Leak detection since 1986
Water leaks happen.Hear about them before they cost you.
A piercing alarm the moment water touches the sensor. Sits by your water heater, washer, or sump pit. Works for years.
- No WiFi
- No app
- No subscription
Over 1 million units sold
$13,954
the average water-damage insurance claim1
1 in 60
insured homes files a water-damage claim every year1
55%
of washing-machine claims trace to a failed supply hose2
1. Insurance Information Institute, 5-yr avg 2018–2022 · 2. IBHS claim study
The math
A $26 alarmagainst a $14,000 claim
The problem
$13,954
average water-damage insurance claim1
A washer hose lets go at 2 a.m. By morning the floor, the drywall, and everything stored downstairs is gone.
The solution
$25.99
Sonin Water Alarm with Flat Sensor — made for under the washer
Same leak, alarm on the floor: water touches the sensor, a piercing tone wakes the house, you turn one valve, and you're back in bed by 2:15.
1. Insurance Information Institute, 5-yr average 2018–2022
How it works
Three steps.No setup screens.
01
Drop in a 9V battery
Slide-and-snap cover. No wiring, no pairing, no account. Press the test button to hear it work.
02
Place the sensor
Suction cup or adhesive, up to 6–12 feet from the alarm. Put it where water strikes first: the drain pan, the pit, the low corner.
03
Forget it's there
It waits silently for months or years. The moment water bridges the sensor, the alarm sounds — and keeps sounding until you know.
Where water strikes first
Six placesevery home should watch
- 1
Water heater
Tank failures flood fast
- 2
Washing machine
55% of washer claims are a failed hose
- 3
Kitchen sink & dishwasher
Slow drips rot cabinets
- 4
Upstairs bath
Overflows soak the ceiling below
- 5
Sump pit
Pumps fail in the storms you need them
- 6
HVAC drain pan
Condensate lines clog quietly
Most homes have six or more leak zones. One alarm covers one — the Dual Sensor model covers two. Cover the zones that would cost you the most first: the water heater, the washer, and the lowest point in the basement.
Pick your alarm
Three models.One job: catch leaks early.
| Model |  Remote Sensor $23.99 |  Flat Sensor $25.99 |  Dual Sensors $29.99 |
|---|---|---|---|
| Best for | Hard-to-reach spots: sump pits, drain pans, behind appliances | Flat floors and drain pans where water sheets, not pools | Rooms with two leak points — best value per covered zone |
| Sensors | 1 corded, 6 ft reach | 1 weighted flat, corded, 6 ft reach | 2 corded, up to 12 ft apart |
| Power | 9V battery — no wiring, no WiFi, no hub, no subscription | ||
| View model 00800 | View model 00701 | View model 00802 | |
Product video
A closer lookat the alarm
A quick tour of the Sonin water alarm: the unit, the corded sensor, and what comes in the box.
After the leak — or before the job
Moisture meters
Detect the leak, then verify the dry-out. Sonin moisture meters tell you what's happening inside wood, drywall, and concrete — before you paint, stain a deck, buy firewood, or close up a repaired wall.
For buildings, not just homes
Property managers
One prevented claim pays for alarms in every unit. No tenant WiFi, no apps to support, no accounts to manage — just alarms that work in unit 4B the same as unit 12A. Case quantities and white-label programs available.
- ✓ Quantity & case-pack pricing
- ✓ Stocked by HD Supply for MRO buyers
- ✓ Private-label program for your brand
Forty yearsof solving water problems
Sonin pioneered electronic distance measuring in the 1980s, then turned that engineering toward the water problems every building has. Today our alarms and meters are designed and supported from Charlotte, North Carolina — and when you call, a person answers.
704-540-9000