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Model # BWD-HWA

Internet # 100038838

Store SKU # 854911

Battery-Operated Water Alarm

This item has been discontinued.
The Home Depot no longer carries this specific product.

$9.97 /each
  • Use to detect leaks before costly water damage is caused
  • Loud 110 dB alarm can be heard throughout the house
  • Requires a 9-volt alkaline battery (not included)




Model # BWD-HWA

Internet # 100038838

Store SKU # 854911

Store SO SKU # 1000895681

Use the Basement Watchdog Battery-Operated Water Alarm to detect leaks before costly water damage occurs. This alarm can detect as little as 1/32 in. of water and produces a loud 110 dB alarm that can be heard throughout the house to provide an effective early warning system. The water alarm can be placed directly on floors or mounted for installation in a variety of locations: in a sump pit, near water heaters, refrigerators or dishwashers, next to washing machines, under sinks, close to air conditioner drain tubes or wherever there is a risk of water damage. The sensor with 6 ft. of wire offers installation versatility and can accommodate the addition of more than 100 ft. of wire. The water alarm operates using a single 9V alkaline battery and has a battery-saver feature that only uses energy when the alarm is sounding.

  • Detects as little as 1/32 in. of water to offer an effective early warning system
  • Solid-state circuitry is extremely sensitive and reliable
  • Loud 110 dB alarm can be heard throughout the house
  • Sensor has a 6 ft. wire so it can be extended into a sump pit, or mounted on a wall
  • Accommodates the addition of more than 100 ft. of wire (additional 24 gauge wire not included)
  • Battery will last approximately 2-4 years or as long as stated on the battery packaging

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Brand compatibility 
Product Weight (lb.) 
0.29 lb 
Warranty / Certifications
Manufacturer Warranty 
5 Years 


Rated 4.6 out of 5 by 143 reviewers.
Rated 5.0 out of 5.0 by Cheap Insurance for Basement and Garage Flooding After having the horror of a floor drain backing up in the basement, I wasn't about to take another chance in not knowing when water was coming up onto the floor. I bought this water alarm after seeing that I could install the sensor wherever I wanted and have the alarm itself high and dry, closer to where we'd hear it easily. It can detect water as shallow as 1/32nd of an inch deep. Giving you plenty of time to take action before it's a full on flood. It requires a 9V battery (not included) to operate. The manual says it can last up to five years on one battery, since it only turns on when the sensor gets wet. You can place the alarm right on the floor, or you can detach the sensor and place the alarm up to six feet away with the included wire. You may extend the wire up to 100 feet if you need to. This alarm would also work great to detect leaks from things like spring thaw through the foundation, sump pump failure, hot tub leaks or even an aquarium leak. Given that it has a five year warranty and it's so inexpensive, there is no reason not to have at least one of these in your home. It's far less expensive than an insurance claim or paying to repair and clean up water damage. March 9, 2014
Rated 5.0 out of 5.0 by Every home should have at least one of these! I wish I knew about this product earlier. The drain on our air conditioner clogged and flooded our hallway and dining room ruining the wood floors. I thought then that I wished there was some type of device that would warn of a water leak. Then one day I happened across this product while looking for something else in the plumbing isle at Home Depot. I bought it and tested it out at home and it works great. It has a loud, high pitched alarm that sounds when water comes into contact with the two metal spots on the bottom. I set it on the floor behind the A/C filter (CLICK ON PHOTO BELOW). I plan on getting another to put near the water heater. It was only $10 and could potentially save me thousands of dollars in water damage. Highly recommended!! December 10, 2014
Rated 5.0 out of 5.0 by Easy to use for piece of mind Put battery in, place it on the floor and don't have to worry about my sump flooding without the warning alarm. April 29, 2014
Rated 5.0 out of 5.0 by Excellent sensitivity, easy to install, great features, highly recommend it. We've had a couple minor water related problems over the years, mainly caused by poor reliability of available sump pumps and their switches. So after the most recent episode, I replaced the sump pump with most durable I could find and built my own switch to control it. For extra piece of mind, I purchased 2 Basement Watchdog Battery Operated Water Alarms. I like the removable sensor feature that allows the homeowner to mount the alarm on the wall and put the sensor 6 feet away on the floor. You can also splice in extra wire if needed. I spliced in a second sensor, made from 2 stainless steel screws and nuts, that hangs down into the sump on a couple small pieces of PVC pipe about an inch above the waterline where the switch turns the pump on. If the pump fails for any reason and the water ever reaches the screws, the alarm will sound. The actual splice is 2 more stainless screws and nuts, mounted on a piece of plastic that I set on the floor beside the sump. That forms a 3rd sensor for “free”. The second Watchdog Alarm unit that I bought I just put a battery in, wrote the date on the side, and set it on the floor near the water heater, just in case. While I was home last weekend, our electricity went off. I knew it was just a matter of time before the sump would fill without the pump running. Sure enough, within 5 minutes the alarm sounded just as advertised. These units are extremely easy to set up, just put a battery in, and put it sensor side down on the floor. I recommend writing the date on the side to remind you to change the battery after a year or two. Or you can extend the sensor with or without DIY modifications to fit your application. They are very sensitive, just touch the sensors to give yourself piece of mind that they are working. For the price, anyone with indoor plumbing should have a couple to alert you to water where it's not supposed to be. May 21, 2013
Rated 5.0 out of 5.0 by Works, but hope it never goes off I've tested it by putting my finger across the sensors. It's loud enough... Sitting in a hot water heater pan because the heater is from the 90s September 1, 2015
Rated 5.0 out of 5.0 by A great product The Water Alarm was easy to set up using a 9 volt battery. I have peace of mind knowing if my hot water heater leaks, the alarm will sound and I can shut off the water, then call the plumber. November 11, 2015
Rated 3.0 out of 5.0 by Mixed feelings Had a washer that overflowed due to a faulty part. The product did work but I felt that it should have gone off sooner than it did because I saw & heard the water overflowing before the alarm went off. November 11, 2015
Rated 5.0 out of 5.0 by Expandable Too Works well and easy to test with a little water or your hand. Since I was going to splice in some wire into the existing wire for a long run anyway, I wondered if I could add a "sensor". So I spliced in two more wires - 3 and 12 foot bell wire, wired in parallel - and then took two small pieces of wood and put screws in the blocks (spaced like the two contacts on the original sensor) and used them to secure the other ends of the wires. And it works ... if water hits either the original sensor or my two make shift ones the single base unit alarms. And now I've got coverage for an odd shaped space that includes a lift station and water heater for the cost of my time and the parts and pieces I keep in the shop. December 31, 2011
  • 2015-11-29 T10:36:22.292-06:00
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