YoLink Water Leak Sensor 1 is the top pick among smart water leak sensors under $20, rated 4.6 stars across 6,915 customer reviews.
YoLinkWater Leak Sensor 1
4.6(6,915)15% OFF$19.99$16.99
YoLinkWater Leak Sensor 4
4.7(1,715)33% OFF
$23.99$15.99
X-SenseWi-Fi Water Leak Detector
4.5(2,265)29% OFF$15.99$11.39
SwitchBotWater Leak Detector
4.4(1,610)18% OFF$16.99$13.99
TP-LinkTapo T300
4.6(524)25% OFF$19.99$14.99
SwitchBotWater Leak Detector (Sensor Cable Edition)
4.3(1,831)20% OFF$19.99$15.99
AqaraWater Leak Sensor
4.2(3,647)$18.99
GoveeWater Sensor Alarm
4.2(2,803)$15.99- Deals by email
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Third RealityWater Leak Sensor
4.1(351)29% OFF$20.99$14.99
Centralite3-Series Water Sensor
3.8(150)25% OFF$19.95$14.96
SonoffZigbee Water Leak Sensor
4.3(66)$14.99
X-Sense2-in-1 Wi-Fi Water Leak & Freeze Detector
3.0(104)17% OFF$17.99$14.99
HeimanSmart Water Leakage Sensor
4.2(40)24% OFF$19.99$15.19
Third RealitySmart Water Leak Sensor WL2
3.9(41)22% OFF$17.99$13.99
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Frequently asked questions
What are the best smart water leak sensors under $20?
YoLink Water Leak Sensor 1, YoLink Water Leak Sensor 4 and X-Sense Wi-Fi Water Leak Detector lead our ranking of smart water leak sensors under $20, ordered by customer rating weighted by how many reviews back it. The full list compares 14 products in this price range.
How many smart water leak sensors cost less than $20?
This page tracks 14 smart water leak sensors under $20 from 10 brands, with prices starting at $11.39.
Are these prices up to date?
Prices come from each product's Amazon listing and are re-checked continuously, so every card shows the latest price we have. A product whose price rises above $20 drops off this list on the next update.
Looking for more than $20?
See all the water leak sensors in the catalog, compared side by side on specs, price and rating.