YoLink Water Leak Sensor 4 is the top pick among smart water leak sensors under $20, rated 4.8 stars across 1,625 customer reviews.
YoLinkWater Leak Sensor 4
4.8(1,625)17% OFF$23.99$19.99
YoLinkWater Leak Sensor 1
4.6(6,854)10% OFF$16.99$15.29
X-SenseWi-Fi Water Leak Detector
4.6(2,196)$15.99
SwitchBotWater Leak Detector
4.5(1,588)$16.99
TP-LinkTapo T300
4.6(511)15% OFF$19.99$16.99
SwitchBotWater Leak Detector (Sensor Cable Edition)
4.3(1,757)10% OFF$19.99$17.99
AqaraWater Leak Sensor
4.2(3,625)$18.99
GoveeWater Sensor Alarm
4.2(2,660)$15.99- Price alerts
Water Leak Sensors under $20, updated as prices fall
We check the price of every Water Leak Sensor in the catalog daily, and email you the ones that drop into this range.
KiddeWiFi Water Leak & Freeze Detector
4.0(733)$18.43
X-Sense2-in-1 Wi-Fi Water Leak & Freeze Detector
3.7(1,003)17% OFF$17.99$14.99
Centralite3-Series Water Sensor
3.8(150)$19.95
SonoffZigbee Water Leak Sensor
4.3(65)$14.99
HeimanSmart Water Leakage Sensor
4.2(40)20% OFF$19.99$15.99
Third RealitySmart Water Leak Sensor WL2
4.0(37)$17.99
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Frequently asked questions
What are the best smart water leak sensors under $20?
YoLink Water Leak Sensor 4, YoLink Water Leak Sensor 1 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 11 brands, with prices starting at $14.99.
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.