The Sensor You Hope Never Fires — Water Leak Detection Done Right (Beginner Tip)

Automation Inspirations
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My beginner tip: some sensors are for comfort, one is for disaster. The Aqara Water Leak Sensor T1 in our laundry room cost about 15€ and might one day save us a four-digit repair bill. But here is the thing most beginners get wrong: the sensor is the easy part — the alert is what matters.

A water leak is not a “check your phone when you get around to it” event. If the washing machine hose lets go, every minute counts. So our alert does two things at once:

  1. Alexa announces it on every Echo in the house — you hear it no matter which room you are in, phone in your pocket or not.
  2. A critical push notification on the phone — critical: 1 means it breaks through silent mode and Do Not Disturb at full volume. A leak does not care that your phone is on mute.
alias: Water leak alarm
description: Critical notification on water leak (push + Alexa announcement)
triggers:
  - trigger: state
    entity_id: binary_sensor.water_leak_sensor_t1_laundry
    to: "on"
conditions: []
actions:
  - action: notify.alexa_media_everywhere
    data:
      message: >-
        Attention! Water leak detected in the laundry room! Please check
        immediately!
      data:
        type: announce
  - action: notify.mobile_app_my_iphone
    data:
      title: 💧 WATER LEAK!
      message: Water leak detected! Check immediately!
      data:
        push:
          sound: critical
          critical: 1
          volume: 1
mode: single

Three placement/setup tips:

  • Put the sensor where water actually collects, not where it sprays — for a washing machine that’s the lowest point of the floor nearby.
  • Test it once with a wet cloth on the contacts. You want to hear what the alarm sounds like before the real thing.
  • The critical push needs the Home Assistant Companion App on iOS — regular notifications won’t break through silent mode.

The best automation is one that never runs. But if it does, it should be impossible to miss.

Where did you place your leak sensors — and has one ever actually saved you? StarterTips

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@frankdreyer73 Love this “alert > sensor” framing — that’s exactly how leak detection should be approached. The Water Leak Sensor T1 is basically a simple conductivity trigger (when the probes contact water, it reports a leak to the hub), so making the notification impossible to miss is where the real value is.

On placement: your “lowest point where water collects” tip is spot on. For anyone new to these, Aqara’s intended setup is also straightforward: you can just place it on the surface you want to monitor, or use the probe screws to connect cables if you want to extend detection to a tighter/hidden spot (like under a dishwasher lip or inside a drip tray).

Two small practical adds people often overlook:

  • It needs a hub (so plan placement with Zigbee range in mind, especially for laundry/utility rooms).
  • The sensor itself is IP67 rated, so it can survive short-term flooding (still, the goal is to catch leaks early like you’re doing).

Curious what others do here too: do you all cover just “appliances” (washer/dishwasher/water heater), or also the sneaky spots like under sinks and by radiators?

This information comes from community discussions and user experience summaries and may vary by environment. Please verify carefully. Original post link: Aqara Wasserlecksensor – Hilfecenter – Help Center

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