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Once treated, water enters the treated water distribution network and is either sent directly into supply or to one of five Treated Water Storage Reservoirs located in St Helier, Trinity and St Lawrence.

The treated water storage reservoirs hold sufficient water so as to enable the system to meet peak flow levels and spread the demand placed on the treatment works over the whole day (service reservoirs are refilled overnight when demand is low).

The storage reservoirs are generally located on high ground allowing water to gravitate down into the reservoirs distribution area. The storage reservoirs in St Helier, St Lawrence and Augrès feed areas located below approximately 30 metres above sea level (the south and east coasts), whilst the storage reservoir at Les Platons feeds water to the higher areas (north coast, west and south west of the Island).

The Company has recently commissioned a new high level gravity distribution system which feeds most of the high level areas on the Island. The system comprises a new 9Ml service reservoir at Les Platons
connected to a new bi-directional trunk main linking the treatment works at Augrès and Handois with the existing high level distribution network. The gravity system replaces a pumped system which used 13 booster stations to pump water from the south coast of the Island to high level areas.