Third Reality's Zigbee Water Leak Sensor fires the instant water bridges its contacts, sounding a local buzzer and reporting the leak to Home Assistant over Zigbee.
Works on integrations
Protocols
Setup guides
Roles it can fill
Detects water at the probe contacts and reports a leak state to Home Assistant, with an on-device buzzer that can be toggled and set to different alarm modes. Local Zigbee alerts keep firing when the internet is down, which is what matters for an emergency sensor. Battery powered for placement under sinks, water heaters, and washing machines, with a low-battery report. Pairs directly with ZHA or zigbee2mqtt, fully local.