That's a great question. Right now we manually take water samples and get it tested in a lab. Over time, as IoT devices get cheaper, we believe the water quality testing will be done at the source, online, and in real time. This makes it much harder to game the system.
Additionally, we track the GPS location of the truck with the water to make sure clean water is filled up at the source and the same water is delivered to the consumers.
What's to stop another truck with bad and cheaper water from coming and filling up the truck that's being tracked? I imagine if the prices are higher, there's a lot of incentive to commit fraud, especially on something as short-lived as a water supply.
Additionally, we track the GPS location of the truck with the water to make sure clean water is filled up at the source and the same water is delivered to the consumers.