The Flume device is very accurate. That is, the water usage that Flume reports will agree very closely with the water usage reported by your water meter.

We had an independent lab test the Flume device on a variety of different water meters (Neptune T-10, Sensus SR2, Hersey 420 and Badger 25). 

Within a controlled environment, the Flume device agreed with the meter within +/-1%. 

Below are the results of a test recently performed by Utah State University:

Please note that Flume’s accuracy can vary due to installation conditions and different meter brands. Outside of this study we have found that on average, the Flume device agreed with the meter within +/- 5% when installed in a residential setting.
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If you would like to check the accuracy of your Flume, you can perform an Accuracy Test. Please reference THIS guide for how to do so. Feel free to contact our support team at support@flumewater.com as well with any questions.