Earlier in the year Clayton discovered that his water bill had suddenly gone up one month. Suspecting a leaky appliance he set out to discover what it was by using an RTL-SDR and the rtlamr decoder. The rtlamr decoder is able to decode water meters that transmit usage data wirelessly via the Itron ERT protocol which is typically found in the unlicensed 900 - 920 MHz band in the USA and Canada.
Clayton wrote a simple Python script to plot the usage data extracted by rtlamr, and after a week determined that water was being consumed at 10 liters an hour even while away from home. Suspecting a leak in the toilets he turned off their valves and the next day saw that the reading remained constant when away, indicating that he'd found the leak.