What is the lowest flow rate that Flow can detect?

Flow does not measure water flow directly. Instead, it reads the magnetic signal generated by your existing water meter and reports flow with the same sensitivity that your meter provides.

What this means in practice

• If your water meter can detect extremely small flows, Flow will detect them as well.
• If your water meter requires a minimum flow before it registers movement, Flow will follow that same threshold.
• Flow does not impose its own minimum detectable flow — it mirrors the performance of your physical meter.

Typical expectations

Most residential water meters are engineered to detect very low flow rates, such as:

• Dripping faucets
• Slow toilet leaks
• Irrigation seepage
• Micro‑flows from appliances

If your water meter can sense it, Flow will report it.

Why Flow depends on your water meter

Flow is a non-invasive magnetic sensor. It monitors tiny changes in the magnetic field produced by the rotating element inside your water meter.
Therefore:

The accuracy and minimum detectable flow are determined by your meter’s design — not by the Flow device.

Flow simply captures these magnetic changes with high fidelity and high sampling precision, allowing you to see what your meter sees.

Summary