Taken from satellite mounted sensors, the raw imagery is overlaid on geographic information systems and processed by a unique algorithm that detects treated water, which in most cases indicates the presence of a leak. Each image covers a 3500km² area of land, typically big enough to cover most UK cities, and thousands of kilometres of pipework.
At the beginning of each period, SUEZ provides a graphic or tabular Leakage Report containing the location of suspected leaks. The satellite locates leaks within a 100m buffer, though this can vary. A leakage inspector is then sent to confirm and mark the final location of the leak.
The service provided by SUEZ can be carried out periodically, on a monthly, quarterly or half-year basis.