Jersey Water is the sole supplier of treated mains water to the Island of Jersey. In 2018, we supplied 7.2 billion litres of mains water to over 40,000 homes and businesses across the Island. Our two water treatment works feed our 580km network of mains where we supply Islanders with an average of 19.7 million litres of water per day. Jersey’s water resources are nearly all derived from rainfall dependent surface waters. We capture and store raw (untreated) water in six storage reservoirs with a capacity of 2,678ML, which is approximately 120 days of usable supply. We also capture raw water from stream catchment ponds and abstraction pumping stations across the Island. The nature of rainfall patterns in Jersey means that we generally rely on rainfall in the autumn and winter to replenish water resources and them topped up for as long as possible.