As well as collecting water in the Island’s main reservoirs, the Company also collects water from many of the Island’s streams which are remote from the reservoir catchment areas. These streams are fed by rain water running off the land and by underground springs.

The water in the streams is caught in a collecting pond or small reservoir. Each of these sources or small reservoirs has its own pumping station allowing the water to be pumped into one of the main reservoirs for storage before treatment.

The Company operates 8 raw water stream abstraction points around the island. These are located at:

• Fern Valley
• Grève de Lecq
• La Hague
• Le Mourier
• Pont Marquet
• St Catherine
• Tesson
• Vallée des Vaux

The amount of useable water that can be collected from each stream varies according to the size of the catchment area, the levels of rainfall and the quality of the water in the stream.

Stream flows are generally at their highest in the autumn and winter and can reduce significantly or even dry up completely in the summer (depending on the levels of rainfall).