Hi,
Droplet (Droplet the Smart Home Water Sensor - Hydrific, part of LIXIL) just added local MQTT support for HA which is fantastic. I had been asking them about it when I first heard about it last year.
Once I saw that was added, I ordered it right away. It comes this week. I will update this thread with my thoughts after setting it up.
Matt
Received the unit. It seems to work very well actually! Working through a unit-of-measurement issue here:
Will report back more later but to be honest, it seems well-made, reports changes quickly (2-3 seconds or so after) and was extremely easy to install.
Edit: measurement issue fixed. (see thread above).
Matt
Thanks for the update! I’ve got one on order as well as I was lacking the data since our water utility switched meters and took my flume out of service as it’s not compatible with the new meter.
I think you’ll like it! It seems to be pretty accurate from my early tests. I’ll do more tests over the weekend.
One thing I am curious about is if I hook it up to a Local only WiFi network (no internet access) if everything will still work properly w/ the local MQTT stuff. For the initial setup I gave it my regular (internet-enabled) SSID.
I will try that also over the weekend since long term, I don’t want it talking outside the LAN.
Matt
Odd that it only exposes the flow rate and not the. Total daily usage - Seems that would be useful to include?
@peterd2 in case it helps, this is what I “wrap” the raw output in to get daily total for today as well as the past week or so:
sensor:
- platform: integration
source: sensor.droplet_flow_rate
name: "Total Water Usage"
round: 2
unit_time: min
method: left
utility_meter:
daily_water_usage:
source: sensor.total_water_usage
cycle: daily
Has anyone tried this with only WiFi network (no internet access)?
This seems to be a good alternative to outfitting a conventional water meter with a magnetic sensor via esp home, to turn off a water valve in the event of a high flow scenario. Any reason that would not work with this integration?
Depends how they wrote the firmware. I will try it this weekend and let you know.
What kind of flow rates can it detect? What’s the minimum you’ve observed?
Just dumping the last days data and sorting, mine says 0.026417205 gal/min is the lowest value above 0. That’s about 7 tablespoons/min. Not sure if that’s the lowest resolution, however.
Ended up here after reading it can learn and classify what is using water with its AI. That sounds just awesome for automations!
But I quite don’t like to rely on an external server. So if anyone got it working offline + local I’d be thankful for feedback! And whether it can learn things when offline too!
It supports local MQTT publishing of water usage data. That’s pretty clear in this thread. With 2025.10 it has a new local integration that makes it easier to add.
It learns how much water you use and when in local mode. Anything beyond that would require you to code it.
The mobile app relies on an external server. The local device does not. With the advantage of multiple subscribers data and Machine Learning, it’s pretty obvious the cloud based app has the advantage in the learning department. You’ll have to decide if that additional metadata is useful to you. AFAIK, it’s not shared with the Home Assistant integration.
Thank you for this, that’s 1 of the things I wanted to know. 2nd being the reliability.
gosh the tone. No, It’s not pretty clear, the last message in the thread is basically “Not sure it works well while totally offline, will test and report back”.
Yeah, tone is hard in the written form, no? 
Does this help?
The Droplet integration was introduced in Home Assistant 2025.10, and it’s used by 0 active installations.
Its IoT class is Local Push.
Only if you’ve enabled analytics!
Yes I do have them enabled! I like to help out the HA community as much as I can!
Matt
Does anyone know if something like Droplet is available in Europe? Currently it seems to be US only …
From their FAQ:
Currently, Droplet is operational exclusively within the United States. However, we are actively exploring opportunities for international expansion. Stay tuned for updates! You can contact us at [email protected] with any questions.
Maybe shoot them an email?
Ive got a response:
Hi,
Unfortunately, Droplet is currently only available for purchase, shipping, and use within the United States.[1] Our mobile app is only available in the U.S. App Store and Google Play Store, which means you cannot download or use the app outside the United States - and without the app, Droplet cannot be set up.
However, we’re actively exploring international shipping and compatibility, and will update our website and newsletter as new regions become available.[2]
Regarding Home Assistant integration - great news! Droplet does support excellent Home Assistant compatibility through both local API access via MQTT and core Home Assistant integration.[3] We offer real-time water usage data, custom integrations, and smart home ecosystem connectivity.[4]
This answer was composed by Droplet, Hydrific’s AI Agent.
AND MORE DETAILS:
Unfortunately, Droplet cannot work in Europe even if you only plan to use it with Home Assistant.[1]
The device requires our mobile app for initial setup, and without this setup, Droplet cannot operate at all. The app is only available in the U.S. App Store and Google Play Store, making it impossible to configure the device outside the United States.
While Droplet does offer excellent Home Assistant integration through both MQTT and core integration once set up,[2] the initial configuration through our mobile app is mandatory for the device to function.
Bronze quality