Alerts. Each of the water detectors in this pack of three is ideal for placing at the bottom of washing machines, water heaters, and toilets, or in basements where there is a worry of flooding. If a unit senses water, it will emit a loud 85-decibel alarm. Each water sensor is splash- and water-resistant and can be placed up to 6 feet away from the alarm unit.

Early Detection of Unwanted Water

Using a water alarm means you'll know the moment unwanted water has begun accumulating in your home. Place First Alert WA100-3 Water Alarms near sump pumps, at the base of washing machines and water heaters, and near toilets and sinks. Water detectors are also great for use in basements, garages and other areas that are susceptible to flooding.

Loud Alarm Keeps You Alerted

If a water alarm detects unwanted water, a loud 85-decibel alarm will sound. This alarm will continue to sound for up to 72 hours until it is silenced. The water sensor can be placed up to 6 feet away from its alarm unit, which means you can place the alarm somewhere that allows the sound to travel clearly.

Durably Designed for Wet Conditions

First Alert WA100-3 Water Alarms for Leak Detection and Flood Alerts are splash- and water-resistant for reliable detection in wet conditions. Each alarm uses a single 9-volt battery and can operate in temperatures between 32 and 120-degrees Fahrenheit.

First Alert Water Sensor WA100-3

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WA100-3 customer reviews

Overall Rating

20 Reviews
20 customers recommend this product
First Alert WA100-3 Water Alarm (3pk) Reviews
Bettye Kerckhoff
March 9, 2020
Verified Purchase

I recently had a back up in my basement that ended up costing me a lot of money. My plumber recommended that I get these and now I have a sense of calm knowing that I will be alerted if there is water in a basement I rarely go into

Rahat Khan
March 31, 2019
Verified Purchase
Good device

Very easy to install

Richard Harshbarger
December 28, 2018
Verified Purchase
Used alarm for sump pump.

Attached sensor to PVC outlet just above pump. Tested with water in a cup and worked well. Hope I never hear it except for testing, but should give warning if pump fails.

September 16, 2017
Verified Purchase


Linda Hendricks
December 20, 2016
Verified Purchase

The alarms work GREAT! The product is saving our apartment complex money as we have many overflowing toilets and tubs that tenants do not report until it is too late. When it affects a unit underneath them. The alarm lets the occupants know when the water hits the floor. Especially in the case of unattended children in the tub or little ones putting things in the toilet.

Richard Mannix
January 12, 2016
Verified Purchase
Great Deal!

Everything was very smooth. Good price, good service. I will have First Alert Water Alarms under every sink, behind the washing machine, and behind all three of our toilets. If we have a leak, I'll know early enough to prevent major damage.

Rebecca Albert
November 16, 2015
Verified Purchase

Works great and gives me peace of mind after having a flood.

Margaret Velykis
November 9, 2015
Verified Purchase
Very, very good

Nice and loud. Small enough to put anywhere. Thank you,

Paul Pieterse
November 6, 2015
Verified Purchase
Water leak alarm

Excellent product, alarm is loud enough to waken a sleeping elephant! Service is excellent.

Jon Womelsdorf
April 16, 2014
Verified Purchase

Well we have not had a water problems yet, and hopefully not in the future. But we are glad we found your product. Thank you.

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